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Sargent D, Amthor JS, Stinziano JR, Evans JR, Whitney SM, Bange MP, Tissue DT, Conaty WC, Sharwood RE. The importance of species-specific and temperature-sensitive parameterisation of A/C i models: A case study using cotton (Gossypium hirsutum L.) and the automated 'OptiFitACi' R-package. Plant Cell Environ 2024; 47:1701-1715. [PMID: 38294051 DOI: 10.1111/pce.14800] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/07/2022] [Revised: 11/10/2023] [Accepted: 12/15/2023] [Indexed: 02/01/2024]
Abstract
Leaf gas exchange measurements are an important tool for inferring a plant's photosynthetic biochemistry. In most cases, the responses of photosynthetic CO2 assimilation to variable intercellular CO2 concentrations (A/Ci response curves) are used to model the maximum (potential) rate of carboxylation by ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco, Vcmax) and the rate of photosynthetic electron transport at a given incident photosynthetically active radiation flux density (PAR; JPAR). The standard Farquhar-von Caemmerer-Berry model is often used with default parameters of Rubisco kinetic values and mesophyll conductance to CO2 (gm) derived from tobacco that may be inapplicable across species. To study the significance of using such parameters for other species, here we measured the temperature responses of key in vitro Rubisco catalytic properties and gm in cotton (Gossypium hirsutum cv. Sicot 71) and derived Vcmax and J2000 (JPAR at 2000 µmol m-2 s-1 PAR) from cotton A/Ci curves incrementally measured at 15°C-40°C using cotton and other species-specific sets of input parameters with our new automated fitting R package 'OptiFitACi'. Notably, parameterisation by a set of tobacco parameters produced unrealistic J2000:Vcmax ratio of <1 at 25°C, two- to three-fold higher estimates of Vcmax above 15°C, up to 2.3-fold higher estimates of J2000 and more variable estimates of Vcmax and J2000, for our cotton data compared to model parameterisation with cotton-derived values. We determined that errors arise when using a gm,25 of 2.3 mol m-2 s-1 MPa-1 or less and Rubisco CO2-affinities in 21% O2 (KC 21%O2) at 25°C outside the range of 46-63 Pa to model A/Ci responses in cotton. We show how the A/Ci modelling capabilities of 'OptiFitACi' serves as a robust, user-friendly, and flexible extension of 'plantecophys' by providing simplified temperature-sensitivity and species-specificity parameterisation capabilities to reduce variability when modelling Vcmax and J2000.
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Affiliation(s)
- Demi Sargent
- Hawkesbury Institute for the Environment, Western Sydney University, Richmond, New South Wales, Australia
- CSIRO Agriculture and Food, Narrabri, New South Wales, Australia
- Research School of Biology, Australian National University, Canberra, Australian Capital Territory, Australia
| | - Jeffrey S Amthor
- Department of Biological Sciences, Center for Ecosystem Science and Society, Northern Arizona University, Flagstaff, Arizona, USA
| | | | - John R Evans
- Research School of Biology, Australian National University, Canberra, Australian Capital Territory, Australia
| | - Spencer M Whitney
- Research School of Biology, Australian National University, Canberra, Australian Capital Territory, Australia
| | - Michael P Bange
- Cotton Seed Distributors Ltd, Wee Waa, New South Wales, Australia
| | - David T Tissue
- Hawkesbury Institute for the Environment, Western Sydney University, Richmond, New South Wales, Australia
- Global Centre for Land-Based Innovation, Hawkesbury Campus, Western Sydney University, Richmond, New South Wales, Australia
| | - Warren C Conaty
- CSIRO Agriculture and Food, Narrabri, New South Wales, Australia
| | - Robert E Sharwood
- Hawkesbury Institute for the Environment, Western Sydney University, Richmond, New South Wales, Australia
- Global Centre for Land-Based Innovation, Hawkesbury Campus, Western Sydney University, Richmond, New South Wales, Australia
- School of Science, Western Sydney University, Richmond, New South Wales, Australia
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Furbank RT, Silva-Perez V, Evans JR, Condon AG, Estavillo GM, He W, Newman S, Poiré R, Hall A, He Z. Correction: Wheat physiology predictor: predicting physiological traits in wheat from hyperspectral reflectance measurements using deep learning. Plant Methods 2024; 20:32. [PMID: 38402157 PMCID: PMC10893676 DOI: 10.1186/s13007-024-01153-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/26/2024]
Affiliation(s)
- Robert T Furbank
- ARC Centre of Excellence for Translational Photosynthesis, Research School of Biology, Australian National University, Canberra, ACT, 2601, Australia.
| | - Viridiana Silva-Perez
- Agriculture Victoria, 110 Natimuk Road, Horsham, VIC, 3400, Australia
- CSIRO Agriculture and Food, PO Box 1700, Canberra, ACT, 2601, Australia
| | - John R Evans
- ARC Centre of Excellence for Translational Photosynthesis, Research School of Biology, Australian National University, Canberra, ACT, 2601, Australia
| | - Anthony G Condon
- CSIRO Agriculture and Food, PO Box 1700, Canberra, ACT, 2601, Australia
| | | | - Wennan He
- ARC Centre of Excellence for Translational Photosynthesis, Research School of Biology, Australian National University, Canberra, ACT, 2601, Australia
| | - Saul Newman
- ARC Centre of Excellence for Translational Photosynthesis, Research School of Biology, Australian National University, Canberra, ACT, 2601, Australia
| | - Richard Poiré
- Australian Plant Phenomics Facility, Australian National University, Canberra, ACT, 2601, Australia
| | - Ashley Hall
- Department of Computer Science and Computer Engineering, La Trobe University, Bundoora, VIC, 3086, Australia
| | - Zhen He
- Department of Computer Science and Computer Engineering, La Trobe University, Bundoora, VIC, 3086, Australia
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Scafaro AP, Posch BC, Evans JR, Farquhar GD, Atkin OK. Rubisco deactivation and chloroplast electron transport rates co-limit photosynthesis above optimal leaf temperature in terrestrial plants. Nat Commun 2023; 14:2820. [PMID: 37198175 DOI: 10.1038/s41467-023-38496-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2022] [Accepted: 05/03/2023] [Indexed: 05/19/2023] Open
Abstract
Net photosynthetic CO2 assimilation rate (An) decreases at leaf temperatures above a relatively mild optimum (Topt) in most higher plants. This decline is often attributed to reduced CO2 conductance, increased CO2 loss from photorespiration and respiration, reduced chloroplast electron transport rate (J), or deactivation of Ribulose-1,5-bisphosphate Carboxylase Oxygenase (Rubisco). However, it is unclear which of these factors can best predict species independent declines in An at high temperature. We show that independent of species, and on a global scale, the observed decline in An with rising temperatures can be effectively accounted for by Rubisco deactivation and declines in J. Our finding that An declines with Rubisco deactivation and J supports a coordinated down-regulation of Rubisco and chloroplast electron transport rates to heat stress. We provide a model that, in the absence of CO2 supply limitations, can predict the response of photosynthesis to short-term increases in leaf temperature.
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Affiliation(s)
- Andrew P Scafaro
- Division of Plant Sciences, Research School of Biology, The Australian National University, Canberra, ACT, 2601, Australia.
- Centre for Entrepreneurial Agri-Technology, Gould Building, Australian National University, Canberra, 2601, Australia.
| | - Bradley C Posch
- Department of Research, Collections and Conservation, Desert Botanical Garden, Phoenix, AZ, USA
| | - John R Evans
- Division of Plant Sciences, Research School of Biology, The Australian National University, Canberra, ACT, 2601, Australia
| | - Graham D Farquhar
- Division of Plant Sciences, Research School of Biology, The Australian National University, Canberra, ACT, 2601, Australia
| | - Owen K Atkin
- Division of Plant Sciences, Research School of Biology, The Australian National University, Canberra, ACT, 2601, Australia
- Centre for Entrepreneurial Agri-Technology, Gould Building, Australian National University, Canberra, 2601, Australia
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4
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Groszmann M, De Rosa A, Chen W, Qiu J, McGaughey SA, Byrt CS, Evans JR. A high-throughput yeast approach to characterize aquaporin permeabilities: Profiling the Arabidopsis PIP aquaporin sub-family. Front Plant Sci 2023; 14:1078220. [PMID: 36760647 PMCID: PMC9907170 DOI: 10.3389/fpls.2023.1078220] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/24/2022] [Accepted: 01/04/2023] [Indexed: 06/18/2023]
Abstract
INTRODUCTION Engineering membrane transporters to achieve desired functionality is reliant on availability of experimental data informing structure-function relationships and intelligent design. Plant aquaporin (AQP) isoforms are capable of transporting diverse substrates such as signaling molecules, nutrients, metalloids, and gases, as well as water. AQPs can act as multifunctional channels and their transport function is reliant on many factors, with few studies having assessed transport function of specific isoforms for multiple substrates. METHODS High-throughput yeast assays were developed to screen for transport function of plant AQPs, providing a platform for fast data generation and cataloguing of substrate transport profiles. We applied our high-throughput growth-based yeast assays to screen all 13 Arabidopsis PIPs (AtPIPs) for transport of water and several neutral solutes: hydrogen peroxide (H2O2), boric acid (BA), and urea. Sodium (Na+) transport was assessed using elemental analysis techniques. RESULTS All AtPIPs facilitated water and H2O2 transport, although their growth phenotypes varied, and none were candidates for urea transport. For BA and Na+ transport, AtPIP2;2 and AtPIP2;7 were the top candidates, with yeast expressing these isoforms having the most pronounced toxicity response to BA exposure and accumulating the highest amounts of Na+. Linking putative AtPIP isoform substrate transport profiles with phylogenetics and gene expression data, enabled us to align possible substrate preferences with known and hypothesized biological roles of AtPIPs. DISCUSSION This testing framework enables efficient cataloguing of putative transport functionality of diverse AQPs at a scale that can help accelerate our understanding of AQP biology through big data approaches (e.g. association studies). The principles of the individual assays could be further adapted to test additional substrates. Data generated from this framework could inform future testing of AQP physiological roles, and address knowledge gaps in structure-function relationships to improve engineering efforts.
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Affiliation(s)
- Michael Groszmann
- Australian Research Council (ARC) Centre of Excellence for Translational Photosynthesis, Research School of Biology, Australian National University, Canberra, ACT, Australia
| | - Annamaria De Rosa
- Australian Research Council (ARC) Centre of Excellence for Translational Photosynthesis, Research School of Biology, Australian National University, Canberra, ACT, Australia
| | - Weihua Chen
- Australian Research Council (ARC) Centre of Excellence for Translational Photosynthesis, Research School of Biology, Australian National University, Canberra, ACT, Australia
| | - Jiaen Qiu
- Australian Research Council (ARC) Centre of Excellence in Plant Energy Biology, School of Agriculture, Food and Wine, University of Adelaide, Glen Osmond, SA, Australia
| | - Samantha A. McGaughey
- Australian Research Council (ARC) Centre of Excellence for Translational Photosynthesis, Research School of Biology, Australian National University, Canberra, ACT, Australia
| | - Caitlin S. Byrt
- Australian Research Council (ARC) Centre of Excellence for Translational Photosynthesis, Research School of Biology, Australian National University, Canberra, ACT, Australia
| | - John R. Evans
- Australian Research Council (ARC) Centre of Excellence for Translational Photosynthesis, Research School of Biology, Australian National University, Canberra, ACT, Australia
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Wu A, Brider J, Busch FA, Chen M, Chenu K, Clarke VC, Collins B, Ermakova M, Evans JR, Farquhar GD, Forster B, Furbank RT, Groszmann M, Hernandez‐Prieto MA, Long BM, Mclean G, Potgieter A, Price GD, Sharwood RE, Stower M, van Oosterom E, von Caemmerer S, Whitney SM, Hammer GL. A cross-scale analysis to understand and quantify the effects of photosynthetic enhancement on crop growth and yield across environments. Plant Cell Environ 2023; 46:23-44. [PMID: 36200623 PMCID: PMC10091820 DOI: 10.1111/pce.14453] [Citation(s) in RCA: 13] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2022] [Accepted: 09/27/2022] [Indexed: 05/29/2023]
Abstract
Photosynthetic manipulation provides new opportunities for enhancing crop yield. However, understanding and quantifying the importance of individual and multiple manipulations on the seasonal biomass growth and yield performance of target crops across variable production environments is limited. Using a state-of-the-art cross-scale model in the APSIM platform we predicted the impact of altering photosynthesis on the enzyme-limited (Ac ) and electron transport-limited (Aj ) rates, seasonal dynamics in canopy photosynthesis, biomass growth, and yield formation via large multiyear-by-location crop growth simulations. A broad list of promising strategies to improve photosynthesis for C3 wheat and C4 sorghum were simulated. In the top decile of seasonal outcomes, yield gains were predicted to be modest, ranging between 0% and 8%, depending on the manipulation and crop type. We report how photosynthetic enhancement can affect the timing and severity of water and nitrogen stress on the growing crop, resulting in nonintuitive seasonal crop dynamics and yield outcomes. We predicted that strategies enhancing Ac alone generate more consistent but smaller yield gains across all water and nitrogen environments, Aj enhancement alone generates larger gains but is undesirable in more marginal environments. Large increases in both Ac and Aj generate the highest gains across all environments. Yield outcomes of the tested manipulation strategies were predicted and compared for realistic Australian wheat and sorghum production. This study uniquely unpacks complex cross-scale interactions between photosynthesis and seasonal crop dynamics and improves understanding and quantification of the potential impact of photosynthesis traits (or lack of it) for crop improvement research.
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Affiliation(s)
- Alex Wu
- ARC Centre of Excellence for Translational Photosynthesis, Centre for Crop Science, Queensland Alliance for Agriculture and Food InnovationThe University of QueenslandBrisbaneQueenslandAustralia
| | - Jason Brider
- ARC Centre of Excellence for Translational Photosynthesis, Centre for Crop Science, Queensland Alliance for Agriculture and Food InnovationThe University of QueenslandBrisbaneQueenslandAustralia
| | - Florian A. Busch
- ARC Centre of Excellence for Translational Photosynthesis, Division of Plant Science, Research School of BiologyThe Australian National UniversityCanberraAustralian Capital TerritoryAustralia
- School of BiosciencesUniversity of BirminghamBirminghamUK
- Birmingham Institute of Forest ResearchUniversity of BirminghamBirminghamUK
| | - Min Chen
- ARC Centre of Excellence for Translational Photosynthesis, School of Life and Environmental Science, Faculty of ScienceUniversity of SydneySydneyNew South WalesAustralia
| | - Karine Chenu
- ARC Centre of Excellence for Translational Photosynthesis, Centre for Crop Science, Queensland Alliance for Agriculture and Food InnovationThe University of QueenslandBrisbaneQueenslandAustralia
| | - Victoria C. Clarke
- ARC Centre of Excellence for Translational Photosynthesis, Division of Plant Science, Research School of BiologyThe Australian National UniversityCanberraAustralian Capital TerritoryAustralia
| | - Brian Collins
- College of Science and EngineeringJames Cook UniversityTownsvilleQueenslandAustralia
| | - Maria Ermakova
- ARC Centre of Excellence for Translational Photosynthesis, Division of Plant Science, Research School of BiologyThe Australian National UniversityCanberraAustralian Capital TerritoryAustralia
| | - John R. Evans
- ARC Centre of Excellence for Translational Photosynthesis, Division of Plant Science, Research School of BiologyThe Australian National UniversityCanberraAustralian Capital TerritoryAustralia
| | - Graham D. Farquhar
- ARC Centre of Excellence for Translational Photosynthesis, Division of Plant Science, Research School of BiologyThe Australian National UniversityCanberraAustralian Capital TerritoryAustralia
| | - Britta Forster
- ARC Centre of Excellence for Translational Photosynthesis, Division of Plant Science, Research School of BiologyThe Australian National UniversityCanberraAustralian Capital TerritoryAustralia
| | - Robert T. Furbank
- ARC Centre of Excellence for Translational Photosynthesis, Division of Plant Science, Research School of BiologyThe Australian National UniversityCanberraAustralian Capital TerritoryAustralia
| | - Michael Groszmann
- ARC Centre of Excellence for Translational Photosynthesis, Division of Plant Science, Research School of BiologyThe Australian National UniversityCanberraAustralian Capital TerritoryAustralia
| | - Miguel A. Hernandez‐Prieto
- ARC Centre of Excellence for Translational Photosynthesis, School of Life and Environmental Science, Faculty of ScienceUniversity of SydneySydneyNew South WalesAustralia
| | - Benedict M. Long
- ARC Centre of Excellence for Translational Photosynthesis, Division of Plant Science, Research School of BiologyThe Australian National UniversityCanberraAustralian Capital TerritoryAustralia
| | - Greg Mclean
- ARC Centre of Excellence for Translational Photosynthesis, Centre for Crop Science, Queensland Alliance for Agriculture and Food InnovationThe University of QueenslandBrisbaneQueenslandAustralia
| | - Andries Potgieter
- ARC Centre of Excellence for Translational Photosynthesis, Centre for Crop Science, Queensland Alliance for Agriculture and Food InnovationThe University of QueenslandBrisbaneQueenslandAustralia
| | - G. Dean Price
- ARC Centre of Excellence for Translational Photosynthesis, Division of Plant Science, Research School of BiologyThe Australian National UniversityCanberraAustralian Capital TerritoryAustralia
| | - Robert E. Sharwood
- Hawkesbury Institute for the EnvironmentWestern Sydney UniversityRichmondNew South WalesAustralia
| | - Michael Stower
- ARC Centre of Excellence for Translational Photosynthesis, Centre for Crop Science, Queensland Alliance for Agriculture and Food InnovationThe University of QueenslandBrisbaneQueenslandAustralia
| | - Erik van Oosterom
- ARC Centre of Excellence for Translational Photosynthesis, Centre for Crop Science, Queensland Alliance for Agriculture and Food InnovationThe University of QueenslandBrisbaneQueenslandAustralia
| | - Susanne von Caemmerer
- ARC Centre of Excellence for Translational Photosynthesis, Division of Plant Science, Research School of BiologyThe Australian National UniversityCanberraAustralian Capital TerritoryAustralia
| | - Spencer M. Whitney
- ARC Centre of Excellence for Translational Photosynthesis, Division of Plant Science, Research School of BiologyThe Australian National UniversityCanberraAustralian Capital TerritoryAustralia
| | - Graeme L. Hammer
- ARC Centre of Excellence for Translational Photosynthesis, Centre for Crop Science, Queensland Alliance for Agriculture and Food InnovationThe University of QueenslandBrisbaneQueenslandAustralia
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Garcia A, Gaju O, Bowerman AF, Buck SA, Evans JR, Furbank RT, Gilliham M, Millar AH, Pogson BJ, Reynolds MP, Ruan Y, Taylor NL, Tyerman SD, Atkin OK. Enhancing crop yields through improvements in the efficiency of photosynthesis and respiration. New Phytol 2023; 237:60-77. [PMID: 36251512 PMCID: PMC10100352 DOI: 10.1111/nph.18545] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2022] [Accepted: 09/15/2022] [Indexed: 06/06/2023]
Abstract
The rate with which crop yields per hectare increase each year is plateauing at the same time that human population growth and other factors increase food demand. Increasing yield potential (Y p ) of crops is vital to address these challenges. In this review, we explore a component ofY p that has yet to be optimised - that being improvements in the efficiency with which light energy is converted into biomass (ε c ) via modifications to CO2 fixed per unit quantum of light (α), efficiency of respiratory ATP production (ε prod ) and efficiency of ATP use (ε use ). For α, targets include changes in photoprotective machinery, ribulose bisphosphate carboxylase/oxygenase kinetics and photorespiratory pathways. There is also potential forε prod to be increased via targeted changes to the expression of the alternative oxidase and mitochondrial uncoupling pathways. Similarly, there are possibilities to improveε use via changes to the ATP costs of phloem loading, nutrient uptake, futile cycles and/or protein/membrane turnover. Recently developed high-throughput measurements of respiration can serve as a proxy for the cumulative energy cost of these processes. There are thus exciting opportunities to use our growing knowledge of factors influencing the efficiency of photosynthesis and respiration to create a step-change in yield potential of globally important crops.
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Affiliation(s)
- Andres Garcia
- ARC Centre of Excellence in Plant Energy Biology, Research School of BiologyThe Australian National UniversityCanberraACT2601Australia
- Division of Plant Sciences, Research School of BiologyAustralian National UniversityCanberraACT2601Australia
| | - Oorbessy Gaju
- ARC Centre of Excellence in Plant Energy Biology, Research School of BiologyThe Australian National UniversityCanberraACT2601Australia
- College of Science, Lincoln Institute for Agri‐Food TechnologyUniversity of LincolnLincolnshireLN2 2LGUK
| | - Andrew F. Bowerman
- ARC Centre of Excellence in Plant Energy Biology, Research School of BiologyThe Australian National UniversityCanberraACT2601Australia
- Division of Plant Sciences, Research School of BiologyAustralian National UniversityCanberraACT2601Australia
| | - Sally A. Buck
- ARC Centre of Excellence in Plant Energy Biology, Research School of BiologyThe Australian National UniversityCanberraACT2601Australia
- Division of Plant Sciences, Research School of BiologyAustralian National UniversityCanberraACT2601Australia
| | - John R. Evans
- Division of Plant Sciences, Research School of BiologyAustralian National UniversityCanberraACT2601Australia
- ARC Centre of Excellence for Translational Photosynthesis, Research School of BiologyThe Australian National UniversityCanberraACT2601Australia
| | - Robert T. Furbank
- Division of Plant Sciences, Research School of BiologyAustralian National UniversityCanberraACT2601Australia
- ARC Centre of Excellence for Translational Photosynthesis, Research School of BiologyThe Australian National UniversityCanberraACT2601Australia
| | - Matthew Gilliham
- ARC Centre of Excellence in Plant Energy Biology, School of Agriculture, Food and Wine & Waite Research InstituteUniversity of AdelaideGlen OsmondSA5064Australia
| | - A. Harvey Millar
- ARC Centre of Excellence in Plant Energy Biology, School of Molecular Sciences & Institute of AgricultureThe University of Western AustraliaCrawleyWA6009Australia
| | - Barry J. Pogson
- ARC Centre of Excellence in Plant Energy Biology, Research School of BiologyThe Australian National UniversityCanberraACT2601Australia
- Division of Plant Sciences, Research School of BiologyAustralian National UniversityCanberraACT2601Australia
| | - Matthew P. Reynolds
- International Maize and Wheat Improvement Center (CIMMYT)Km. 45, Carretera Mexico, El BatanTexcoco56237Mexico
| | - Yong‐Ling Ruan
- Division of Plant Sciences, Research School of BiologyAustralian National UniversityCanberraACT2601Australia
| | - Nicolas L. Taylor
- ARC Centre of Excellence in Plant Energy Biology, School of Molecular Sciences & Institute of AgricultureThe University of Western AustraliaCrawleyWA6009Australia
| | - Stephen D. Tyerman
- ARC Centre of Excellence in Plant Energy Biology, School of Agriculture, Food and Wine & Waite Research InstituteUniversity of AdelaideGlen OsmondSA5064Australia
| | - Owen K. Atkin
- ARC Centre of Excellence in Plant Energy Biology, Research School of BiologyThe Australian National UniversityCanberraACT2601Australia
- Division of Plant Sciences, Research School of BiologyAustralian National UniversityCanberraACT2601Australia
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7
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Knauer J, Cuntz M, Evans JR, Niinemets Ü, Tosens T, Veromann-Jürgenson LL, Werner C, Zaehle S. Contrasting anatomical and biochemical controls on mesophyll conductance across plant functional types. New Phytol 2022. [PMID: 35801854 DOI: 10.6084/m9.figshare.19681410.v1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
Mesophyll conductance (gm ) limits photosynthesis by restricting CO2 diffusion between the substomatal cavities and chloroplasts. Although it is known that gm is determined by both leaf anatomical and biochemical traits, their relative contribution across plant functional types (PFTs) is still unclear. We compiled a dataset of gm measurements and concomitant leaf traits in unstressed plants comprising 563 studies and 617 species from all major PFTs. We investigated to what extent gm limits photosynthesis across PFTs, how gm relates to structural, anatomical, biochemical, and physiological leaf properties, and whether these relationships differ among PFTs. We found that gm imposes a significant limitation to photosynthesis in all C3 PFTs, ranging from 10-30% in most herbaceous annuals to 25-50% in woody evergreens. Anatomical leaf traits explained a significant proportion of the variation in gm (R2 > 0.3) in all PFTs except annual herbs, in which gm is more strongly related to biochemical factors associated with leaf nitrogen and potassium content. Our results underline the need to elucidate mechanisms underlying the global variability of gm . We emphasise the underestimated potential of gm for improving photosynthesis in crops and identify modifications in leaf biochemistry as the most promising pathway for increasing gm in these species.
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Affiliation(s)
- Jürgen Knauer
- Hawkesbury Institute for the Environment, Western Sydney University, Penrith, NSW, 2751, Australia
- Climate Science Centre, CSIRO Oceans and Atmosphere, Canberra, ACT, 2601, Australia
- Max Planck Institute for Biogeochemistry, 07745, Jena, Germany
| | - Matthias Cuntz
- AgroParisTech, UMR Silva, INRAE, Université de Lorraine, 54000, Nancy, France
| | - John R Evans
- ARC Centre of Excellence for Translational Photosynthesis, Research School of Biology, The Australian National University, Canberra, ACT, 2601, Australia
| | - Ülo Niinemets
- Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, 51006, Tartu, Estonia
| | - Tiina Tosens
- Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, 51006, Tartu, Estonia
| | | | - Christiane Werner
- Ecosystem Physiology, University of Freiburg, 79110, Freiburg, Germany
| | - Sönke Zaehle
- Max Planck Institute for Biogeochemistry, 07745, Jena, Germany
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8
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Knauer J, Cuntz M, Evans JR, Niinemets Ü, Tosens T, Veromann‐Jürgenson L, Werner C, Zaehle S. Contrasting anatomical and biochemical controls on mesophyll conductance across plant functional types. New Phytol 2022; 236:357-368. [PMID: 35801854 PMCID: PMC9804998 DOI: 10.1111/nph.18363] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2022] [Accepted: 06/30/2022] [Indexed: 06/06/2023]
Abstract
Mesophyll conductance (gm ) limits photosynthesis by restricting CO2 diffusion between the substomatal cavities and chloroplasts. Although it is known that gm is determined by both leaf anatomical and biochemical traits, their relative contribution across plant functional types (PFTs) is still unclear. We compiled a dataset of gm measurements and concomitant leaf traits in unstressed plants comprising 563 studies and 617 species from all major PFTs. We investigated to what extent gm limits photosynthesis across PFTs, how gm relates to structural, anatomical, biochemical, and physiological leaf properties, and whether these relationships differ among PFTs. We found that gm imposes a significant limitation to photosynthesis in all C3 PFTs, ranging from 10-30% in most herbaceous annuals to 25-50% in woody evergreens. Anatomical leaf traits explained a significant proportion of the variation in gm (R2 > 0.3) in all PFTs except annual herbs, in which gm is more strongly related to biochemical factors associated with leaf nitrogen and potassium content. Our results underline the need to elucidate mechanisms underlying the global variability of gm . We emphasise the underestimated potential of gm for improving photosynthesis in crops and identify modifications in leaf biochemistry as the most promising pathway for increasing gm in these species.
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Affiliation(s)
- Jürgen Knauer
- Hawkesbury Institute for the EnvironmentWestern Sydney UniversityPenrithNSW2751Australia
- Climate Science CentreCSIRO Oceans and AtmosphereCanberraACT2601Australia
- Max Planck Institute for Biogeochemistry07745JenaGermany
| | - Matthias Cuntz
- AgroParisTech, UMR SilvaINRAE, Université de Lorraine54000NancyFrance
| | - John R. Evans
- ARC Centre of Excellence for Translational PhotosynthesisResearch School of BiologyThe Australian National UniversityCanberraACT2601Australia
| | - Ülo Niinemets
- Institute of Agricultural and Environmental SciencesEstonian University of Life Sciences51006TartuEstonia
| | - Tiina Tosens
- Institute of Agricultural and Environmental SciencesEstonian University of Life Sciences51006TartuEstonia
| | | | | | - Sönke Zaehle
- Max Planck Institute for Biogeochemistry07745JenaGermany
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9
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Spicer LJ, Evans JR, Schreiber NB. Hormone regulation of thrombospondin-1 mRNA in porcine granulosa cells in vitro. Anim Reprod Sci 2022; 244:107048. [PMID: 35914333 PMCID: PMC10867812 DOI: 10.1016/j.anireprosci.2022.107048] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2022] [Revised: 06/21/2022] [Accepted: 07/25/2022] [Indexed: 11/26/2022]
Abstract
Thrombospondin-1 (THBS1) is involved in the process of angiogenesis and is down-regulated by insulin-like growth factor 1 (IGF1) in porcine granulosa cells (GC), but what other hormones regulate GC THBS1 and its role in follicular growth is unclear. Thus, six experiments were conducted to determine the influence of other hormones on THBS1 gene expression in porcine GC, and to determine if THBS1 mRNA changes during follicular development. For Exp. 1-5, small (1-5 mm) follicles from ovaries of abattoir gilts were aspirated, GC collected and treated with FSH, IGF1, fibroblast growth factor 9 (FGF9), Sonic hedgehog (SHH), estradiol, cortisol, and/or prostaglandin E2 (PGE2). FSH, IGF1 and FGF9 each decreased (P < 0.05) THBS1 mRNA abundance. Alone, PGE2 increased (P < 0.05) THBS1 mRNA abundance. PGE2 significantly attenuated the FSH-induced inhibition of THBS1 mRNA expression. Estradiol, cortisol, and SHH had no effect on THBS1 mRNA abundance. In Exp. 6, small (1-3 mm), medium (4-6 mm) and large (7-14 mm) follicles were aspirated to measure abundance of THBS1 mRNA in GC which did not differ (P > 0.10) between small and medium-sized follicles but was threefold greater (P < 0.05) in large compared to small or medium follicles. We hypothesize that the inhibitory effects of FSH, IGF1 and FGF9 on the antiangiogenic gene THBS1 could contribute to promoting angiogenesis in the developing follicle, while stimulation of THBS1 mRNA by PGE2 may help reduce angiogenesis during the preovulatory period when PGE2 and THBS1 mRNA are at their greatest levels.
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Affiliation(s)
- Leon J Spicer
- Department of Animal and Food Sciences, Oklahoma State University, Stillwater, OK 74078, USA.
| | - John R Evans
- Department of Animal and Food Sciences, Oklahoma State University, Stillwater, OK 74078, USA
| | - Nicole B Schreiber
- Department of Animal and Food Sciences, Oklahoma State University, Stillwater, OK 74078, USA
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10
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Clarke VC, De Rosa A, Massey B, George AM, Evans JR, von Caemmerer S, Groszmann M. Mesophyll conductance is unaffected by expression of Arabidopsis PIP1 aquaporins in the plasmalemma of Nicotiana. J Exp Bot 2022; 73:3625-3636. [PMID: 35184158 PMCID: PMC9162178 DOI: 10.1093/jxb/erac065] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2021] [Accepted: 02/18/2022] [Indexed: 05/22/2023]
Abstract
In plants with C3 photosynthesis, increasing the diffusion conductance for CO2 from the substomatal cavity to chloroplast stroma (mesophyll conductance) can improve the efficiencies of both CO2 assimilation and photosynthetic water use. In the diffusion pathway from substomatal cavity to chloroplast stroma, the plasmalemma and chloroplast envelope membranes impose a considerable barrier to CO2 diffusion, limiting photosynthetic efficiency. In an attempt to improve membrane permeability to CO2, and increase photosynthesis in tobacco, we generated transgenic lines in Nicotiana tabacum L. cv Petite Havana carrying either the Arabidopsis PIP1;2 (AtPIP1;2) or PIP1;4 (AtPIP1;4) gene driven by the constitutive dual 2x35S CMV promoter. From a collection of independent T0 transgenics, two T2 lines from each gene were characterized, with western blots confirming increased total aquaporin protein abundance in the AtPIP1;2 tobacco lines. Transient expression of AtPIP1;2-mGFP6 and AtPIP1;4-mGFP6 fusions in Nicotiana benthamiana identified that both AtPIP1;2 and AtPIP1;4 localize to the plasmalemma. Despite achieving ectopic production and correct localization, gas exchange measurements combined with carbon isotope discrimination measurements detected no increase in mesophyll conductance or CO2 assimilation rate in the tobacco lines expressing AtPIP. We discuss the complexities associated with trying to enhance gm through modified aquaporin activity.
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Affiliation(s)
- Victoria C Clarke
- Division of Plant Sciences, Research School of Biology, The Australian National University, Acton, Australian Capital Territory 2601, Australia
| | - Annamaria De Rosa
- Division of Plant Sciences, Research School of Biology, The Australian National University, Acton, Australian Capital Territory 2601, Australia
| | - Baxter Massey
- Division of Plant Sciences, Research School of Biology, The Australian National University, Acton, Australian Capital Territory 2601, Australia
| | - Aleu Mani George
- Division of Plant Sciences, Research School of Biology, The Australian National University, Acton, Australian Capital Territory 2601, Australia
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11
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Sales CRG, Molero G, Evans JR, Taylor SH, Joynson R, Furbank RT, Hall A, Carmo-Silva E. Phenotypic variation in photosynthetic traits in wheat grown under field versus glasshouse conditions. J Exp Bot 2022; 73:3221-3237. [PMID: 35271722 PMCID: PMC9126738 DOI: 10.1093/jxb/erac096] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/05/2021] [Accepted: 03/08/2022] [Indexed: 05/19/2023]
Abstract
Recognition of the untapped potential of photosynthesis to improve crop yields has spurred research to identify targets for breeding. The CO2-fixing enzyme Rubisco is characterized by a number of inefficiencies, and frequently limits carbon assimilation at the top of the canopy, representing a clear target for wheat improvement. Two bread wheat lines with similar genetic backgrounds and contrasting in vivo maximum carboxylation activity of Rubisco per unit leaf nitrogen (Vc,max,25/Narea) determined using high-throughput phenotyping methods were selected for detailed study from a panel of 80 spring wheat lines. Detailed phenotyping of photosynthetic traits in the two lines using glasshouse-grown plants showed no difference in Vc,max,25/Narea determined directly via in vivo and in vitro methods. Detailed phenotyping of glasshouse-grown plants of the 80 wheat lines also showed no correlation between photosynthetic traits measured via high-throughput phenotyping of field-grown plants. Our findings suggest that the complex interplay between traits determining crop productivity and the dynamic environments experienced by field-grown plants needs to be considered in designing strategies for effective wheat crop yield improvement when breeding for particular environments.
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Affiliation(s)
- Cristina R G Sales
- Lancaster Environment Centre, Lancaster University, Library Avenue, Lancaster LA1 4YQ, UK
- Department of Plant Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EA, UK
- Correspondence: or
| | - Gemma Molero
- International Maize and Wheat Improvement Centre (CIMMYT), Int. Apdo. Postal 6-641, 06600 Mexico, DF, Mexico
- KWS Momont Recherche, 7 rue de Martinval, 59246 Mons-en-Pévèle, France
| | - John R Evans
- ARC Centre of Excellence for Translational Photosynthesis, Research School of Biology, The Australian National University, Canberra ACT 2601, Australia
| | - Samuel H Taylor
- Lancaster Environment Centre, Lancaster University, Library Avenue, Lancaster LA1 4YQ, UK
| | - Ryan Joynson
- Organisms and Ecosystems, Earlham Institute, Norwich Research Park, Norwich NR4 7UG, UK
- Limagrain Europe, CS 3911, 63720 Chappes, France
| | - Robert T Furbank
- ARC Centre of Excellence for Translational Photosynthesis, Research School of Biology, The Australian National University, Canberra ACT 2601, Australia
| | - Anthony Hall
- Organisms and Ecosystems, Earlham Institute, Norwich Research Park, Norwich NR4 7UG, UK
| | - Elizabete Carmo-Silva
- Lancaster Environment Centre, Lancaster University, Library Avenue, Lancaster LA1 4YQ, UK
- Correspondence: or
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12
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Furbank RT, Silva-Perez V, Evans JR, Condon AG, Estavillo GM, He W, Newman S, Poiré R, Hall A, He Z. Wheat physiology predictor: predicting physiological traits in wheat from hyperspectral reflectance measurements using deep learning. Plant Methods 2021; 17:108. [PMID: 34666801 PMCID: PMC8527791 DOI: 10.1186/s13007-021-00806-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2021] [Accepted: 10/03/2021] [Indexed: 05/06/2023]
Abstract
BACKGROUND The need for rapid in-field measurement of key traits contributing to yield over many thousands of genotypes is a major roadblock in crop breeding. Recently, leaf hyperspectral reflectance data has been used to train machine learning models using partial least squares regression (PLSR) to rapidly predict genetic variation in photosynthetic and leaf traits across wheat populations, among other species. However, the application of published PLSR spectral models is limited by a fixed spectral wavelength range as input and the requirement of separate custom-built models for each trait and wavelength range. In addition, the use of reflectance spectra from the short-wave infrared region requires expensive multiple detector spectrometers. The ability to train a model that can accommodate input from different spectral ranges would potentially make such models extensible to more affordable sensors. Here we compare the accuracy of prediction of PLSR with various deep learning approaches and an ensemble model, each trained and tested using previously published data sets. RESULTS We demonstrate that the accuracy of PLSR to predict photosynthetic and related leaf traits in wheat can be improved with deep learning-based and ensemble models without overfitting. Additionally, these models can be flexibly applied across spectral ranges without significantly compromising accuracy. CONCLUSION The method reported provides an improved prediction of wheat leaf and photosynthetic traits from leaf hyperspectral reflectance and do not require a full range, high cost leaf spectrometer. We provide a web service for deploying these algorithms to predict physiological traits in wheat from a variety of spectral data sets, with important implications for wheat yield prediction and crop breeding.
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Affiliation(s)
- Robert T Furbank
- ARC Centre of Excellence for Translational Photosynthesis, Research School of Biology. Australian National University, Canberra, ACT, 2601, Australia.
| | - Viridiana Silva-Perez
- Agriculture Victoria, 110 Natimuk Road, Horsham, VIC, 3400, Australia
- CSIRO Agriculture and Food, PO Box 1700, Canberra, ACT, 2601, Australia
| | - John R Evans
- ARC Centre of Excellence for Translational Photosynthesis, Research School of Biology. Australian National University, Canberra, ACT, 2601, Australia
| | - Anthony G Condon
- CSIRO Agriculture and Food, PO Box 1700, Canberra, ACT, 2601, Australia
| | | | - Wennan He
- ARC Centre of Excellence for Translational Photosynthesis, Research School of Biology. Australian National University, Canberra, ACT, 2601, Australia
| | - Saul Newman
- ARC Centre of Excellence for Translational Photosynthesis, Research School of Biology. Australian National University, Canberra, ACT, 2601, Australia
| | - Richard Poiré
- Australian Plant Phenomics Facility, Australian National University, Canberra, ACT, 2601, Australia
| | - Ashley Hall
- Department of Computer Science and Computer Engineering, La Trobe University, Bundoora, VIC, 3086, Australia
| | - Zhen He
- Department of Computer Science and Computer Engineering, La Trobe University, Bundoora, VIC, 3086, Australia
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13
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Falster D, Gallagher R, Wenk EH, Wright IJ, Indiarto D, Andrew SC, Baxter C, Lawson J, Allen S, Fuchs A, Monro A, Kar F, Adams MA, Ahrens CW, Alfonzetti M, Angevin T, Apgaua DMG, Arndt S, Atkin OK, Atkinson J, Auld T, Baker A, von Balthazar M, Bean A, Blackman CJ, Bloomfield K, Bowman DMJS, Bragg J, Brodribb TJ, Buckton G, Burrows G, Caldwell E, Camac J, Carpenter R, Catford JA, Cawthray GR, Cernusak LA, Chandler G, Chapman AR, Cheal D, Cheesman AW, Chen SC, Choat B, Clinton B, Clode PL, Coleman H, Cornwell WK, Cosgrove M, Crisp M, Cross E, Crous KY, Cunningham S, Curran T, Curtis E, Daws MI, DeGabriel JL, Denton MD, Dong N, Du P, Duan H, Duncan DH, Duncan RP, Duretto M, Dwyer JM, Edwards C, Esperon-Rodriguez M, Evans JR, Everingham SE, Farrell C, Firn J, Fonseca CR, French BJ, Frood D, Funk JL, Geange SR, Ghannoum O, Gleason SM, Gosper CR, Gray E, Groom PK, Grootemaat S, Gross C, Guerin G, Guja L, Hahs AK, Harrison MT, Hayes PE, Henery M, Hochuli D, Howell J, Huang G, Hughes L, Huisman J, Ilic J, Jagdish A, Jin D, Jordan G, Jurado E, Kanowski J, Kasel S, Kellermann J, Kenny B, Kohout M, Kooyman RM, Kotowska MM, Lai HR, Laliberté E, Lambers H, Lamont BB, Lanfear R, van Langevelde F, Laughlin DC, Laugier-Kitchener BA, Laurance S, Lehmann CER, Leigh A, Leishman MR, Lenz T, Lepschi B, Lewis JD, Lim F, Liu U, Lord J, Lusk CH, Macinnis-Ng C, McPherson H, Magallón S, Manea A, López-Martinez A, Mayfield M, McCarthy JK, Meers T, van der Merwe M, Metcalfe DJ, Milberg P, Mokany K, Moles AT, Moore BD, Moore N, Morgan JW, Morris W, Muir A, Munroe S, Nicholson Á, Nicolle D, Nicotra AB, Niinemets Ü, North T, O'Reilly-Nugent A, O'Sullivan OS, Oberle B, Onoda Y, Ooi MKJ, Osborne CP, Paczkowska G, Pekin B, Guilherme Pereira C, Pickering C, Pickup M, Pollock LJ, Poot P, Powell JR, Power SA, Prentice IC, Prior L, Prober SM, Read J, Reynolds V, Richards AE, Richardson B, Roderick ML, Rosell JA, Rossetto M, Rye B, Rymer PD, Sams MA, Sanson G, Sauquet H, Schmidt S, Schönenberger J, Schulze ED, Sendall K, Sinclair S, Smith B, Smith R, Soper F, Sparrow B, Standish RJ, Staples TL, Stephens R, Szota C, Taseski G, Tasker E, Thomas F, Tissue DT, Tjoelker MG, Tng DYP, de Tombeur F, Tomlinson K, Turner NC, Veneklaas EJ, Venn S, Vesk P, Vlasveld C, Vorontsova MS, Warren CA, Warwick N, Weerasinghe LK, Wells J, Westoby M, White M, Williams NSG, Wills J, Wilson PG, Yates C, Zanne AE, Zemunik G, Ziemińska K. AusTraits, a curated plant trait database for the Australian flora. Sci Data 2021; 8:254. [PMID: 34593819 PMCID: PMC8484355 DOI: 10.1038/s41597-021-01006-6] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2020] [Accepted: 08/05/2021] [Indexed: 02/08/2023] Open
Abstract
We introduce the AusTraits database - a compilation of values of plant traits for taxa in the Australian flora (hereafter AusTraits). AusTraits synthesises data on 448 traits across 28,640 taxa from field campaigns, published literature, taxonomic monographs, and individual taxon descriptions. Traits vary in scope from physiological measures of performance (e.g. photosynthetic gas exchange, water-use efficiency) to morphological attributes (e.g. leaf area, seed mass, plant height) which link to aspects of ecological variation. AusTraits contains curated and harmonised individual- and species-level measurements coupled to, where available, contextual information on site properties and experimental conditions. This article provides information on version 3.0.2 of AusTraits which contains data for 997,808 trait-by-taxon combinations. We envision AusTraits as an ongoing collaborative initiative for easily archiving and sharing trait data, which also provides a template for other national or regional initiatives globally to fill persistent gaps in trait knowledge.
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Affiliation(s)
- Daniel Falster
- Evolution & Ecology Research Centre, School of Biological, Earth, and Environmental Sciences, UNSW Sydney, Sydney, Australia.
| | - Rachael Gallagher
- Department of Biological Sciences, Macquarie University, Sydney, Australia
- Hawkesbury Institute for the Environment, Western Sydney University, Sydney, Australia
| | - Elizabeth H Wenk
- Evolution & Ecology Research Centre, School of Biological, Earth, and Environmental Sciences, UNSW Sydney, Sydney, Australia
| | - Ian J Wright
- Department of Biological Sciences, Macquarie University, Sydney, Australia
| | - Dony Indiarto
- Evolution & Ecology Research Centre, School of Biological, Earth, and Environmental Sciences, UNSW Sydney, Sydney, Australia
| | | | - Caitlan Baxter
- Evolution & Ecology Research Centre, School of Biological, Earth, and Environmental Sciences, UNSW Sydney, Sydney, Australia
| | - James Lawson
- NSW Department of Primary Industries, Orange, Australia
| | - Stuart Allen
- Department of Biological Sciences, Macquarie University, Sydney, Australia
| | - Anne Fuchs
- Centre for Australian National Biodiversity Research (a joint venture between Parks Australia and CSIRO), Canberra, ACT, Australia
| | - Anna Monro
- Centre for Australian National Biodiversity Research (a joint venture between Parks Australia and CSIRO), Canberra, ACT, Australia
| | - Fonti Kar
- Evolution & Ecology Research Centre, School of Biological, Earth, and Environmental Sciences, UNSW Sydney, Sydney, Australia
| | - Mark A Adams
- Swinburne University of Technology, Hawthorn, Australia
| | - Collin W Ahrens
- Hawkesbury Institute for the Environment, Western Sydney University, Sydney, Australia
| | - Matthew Alfonzetti
- Department of Biological Sciences, Macquarie University, Sydney, Australia
| | | | - Deborah M G Apgaua
- Centre for Rainforest Studies, School for Field Studies, Yungaburra, Queensland, 4872, Australia
| | | | - Owen K Atkin
- The Australian National University, Canberra, Australia
| | - Joe Atkinson
- Evolution & Ecology Research Centre, School of Biological, Earth, and Environmental Sciences, UNSW Sydney, Sydney, Australia
| | - Tony Auld
- NSW Department of Planning Industry and Environment, Parramatta, Australia
| | | | - Maria von Balthazar
- Department of Botany and Biodiversity Research, University of Vienna, Vienna, Austria
| | | | | | | | | | - Jason Bragg
- Research Centre for Ecosystem Resilience, Australian Institute of Botanical Science, Royal Botanic Gardens and Domain Trust, Sydney, Australia
| | | | | | | | | | - James Camac
- Centre of Excellence for Biosecurity Risk Analysis, The University of Melbourne, Melbourne, Australia
| | | | | | | | - Lucas A Cernusak
- College of Science and Engineering, James Cook University, Cairns, QLD, Australia
| | | | - Alex R Chapman
- Western Australian Herbarium, Keiran McNamara Conservation Science Centre, Department of Biodiversity, Conservation and Attractions, Western Australia, Kensington, Australia
| | - David Cheal
- Centre for Environmental Management, School of Health & Life Sciences, Federation University, Mount Helen, Australia
| | | | - Si-Chong Chen
- Royal Botanic Gardens, Richmond, Kew, United Kingdom
| | - Brendan Choat
- Hawkesbury Institute for the Environment, Western Sydney University, Sydney, Australia
| | - Brook Clinton
- Centre for Australian National Biodiversity Research (a joint venture between Parks Australia and CSIRO), Canberra, ACT, Australia
| | - Peta L Clode
- University of Western Australia, Crawley, Australia
| | - Helen Coleman
- Western Australian Herbarium, Keiran McNamara Conservation Science Centre, Department of Biodiversity, Conservation and Attractions, Western Australia, Kensington, Australia
| | - William K Cornwell
- Evolution & Ecology Research Centre, School of Biological, Earth, and Environmental Sciences, UNSW Sydney, Sydney, Australia
| | | | - Michael Crisp
- The Australian National University, Canberra, Australia
| | - Erika Cross
- Charles Sturt University, Bathurst, Australia
| | - Kristine Y Crous
- Hawkesbury Institute for the Environment, Western Sydney University, Sydney, Australia
| | - Saul Cunningham
- Fenner School of Environment and Society, The Australian National University, Canberra, Australia
| | | | - Ellen Curtis
- University of Technology Sydney, Sydney, Australia
| | - Matthew I Daws
- Environment Department, Alcoa of Australia, Huntly, Western Australia, Australia
| | - Jane L DeGabriel
- School of Marine and Tropical Biology, James Cook University, Douglas, Australia
| | - Matthew D Denton
- School of Agriculture, Food and Wine, University of Adelaide, Adelaide, Australia
| | - Ning Dong
- Department of Biological Sciences, Macquarie University, Sydney, Australia
| | | | - Honglang Duan
- Institute for Forest Resources & Environment of Guizhou, Guizhou University, Guiyang, China
| | | | - Richard P Duncan
- Institute for Applied Ecology, University of Canberra, ACT, 2617, Canberra, Australia
| | - Marco Duretto
- National Herbarium of New South Wales, Australian Institute of Botanical Science, Royal Botanic Gardens and Domain Trust, Sydney, Australia
| | - John M Dwyer
- School of Biological Sciences, The University of Queensland, St Lucia, Australia
| | | | | | - John R Evans
- The Australian National University, Canberra, Australia
| | - Susan E Everingham
- Evolution & Ecology Research Centre, School of Biological, Earth, and Environmental Sciences, UNSW Sydney, Sydney, Australia
| | | | - Jennifer Firn
- Queensland University of Technology, Brisbane, Australia
| | - Carlos Roberto Fonseca
- Departamento de Ecologia, Universidade Federal do Rio Grande do Norte, Natal, Natal - RN, Brazil
| | | | - Doug Frood
- Pathways Bushland and Environment Consultancy, Sydney, Australia
| | - Jennifer L Funk
- Department of Plant Sciences, University of California, Davis, USA
| | | | - Oula Ghannoum
- Hawkesbury Institute for the Environment, Western Sydney University, Sydney, Australia
| | | | - Carl R Gosper
- Biodiversity and Conservation Science, Department of Biodiversity, Conservation and Attractions, Kensington, WA, Australia
| | - Emma Gray
- Department of Biological Sciences, Macquarie University, Sydney, Australia
| | | | - Saskia Grootemaat
- Evolution & Ecology Research Centre, School of Biological, Earth, and Environmental Sciences, UNSW Sydney, Sydney, Australia
| | | | - Greg Guerin
- Terrestrial Ecosystem Research Network, The School of Biological Sciences, The University of Adelaide, Adelaide, SA, 5005, Australia
| | - Lydia Guja
- Centre for Australian National Biodiversity Research (a joint venture between Parks Australia and CSIRO), Canberra, ACT, Australia
| | - Amy K Hahs
- School of Ecosystem and Forest Sciences, The University of Melbourne, Melbourne, Australia
| | | | | | - Martin Henery
- arks Australia, Department of Agriculture, Water and the Environment, Hobart, Australia
| | - Dieter Hochuli
- School of Life and Environmental Sciences, The University of Sydney, Camperdown, Australia
| | | | - Guomin Huang
- Nanchang Institute of Technology, Nanchang, China
| | - Lesley Hughes
- Department of Biological Sciences, Macquarie University, Sydney, Australia
| | - John Huisman
- Western Australian Herbarium, Biodiversity and Conservation Science, Department of Biodiversity, Conservation and Attractions, Kensington, Western Australia, Australia
| | | | - Ashika Jagdish
- Evolution & Ecology Research Centre, School of Biological, Earth, and Environmental Sciences, UNSW Sydney, Sydney, Australia
| | - Daniel Jin
- School of Life and Environmental Sciences, The University of Sydney, Camperdown, Australia
| | | | - Enrique Jurado
- Universidad Autonoma de Nuevo Leon, San Nicolás de los Garza, Mexico
| | | | | | - Jürgen Kellermann
- State Herbarium of South Australia, Botanic Gardens and State Herbarium, Hackney Road, Adelaide, SA, 5000, Australia
| | | | - Michele Kohout
- Department of Environment, Land, Water and Planning, Victoria, Australia
| | - Robert M Kooyman
- Department of Biological Sciences, Macquarie University, Sydney, Australia
| | - Martyna M Kotowska
- Department of Plant Ecology and Ecosystems Research, University of Goettingen, Göttingen, Germany
| | - Hao Ran Lai
- University of Canterbury, Christchurch, New Zealand
| | - Etienne Laliberté
- Institut de recherche en biologie végétale, Université de Montréal, 4101 Sherbrooke Est, Montréal, H1X 2B2, Canada
| | - Hans Lambers
- University of Western Australia, Crawley, Australia
| | | | - Robert Lanfear
- Ecology and Evolution, Research School of Biology, Australian National University, Canberra, Australia
| | - Frank van Langevelde
- Wildlife Ecology & Conservation Group, Wageningen University, Wageningen, The Netherlands
| | - Daniel C Laughlin
- Department of Botany, University of Wyoming, Laramie, WY, 82071, USA
| | | | | | | | - Andrea Leigh
- University of Technology Sydney, Sydney, Australia
| | | | - Tanja Lenz
- Department of Biological Sciences, Macquarie University, Sydney, Australia
| | - Brendan Lepschi
- Centre for Australian National Biodiversity Research (a joint venture between Parks Australia and CSIRO), Canberra, ACT, Australia
| | | | - Felix Lim
- AMAP (Botanique et Modélisation de l'Architecture des Plantes et des Végétations), Université de Montpellier, CIRAD, CNRS, INRA, IRD, Montpellier, France
| | | | | | - Christopher H Lusk
- Environmental Research Institute, University of Waikato, Hamilton, New Zealand
| | | | - Hannah McPherson
- National Herbarium of New South Wales, Australian Institute of Botanical Science, Royal Botanic Gardens and Domain Trust, Sydney, Australia
| | - Susana Magallón
- Laboratorio Nacional de Ciencias de la Sostenibilidad, Instituto de Ecología, Universidad Nacional Autónoma de México, Ciudad de México, Mexico
| | - Anthony Manea
- Department of Biological Sciences, Macquarie University, Sydney, Australia
| | - Andrea López-Martinez
- Laboratorio Nacional de Ciencias de la Sostenibilidad, Instituto de Ecología, Universidad Nacional Autónoma de México, Ciudad de México, Mexico
| | - Margaret Mayfield
- School of Biological Sciences, The University of Queensland, St Lucia, Australia
| | | | | | - Marlien van der Merwe
- Research Centre for Ecosystem Resilience, Australian Institute of Botanical Science, Royal Botanic Gardens and Domain Trust, Sydney, Australia
| | | | | | | | - Angela T Moles
- Evolution & Ecology Research Centre, School of Biological, Earth, and Environmental Sciences, UNSW Sydney, Sydney, Australia
| | - Ben D Moore
- Hawkesbury Institute for the Environment, Western Sydney University, Sydney, Australia
| | | | | | | | - Annette Muir
- Department of Environment, Land, Water and Planning, Victoria, Australia
| | - Samantha Munroe
- Terrestrial Ecosystem Research Network, The School of Biological Sciences, The University of Adelaide, Adelaide, SA, 5005, Australia
| | | | - Dean Nicolle
- Currency Creek Arboretum, Currency Creek, Australia
| | | | - Ülo Niinemets
- Estonian University of Life Sciences, Tartu, Estonia
| | - Tom North
- Centre for Australian National Biodiversity Research (a joint venture between Parks Australia and CSIRO), Canberra, ACT, Australia
| | | | | | - Brad Oberle
- Division of Natural Sciences, New College of Florida, Sarasota, USA
| | - Yusuke Onoda
- Graduate School of Agriculture, Kyoto University, Kyoto, Japan
| | - Mark K J Ooi
- Centre for Ecosystem Science, School of Biological, Earth, and Environmental Sciences, UNSW, Sydney, Australia
| | - Colin P Osborne
- University of Sheffield, Department of Animal and Plant Sciences, Sheffield, United Kingdom
| | - Grazyna Paczkowska
- Western Australian Herbarium, Keiran McNamara Conservation Science Centre, Department of Biodiversity, Conservation and Attractions, Western Australia, Kensington, Australia
| | - Burak Pekin
- Istanbul Technical University, Eurasia Institute of Earth Sciences, Istanbul, Turkey
| | - Caio Guilherme Pereira
- Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, USA
| | | | | | | | - Pieter Poot
- College of Science and Engineering, James Cook University, Cairns, QLD, Australia
| | - Jeff R Powell
- Hawkesbury Institute for the Environment, Western Sydney University, Sydney, Australia
| | - Sally A Power
- Hawkesbury Institute for the Environment, Western Sydney University, Sydney, Australia
| | | | | | | | - Jennifer Read
- School of Biological Sciences, Monash University, Clayton, Australia
| | - Victoria Reynolds
- School of Biological Sciences, The University of Queensland, St Lucia, Australia
| | | | - Ben Richardson
- Western Australian Herbarium, Department of Biodiversity, Conservation and Attractions, Western Australia, Kensington, Australia
| | | | - Julieta A Rosell
- Laboratorio Nacional de Ciencias de la Sostenibilidad, Instituto de Ecología, Universidad Nacional Autónoma de México, Ciudad de México, Mexico
| | - Maurizio Rossetto
- National Herbarium of New South Wales, Australian Institute of Botanical Science, Royal Botanic Gardens and Domain Trust, Sydney, Australia
| | - Barbara Rye
- Western Australian Herbarium, Department of Biodiversity, Conservation and Attractions, Western Australia, Kensington, Australia
| | - Paul D Rymer
- Hawkesbury Institute for the Environment, Western Sydney University, Sydney, Australia
| | - Michael A Sams
- School of Biological Sciences, The University of Queensland, St Lucia, Australia
| | - Gordon Sanson
- School of Biological Sciences, Monash University, Clayton, Australia
| | - Hervé Sauquet
- National Herbarium of New South Wales, Australian Institute of Botanical Science, Royal Botanic Gardens and Domain Trust, Sydney, Australia
| | - Susanne Schmidt
- School of Agriculture and Food Science, University of Queensland, St Lucia, Australia
| | - Jürg Schönenberger
- Department of Botany and Biodiversity Research, University of Vienna, Vienna, Austria
| | | | - Kerrie Sendall
- Rider University, Lawrence Township, Lawrenceville, NJ, USA
| | - Steve Sinclair
- Department of Plant Ecology and Ecosystems Research, University of Goettingen, Göttingen, Germany
| | - Benjamin Smith
- Hawkesbury Institute for the Environment, Western Sydney University, Sydney, Australia
| | - Renee Smith
- Hawkesbury Institute for the Environment, Western Sydney University, Sydney, Australia
| | | | - Ben Sparrow
- Terrestrial Ecosystem Research Network, The School of Biological Sciences, The University of Adelaide, Adelaide, SA, 5005, Australia
| | - Rachel J Standish
- Environmental and Conservation Sciences, Murdoch University, Murdoch, Australia
| | - Timothy L Staples
- School of Biological Sciences, The University of Queensland, St Lucia, Australia
| | - Ruby Stephens
- Department of Biological Sciences, Macquarie University, Sydney, Australia
| | | | - Guy Taseski
- Evolution & Ecology Research Centre, School of Biological, Earth, and Environmental Sciences, UNSW Sydney, Sydney, Australia
| | - Elizabeth Tasker
- NSW Department of Planning Industry and Environment, Parramatta, Australia
| | | | - David T Tissue
- Hawkesbury Institute for the Environment, Western Sydney University, Sydney, Australia
| | - Mark G Tjoelker
- Hawkesbury Institute for the Environment, Western Sydney University, Sydney, Australia
| | - David Yue Phin Tng
- Centre for Rainforest Studies, School for Field Studies, Yungaburra, Queensland, 4872, Australia
| | - Félix de Tombeur
- TERRA Teaching and Research Centre, Gembloux Agro-Bio Tech, University of Liege, Gembloux, Belgium
| | | | | | | | - Susanna Venn
- Centre for Integrative Ecology, School of Life and Environmental Sciences, Deakin University, Burwood, Australia
| | - Peter Vesk
- University of Melbourne, Melbourne, Australia
| | - Carolyn Vlasveld
- School of Biological Sciences, Monash University, Clayton, Australia
| | | | - Charles A Warren
- School of Life and Environmental Sciences, The University of Sydney, Camperdown, Australia
| | | | | | - Jessie Wells
- School of Biological Sciences, The University of Queensland, St Lucia, Australia
| | - Mark Westoby
- Department of Biological Sciences, Macquarie University, Sydney, Australia
| | - Matthew White
- Department of Environment, Land, Water and Planning, Victoria, Australia
| | | | - Jarrah Wills
- School of Life and Environmental Sciences, The University of Sydney, Camperdown, Australia
| | - Peter G Wilson
- National Herbarium of NSW and Royal Botanic Gardens and Domain Trust, Sydney, Australia
| | - Colin Yates
- Biodiversity and Conservation Science, Department of Biodiversity, Conservation and Attractions, Kensington, WA, Australia
| | - Amy E Zanne
- Department of Biological Sciences, George Washington University, Washington, DC, 20052, USA
- Department of Biology, University of Miami, Coral Gables, Florida 33146 USA, George Washington University, Washington, DC, 20052, USA
| | | | - Kasia Ziemińska
- AMAP (Botanique et Modélisation de l'Architecture des Plantes et des Végétations), Université de Montpellier, CIRAD, CNRS, INRA, IRD, Montpellier, France
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14
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Joynson R, Molero G, Coombes B, Gardiner L, Rivera‐Amado C, Piñera‐Chávez FJ, Evans JR, Furbank RT, Reynolds MP, Hall A. Uncovering candidate genes involved in photosynthetic capacity using unexplored genetic variation in Spring Wheat. Plant Biotechnol J 2021; 19:1537-1552. [PMID: 33638599 PMCID: PMC8384606 DOI: 10.1111/pbi.13568] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/09/2020] [Accepted: 01/26/2021] [Indexed: 05/10/2023]
Abstract
To feed an ever-increasing population we must leverage advances in genomics and phenotyping to harness the variation in wheat breeding populations for traits like photosynthetic capacity which remains unoptimized. Here we survey a diverse set of wheat germplasm containing elite, introgression and synthetic derivative lines uncovering previously uncharacterized variation. We demonstrate how strategic integration of exotic material alleviates the D genome genetic bottleneck in wheat, increasing SNP rate by 62% largely due to Ae. tauschii synthetic wheat donors. Across the panel, 67% of the Ae. tauschii donor genome is represented as introgressions in elite backgrounds. We show how observed genetic variation together with hyperspectral reflectance data can be used to identify candidate genes for traits relating to photosynthetic capacity using association analysis. This demonstrates the value of genomic methods in uncovering hidden variation in wheat and how that variation can assist breeding efforts and increase our understanding of complex traits.
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Affiliation(s)
| | - Gemma Molero
- Global Wheat Program, International Maize and Wheat Improvement Centre (CIMMYT)TexcocoMexico
| | | | | | - Carolina Rivera‐Amado
- Global Wheat Program, International Maize and Wheat Improvement Centre (CIMMYT)TexcocoMexico
| | | | - John R. Evans
- ARC Centre of Excellence for Translational PhotosynthesisAustralian National UniversityCanberraAustralia
| | - Robert T. Furbank
- ARC Centre of Excellence for Translational PhotosynthesisAustralian National UniversityCanberraAustralia
| | - Matthew P. Reynolds
- Global Wheat Program, International Maize and Wheat Improvement Centre (CIMMYT)TexcocoMexico
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15
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Zavafer A, Losciale P, Öquist G, He J, Evans JR, Fitzpatrick D, Oguchi R, Fan D, Osmond CB, Zhang M, Huang W, McCaffery S, Szabó M. Wah Soon Chow, a teacher, a friend and a colleague. Photosynth Res 2021; 149:253-258. [PMID: 34319557 DOI: 10.1007/s11120-021-00864-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
To finish this special issue, some friends, colleagues and students of Prof. Chow (Emeritus Professor, the Research School of Biology, the Australian National University) have written small tributes to acknowledge not only his eminent career but to describe his wonderful personality.
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Affiliation(s)
- Alonso Zavafer
- Division of Plant Sciences, Research School of Biology, Australian National University, Canberra, ACT, 2601, Australia.
- Climate Change Cluster (C3), University of Technology Sydney, Sydney, NSW, 2007, Australia.
| | - Pasquale Losciale
- Department of Soil, Plant and Food Sciences, University of Bari "Aldo Moro", Via Amendola 165/A, 70126, Bari, Italy
| | | | - Jie He
- National Institute of Education, Nanyang Technological University, Singapore, Singapore
| | - John R Evans
- Division of Plant Sciences, Research School of Biology, Australian National University, Canberra, ACT, 2601, Australia
| | - Duncan Fitzpatrick
- Division of Plant Sciences, Research School of Biology, Australian National University, Canberra, ACT, 2601, Australia
| | - Riichi Oguchi
- Department of Biological Sciences, School of Science, The University of Tokyo, 7‑3‑1 Hongo, Bunkyo‑ku, Tokyo, 113‑0033, Japan
| | - Dayong Fan
- Division of Plant Sciences, Research School of Biology, Australian National University, Canberra, ACT, 2601, Australia
- College of Forestry, Beijing Forestry University, Beijing, China
| | - Charles Barry Osmond
- Division of Plant Sciences, Research School of Biology, Australian National University, Canberra, ACT, 2601, Australia
- SMART, University of Wollongong, Wollongong, NSW, Australia
| | - Mengmeng Zhang
- College of Life Science, Heilongjiang University, Ha'erbin, 150080, China
| | - Wei Huang
- Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, 650201, China
| | - Stephanie McCaffery
- Division of Plant Sciences, Research School of Biology, Australian National University, Canberra, ACT, 2601, Australia
| | - Milán Szabó
- Climate Change Cluster (C3), University of Technology Sydney, Sydney, NSW, 2007, Australia
- Biological Research Centre, Institute of Plant Biology, Eötvös Loránd Research Network (ELKH), Szeged, Hungary
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16
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Macniven R, Canuto KJ, Evans JR. Facilitators and barriers to physical activity participation experienced by Aboriginal and Torres Strait Islander adults: a mixed methods systematic review protocol. JBI Evid Synth 2021; 19:1659-1667. [PMID: 33394622 DOI: 10.11124/jbies-20-00339] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
OBJECTIVE To synthesize the existing research about physical activity and sport facilitators and barriers experienced by Aboriginal and Torres Strait Islander adults in Australia. INTRODUCTION Physical activity and sport have cultural importance for First Nations peoples. Achieving health and broader benefits from physical activity and sport is impacted by experiences of both facilitators and barriers to participation. Identifying how to facilitate participation and overcome barriers to physical activity and sport is important to develop strategies to increase physical activity levels and sport participation among Aboriginal and Torres Strait Islander adults. Several studies have examined physical activity and sport facilitators and barriers experienced by Aboriginal and Torres Strait Islander adults, and collective synthesis of these studies can provide a more comprehensive understanding of their findings. INCLUSION CRITERIA This mixed methods systematic review will consider studies that include Aboriginal and Torres Strait Islander peoples aged 18 years and over from any setting or region of Australia. Studies will be considered if they report on facilitators and barriers to physical activity and/or sport participation. METHODS Eleven databases will be searched, as well as gray literature sources, and a selection of websites containing resources relevant to physical activity participation for Aboriginal and Torres Strait Islander adults. Studies published in English will be included. No date limits will be set. After screening the titles and abstracts of identified citations, potentially relevant studies will be retrieved in full. Study selection, critical appraisal, data extraction, and data synthesis will be undertaken according to the convergent integrated approach to mixed methods reviews. SYSTEMATIC REVIEW REGISTRATION NUMBER PROSPERO CRD42020162134.
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Affiliation(s)
- Rona Macniven
- School of Population Health, The University of New South Wales, Sydney, NSW, Australia
- Faculty of Medicine and Health, Poche Centre for Indigenous Health, The University of Sydney, Sydney, NSW, Australia
| | - Karla J Canuto
- Wardliparingga Aboriginal Health Unit, South Australian Health and Medical Research Institute, Adelaide, SA, Australia
| | - John R Evans
- Faculty of Health, University of Technology Sydney, Sydney, NSW, Australia
- Sydney School of Education and Social Work, The University of Sydney, Sydney, NSW, Australia
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17
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Camacho M, Macleod AD, Maple-Grødem J, Evans JR, Breen DP, Cummins G, Wijeyekoon RS, Greenland JC, Alves G, Tysnes OB, Lawson RA, Barker RA, Williams-Gray CH. Early constipation predicts faster dementia onset in Parkinson's disease. NPJ Parkinsons Dis 2021; 7:45. [PMID: 34039994 PMCID: PMC8154963 DOI: 10.1038/s41531-021-00191-w] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2020] [Accepted: 02/26/2021] [Indexed: 02/04/2023] Open
Abstract
Constipation is a common but not a universal feature in early PD, suggesting that gut involvement is heterogeneous and may be part of a distinct PD subtype with prognostic implications. We analysed data from the Parkinson's Incidence Cohorts Collaboration, composed of incident community-based cohorts of PD patients assessed longitudinally over 8 years. Constipation was assessed with the MDS-UPDRS constipation item or a comparable categorical scale. Primary PD outcomes of interest were dementia, postural instability and death. PD patients were stratified according to constipation severity at diagnosis: none (n = 313, 67.3%), minor (n = 97, 20.9%) and major (n = 55, 11.8%). Clinical progression to all three outcomes was more rapid in those with more severe constipation at baseline (Kaplan-Meier survival analysis). Cox regression analysis, adjusting for relevant confounders, confirmed a significant relationship between constipation severity and progression to dementia, but not postural instability or death. Early constipation may predict an accelerated progression of neurodegenerative pathology.
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Affiliation(s)
- M Camacho
- Department of Clinical Neurosciences, University of Cambridge, Cambridge, UK.
| | - A D Macleod
- Institute of Applied Health Sciences, University of Aberdeen, Aberdeen, UK
| | - J Maple-Grødem
- The Norwegian Centre for Movement Disorders, Stavanger University Hospital, Stavanger, Norway
- Department of Chemistry, Bioscience and Environmental Engineering, University of Stavanger, Stavanger, Norway
| | - J R Evans
- Nottingham University Hospital NHS Trust, Nottingham, UK
| | - D P Breen
- Centre for Clinical Brain Sciences, University of Edinburgh, Edinburgh, UK
- Anne Rowling Regenerative Neurology Clinic, University of Edinburgh, Edinburgh, UK
- Usher Institute of Population Health Sciences and Informatics, University of Edinburgh, Edinburgh, UK
| | - G Cummins
- Department of Clinical Neurosciences, University of Cambridge, Cambridge, UK
| | - R S Wijeyekoon
- Department of Clinical Neurosciences, University of Cambridge, Cambridge, UK
| | - J C Greenland
- Department of Clinical Neurosciences, University of Cambridge, Cambridge, UK
| | - G Alves
- The Norwegian Centre for Movement Disorders, Stavanger University Hospital, Stavanger, Norway
- Department of Chemistry, Bioscience and Environmental Engineering, University of Stavanger, Stavanger, Norway
| | - O B Tysnes
- Department of Neurology, Haukeland University Hospital, University of Bergen, Bergen, Norway
| | - R A Lawson
- Translational and Clinical Research Institute, Newcastle University, Newcastle upon Tyne, UK
| | - R A Barker
- Department of Clinical Neurosciences, University of Cambridge, Cambridge, UK
- Wellcome Trust-MRC Cambridge Stem Cell Institute, University of Cambridge, Cambridge, UK
| | - C H Williams-Gray
- Department of Clinical Neurosciences, University of Cambridge, Cambridge, UK
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18
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Groszmann M, De Rosa A, Ahmed J, Chaumont F, Evans JR. A consensus on the Aquaporin Gene Family in the Allotetraploid Plant, Nicotiana tabacum. Plant Direct 2021; 5:e00321. [PMID: 33977216 PMCID: PMC8104905 DOI: 10.1002/pld3.321] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/09/2020] [Revised: 08/03/2021] [Accepted: 03/13/2021] [Indexed: 05/11/2023]
Abstract
Aquaporins (AQPs) are membrane-spanning channel proteins with exciting applications for plant engineering and industrial applications. Translational outcomes will be improved by better understanding the extensive diversity of plant AQPs. However, AQP gene families are complex, making exhaustive identification difficult, especially in polyploid species. The allotetraploid species of Nicotiana tabacum (Nt; tobacco) plays a significant role in modern biological research and is closely related to several crops of economic interest, making it a valuable platform for AQP research. Recently, De Rosa et al., (2020) and Ahmed et al., (2020), concurrently reported on the AQP gene family in tobacco, establishing family sizes of 76 and 88 members, respectively. The discrepancy highlights the difficulties of characterizing large complex gene families. Here, we identify and resolve the differences between the two studies, clarify gene models, and yield a consolidated collection of 84 members that more accurately represents the complete NtAQP family. Importantly, this consensus NtAQP collection will reduce confusion and ambiguity that would inevitably arise from having two different descriptive studies and sets of NtAQP gene names. This report also serves as a case study, highlighting and discussing variables to be considered and refinements required to ensure comprehensive gene family characterizations, which become valuable resources for examining the evolution and biological functions of genes.
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Affiliation(s)
- Michael Groszmann
- ARC Centre of Excellence for Translational PhotosynthesisResearch School of BiologyAustralian National UniversityCanberraACTAustralia
| | - Annamaria De Rosa
- ARC Centre of Excellence for Translational PhotosynthesisResearch School of BiologyAustralian National UniversityCanberraACTAustralia
| | - Jahed Ahmed
- Louvain Institute of Biomolecular Science and TechnologyUCLouvainLouvain‐la‐NeuveBelgium
| | - François Chaumont
- Louvain Institute of Biomolecular Science and TechnologyUCLouvainLouvain‐la‐NeuveBelgium
| | - John R. Evans
- ARC Centre of Excellence for Translational PhotosynthesisResearch School of BiologyAustralian National UniversityCanberraACTAustralia
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19
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Sakoda K, Yamori W, Groszmann M, Evans JR. Stomatal, mesophyll conductance, and biochemical limitations to photosynthesis during induction. Plant Physiol 2021; 185:146-160. [PMID: 33631811 PMCID: PMC8133641 DOI: 10.1093/plphys/kiaa011] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/18/2020] [Accepted: 10/22/2020] [Indexed: 05/07/2023]
Abstract
The dynamics of leaf photosynthesis in fluctuating light affects carbon gain by plants. Mesophyll conductance (gm) limits CO2 assimilation rate (A) under the steady state, but the extent of this limitation under non-steady-state conditions is unknown. In the present study, we aimed to characterize the dynamics of gm and the limitations to A imposed by gas diffusional and biochemical processes under fluctuating light. The induction responses of A, stomatal conductance (gs), gm, and the maximum rate of RuBP carboxylation (Vcmax) or electron transport (J) were investigated in Arabidopsis (Arabidopsis thaliana (L.)) and tobacco (Nicotiana tabacum L.). We first characterized gm induction after a change from darkness to light. Each limitation to A imposed by gm, gs and Vcmax or J was significant during induction, indicating that gas diffusional and biochemical processes limit photosynthesis. Initially, gs imposed the greatest limitation to A, showing the slowest response under high light after long and short periods of darkness, assuming RuBP-carboxylation limitation. However, if RuBP-regeneration limitation was assumed, then J imposed the greatest limitation. gm did not vary much following short interruptions to light. The limitation to A imposed by gm was the smallest of all the limitations for most of the induction phase. This suggests that altering induction kinetics of mesophyll conductance would have little impact on A following a change in light. To enhance the carbon gain by plants under naturally dynamic light environments, attention should therefore be focused on faster stomatal opening or activation of electron transport.
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Affiliation(s)
- Kazuma Sakoda
- Graduate School of Agricultural and Life Sciences, University of Tokyo, Nishitokyo 188-0002, Tokyo, Japan
- Research Fellow of Japan Society for the Promotion of Science, Tokyo, Japan
| | - Wataru Yamori
- Graduate School of Agricultural and Life Sciences, University of Tokyo, Nishitokyo 188-0002, Tokyo, Japan
| | - Michael Groszmann
- Division of Plant Science, Research School of Biology, The Australian National University, Canberra, Territory 2601, Australia
| | - John R Evans
- Division of Plant Science, Research School of Biology, The Australian National University, Canberra, Territory 2601, Australia
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20
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Khan HA, Nakamura Y, Furbank RT, Evans JR. Effect of leaf temperature on the estimation of photosynthetic and other traits of wheat leaves from hyperspectral reflectance. J Exp Bot 2021; 72:1271-1281. [PMID: 33252664 DOI: 10.1093/jxb/eraa514] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/21/2020] [Accepted: 10/30/2020] [Indexed: 05/21/2023]
Abstract
A growing number of leaf traits can be estimated from hyperspectral reflectance data. These include structural and compositional traits, such as leaf mass per area (LMA) and nitrogen and chlorophyll content, but also physiological traits such a Rubisco carboxylation activity, electron transport rate, and respiration rate. Since physiological traits vary with leaf temperature, how does this impact on predictions made from reflectance measurements? We investigated this with two wheat varieties, by repeatedly measuring each leaf through a sequence of temperatures imposed by varying the air temperature in a growth room. Leaf temperatures ranging from 20 °C to 35 °C did not alter the estimated Rubisco capacity normalized to 25 °C (Vcmax25), or chlorophyll or nitrogen contents per unit leaf area. Models estimating LMA and Vcmax25/N were both slightly influenced by leaf temperature: estimated LMA increased by 0.27% °C-1 and Vcmax25/N increased by 0.46% °C-1. A model estimating Rubisco activity closely followed variation associated with leaf temperature. Reflectance spectra change with leaf temperature and therefore contain a temperature signal.
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Affiliation(s)
- Hammad A Khan
- ARC Centre of Excellence for Translational Photosynthesis, Research School of Biology, The Australian National University, Canberra, ACT, Australia
- Department of Primary Industries and Regional Development (DPIRD), Northam, WA, Australia
| | - Yukiko Nakamura
- ARC Centre of Excellence for Translational Photosynthesis, Research School of Biology, The Australian National University, Canberra, ACT, Australia
- Graduate School of Life Sciences, Tohoku University, Japan
| | - Robert T Furbank
- ARC Centre of Excellence for Translational Photosynthesis, Research School of Biology, The Australian National University, Canberra, ACT, Australia
- CSIRO Agriculture & Food, Canberra, ACT, Australia
| | - John R Evans
- ARC Centre of Excellence for Translational Photosynthesis, Research School of Biology, The Australian National University, Canberra, ACT, Australia
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21
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Abstract
A significant resistance to CO2 diffusion is imposed by mesophyll tissue inside leaves. Mesophyll resistance, rm (or its reciprocal, mesophyll conductance, gm ), reduces the rate at which Rubisco can fix CO2 , increasing the water and nitrogen costs of carbon acquisition. gm varies in proportion to the surface area of chloroplasts exposed to intercellular airspace per unit leaf area. It also depends on the thickness and effective porosity of the cell wall and the CO2 permeabilities of membranes. As no measurements exist for the effective porosity of mesophyll cell walls, and CO2 permeability values are too low to account for observed rates of CO2 assimilation, conclusions from modelling must be treated with caution. There is great variation in the mesophyll resistance per unit chloroplast area for a given cell wall thickness, which may reflect differences in effective porosity. While apparent gm can vary with CO2 and irradiance, the underlying conductance at the cellular level may remain unchanged. Dynamic changes in apparent gm arise for spatial reasons and because chloroplasts differ in their photosynthetic composition and operate in different light environments. Measurements of the temperature sensitivity of membrane CO2 permeability are urgently needed to explain variation in temperature responses of gm .
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Affiliation(s)
- John R Evans
- ARC Centre of Excellence for Translational Photosynthesis, Research School of Biology, The Australian National University, Canberra, ACT, 2601, Australia
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22
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Sugiura D, Terashima I, Evans JR. A Decrease in Mesophyll Conductance by Cell-Wall Thickening Contributes to Photosynthetic Downregulation. Plant Physiol 2020; 183:1600-1611. [PMID: 32518201 PMCID: PMC7401118 DOI: 10.1104/pp.20.00328] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/17/2020] [Accepted: 05/26/2020] [Indexed: 05/30/2023]
Abstract
It has been argued that accumulation of nonstructural carbohydrates triggers a decrease in Rubisco content, which downregulates photosynthesis. However, a decrease in the sink-source ratio in several plant species leads to a decrease in photosynthesis and increases in both structural and nonstructural carbohydrate content. Here, we tested whether increases in cell-wall materials, rather than starch content, impact directly on photosynthesis by decreasing mesophyll conductance. We measured various morphological, anatomical, and physiological traits in primary leaves of soybean (Glycine max) and French bean (Phaseolus vulgaris) grown under high- or low-nitrogen conditions. We removed other leaves 2 weeks after sowing to decrease the sink-source ratio and conducted measurements 0, 1, and 2 weeks after defoliation.
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Affiliation(s)
- Daisuke Sugiura
- Graduate School of Bioagricultural Sciences, Nagoya University, Chikusa, Nagoya 464-8601, Japan
- Department of Biological Sciences, Graduate School of Science, The University of Tokyo, Bunkyo, Tokyo 113-0033, Japan
| | - Ichiro Terashima
- Department of Biological Sciences, Graduate School of Science, The University of Tokyo, Bunkyo, Tokyo 113-0033, Japan
| | - John R Evans
- Australian Research Council Centre of Excellence for Translational Photosynthesis, Research School of Biology, The Australian National University, Canberra, Australian Capital Territory 2601, Australia
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23
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Macniven R, Foley BC, Owen KB, Evans JR, Bauman AE, Reece LJ. Physical activity and sport participation characteristics of Indigenous children registered in the Active Kids voucher program in New South Wales. J Sci Med Sport 2020; 23:1178-1184. [PMID: 32653250 DOI: 10.1016/j.jsams.2020.06.016] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2019] [Revised: 05/22/2020] [Accepted: 06/26/2020] [Indexed: 11/18/2022]
Abstract
OBJECTIVES Investigate sociodemographic factors associated with physical activity and sport participation among Indigenous children registered in the New South Wales (NSW) government-funded Active Kids voucher program in 2018, including comparison with non-Indigenous children. DESIGN Cross-sectional study. METHODS The Active Kids voucher program aims to support the cost of children's sport and physical activities. All children aged 5-18 years in NSW are eligible for a voucher. To register, parent/carers report child sociodemographic characteristics, physical activity, sport participation and optional height and weight. Regression models were used to determine which sociodemographic characteristics were associated with meeting physical activity guidelines and sport participation for Indigenous and non-Indigenous children. RESULTS Of the 671,375 children aged 5-18 years, 36,129 (5.4%) were Indigenous. More Indigenous children than non-Indigenous children met the physical activity guidelines before registering in the Active Kids program. Indigenous children had greater odds of meeting physical activity guidelines across all socio-economic quartiles. Among non-Indigenous children, odds reduced with social disadvantage. Indigenous children (38%) were less likely to participate in organised physical activity and sport sessions at least twice a week compared to non-Indigenous children (43%). Indigenous children living in major cities had higher sport participation levels compared with those living in outer regional and remote areas. CONCLUSIONS The Active Kids voucher program achieved population representative reach among Indigenous children, whose physical activity levels were higher than non-Indigenous children across all socioeconomic quartiles. The program has potential to supplement Indigenous children's physical activity levels using organised sessions and reduce sport drop-out among older children.
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Affiliation(s)
- Rona Macniven
- University of New South Wales, School of Public Health and Community Medicine, Australia; The University of Sydney, Faculty of Medicine and Health, Poche Centre for Indigenous Health, Australia
| | - Bridget C Foley
- The University of Sydney, SPRINTER, Prevention Research Collaboration, The Charles Perkins Centre, Sydney School of Public Health, Australia
| | - Katherine B Owen
- The University of Sydney, SPRINTER, Prevention Research Collaboration, The Charles Perkins Centre, Sydney School of Public Health, Australia
| | - John R Evans
- University of Technology Sydney, Faculty of Health, Australia
| | - Adrian E Bauman
- The University of Sydney, SPRINTER, Prevention Research Collaboration, The Charles Perkins Centre, Sydney School of Public Health, Australia
| | - Lindsey J Reece
- The University of Sydney, SPRINTER, Prevention Research Collaboration, The Charles Perkins Centre, Sydney School of Public Health, Australia.
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24
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De Rosa A, Watson-Lazowski A, Evans JR, Groszmann M. Genome-wide identification and characterisation of Aquaporins in Nicotiana tabacum and their relationships with other Solanaceae species. BMC Plant Biol 2020; 20:266. [PMID: 32517797 PMCID: PMC7285608 DOI: 10.1186/s12870-020-02412-5] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2019] [Accepted: 04/28/2020] [Indexed: 05/25/2023]
Abstract
BACKGROUND Cellular membranes are dynamic structures, continuously adjusting their composition, allowing plants to respond to developmental signals, stresses, and changing environments. To facilitate transmembrane transport of substrates, plant membranes are embedded with both active and passive transporters. Aquaporins (AQPs) constitute a major family of membrane spanning channel proteins that selectively facilitate the passive bidirectional passage of substrates across biological membranes at an astonishing 108 molecules per second. AQPs are the most diversified in the plant kingdom, comprising of five major subfamilies that differ in temporal and spatial gene expression, subcellular protein localisation, substrate specificity, and post-translational regulatory mechanisms; collectively providing a dynamic transportation network spanning the entire plant. Plant AQPs can transport a range of solutes essential for numerous plant processes including, water relations, growth and development, stress responses, root nutrient uptake, and photosynthesis. The ability to manipulate AQPs towards improving plant productivity, is reliant on expanding our insight into the diversity and functional roles of AQPs. RESULTS We characterised the AQP family from Nicotiana tabacum (NtAQPs; tobacco), a popular model system capable of scaling from the laboratory to the field. Tobacco is closely related to major economic crops (e.g. tomato, potato, eggplant and peppers) and itself has new commercial applications. Tobacco harbours 76 AQPs making it the second largest characterised AQP family. These fall into five distinct subfamilies, for which we characterised phylogenetic relationships, gene structures, protein sequences, selectivity filter compositions, sub-cellular localisation, and tissue-specific expression. We also identified the AQPs from tobacco's parental genomes (N. sylvestris and N. tomentosiformis), allowing us to characterise the evolutionary history of the NtAQP family. Assigning orthology to tomato and potato AQPs allowed for cross-species comparisons of conservation in protein structures, gene expression, and potential physiological roles. CONCLUSIONS This study provides a comprehensive characterisation of the tobacco AQP family, and strengthens the current knowledge of AQP biology. The refined gene/protein models, tissue-specific expression analysis, and cross-species comparisons, provide valuable insight into the evolutionary history and likely physiological roles of NtAQPs and their Solanaceae orthologs. Collectively, these results will support future functional studies and help transfer basic research to applied agriculture.
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Affiliation(s)
- Annamaria De Rosa
- ARC Centre of Excellence for Translational Photosynthesis, Research School of Biology, Australian National University, ACT, Canberra, 2601, Australia
| | - Alexander Watson-Lazowski
- ARC Centre of Excellence for Translational Photosynthesis, Hawkesbury Institute for the Environment, Western Sydney University, Sydney, NSW, 2751, Australia
| | - John R Evans
- ARC Centre of Excellence for Translational Photosynthesis, Research School of Biology, Australian National University, ACT, Canberra, 2601, Australia
| | - Michael Groszmann
- ARC Centre of Excellence for Translational Photosynthesis, Research School of Biology, Australian National University, ACT, Canberra, 2601, Australia.
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Flohr BM, Hunt JR, Kirkegaard JA, Rheinheimer B, Swan T, Goward L, Evans JR, Bullock M. Deep Soil Water-Use Determines the Yield Benefit of Long-Cycle Wheat. Front Plant Sci 2020; 11:548. [PMID: 32499799 PMCID: PMC7242739 DOI: 10.3389/fpls.2020.00548] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2019] [Accepted: 04/09/2020] [Indexed: 05/23/2023]
Abstract
Wheat production in southern Australia is reliant on autumn (April-May) rainfall to germinate seeds and allow timely establishment. Reliance on autumn rainfall can be removed by sowing earlier than currently practiced and using late summer and early autumn rainfall to establish crops, but this requires slower developing cultivars to match life-cycle to seasonal conditions. While slow-developing wheat cultivars sown early in the sowing window (long-cycle), have in some cases increased yield in comparison to the more commonly grown fast-developing cultivars sown later (short-cycle), the yield response is variable between environments. In irrigated wheat in the sub-tropics, the variable response has been linked to ability to withstand water stress, but the mechanism behind this is unknown. We compared short- vs. long-cycle cultivars × time of sowing combinations over four seasons (2011, 2012, 2015, and 2016) at Temora, NSW, Australia. Two seasons (2011 and 2012) had above average summer fallow (December-March) rain, and two seasons had below average summer fallow rain (2015 and 2016). Initial plant available water in each season was 104, 91, 28, and 27 mm, respectively. Rainfall in the 30 days prior to flowering (approximating the critical period for yield determination) in each year was 8, 6, 14, and 190 mm, respectively. We only observed a yield benefit in long-cycle treatments in 2011 and 2012 seasons where there was (i) soil water stored at depth (ii) little rain during the critical period. The higher yield of long-cycle treatments could be attributed to greater deep soil water extraction (<1.0 m), dry-matter production and grain number. In 2015, there was little rain during the critical period, no water stored at depth and no difference between treatments. In 2016, high in-crop rainfall filled the soil profile, but high rainfall during the critical period removed crop reliance on deep water, and yields were equivalent. A simulation study extended our findings to demonstrate a median yield benefit in long-cycle treatments when the volume of starting soil water was increased. This work reveals environmental conditions that can be used to quantify the frequency of circumstances where long-cycle wheat will provide a yield advantage over current practice.
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Affiliation(s)
- Bonnie M. Flohr
- The Commonwealth Scientific and Industrial Research Organisation (CSIRO) Agriculture and Food, Adelaide, SA, Australia
| | - James R. Hunt
- Department of Animal, Plant and Soil Sciences, La Trobe University, Melbourne, VIC, Australia
| | - John A. Kirkegaard
- The Commonwealth Scientific and Industrial Research Organisation (CSIRO) Agriculture and Food, Canberra, ACT, Australia
| | - Brad Rheinheimer
- The Commonwealth Scientific and Industrial Research Organisation (CSIRO) Agriculture and Food, Canberra, ACT, Australia
| | - Tony Swan
- The Commonwealth Scientific and Industrial Research Organisation (CSIRO) Agriculture and Food, Canberra, ACT, Australia
| | - Laura Goward
- The Commonwealth Scientific and Industrial Research Organisation (CSIRO) Agriculture and Food, Canberra, ACT, Australia
| | - John R. Evans
- Research School of Biology, The Australian National University, Canberra, ACT, Australia
| | - Melanie Bullock
- The Commonwealth Scientific and Industrial Research Organisation (CSIRO) Agriculture and Food, Canberra, ACT, Australia
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Affiliation(s)
- John R Evans
- ARC Centre of Excellence for Translational Photosynthesis, Research School of Biology, The Australian National University, Canberra, ACT, Australia
| | - Tracy Lawson
- School of Life Sciences, University of Essex, Wivenhoe Park, Colchester, UK
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Silva-Pérez V, De Faveri J, Molero G, Deery DM, Condon AG, Reynolds MP, Evans JR, Furbank RT. Genetic variation for photosynthetic capacity and efficiency in spring wheat. J Exp Bot 2020; 71:2299-2311. [PMID: 31565736 PMCID: PMC7134913 DOI: 10.1093/jxb/erz439] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2019] [Accepted: 09/19/2019] [Indexed: 05/05/2023]
Abstract
One way to increase yield potential in wheat is screening for natural variation in photosynthesis. This study uses measured and modelled physiological parameters to explore genotypic diversity in photosynthetic capacity (Pc, Rubisco carboxylation capacity per unit leaf area at 25 °C) and efficiency (Peff, Pc per unit of leaf nitrogen) in wheat in relation to fertilizer, plant stage, and environment. Four experiments (Aus1, Aus2, Aus3, and Mex1) were carried out with diverse wheat collections to investigate genetic variation for Rubisco capacity (Vcmax25), electron transport rate (J), CO2 assimilation rate, stomatal conductance, and complementary plant functional traits: leaf nitrogen, leaf dry mass per unit area, and SPAD. Genotypes for Aus1 and Aus2 were grown in the glasshouse with two fertilizer levels. Genotypes for Aus3 and Mex1 experiments were grown in the field in Australia and Mexico, respectively. Results showed that Vcmax25 derived from gas exchange measurements is a robust parameter that does not depend on stomatal conductance and was positively correlated with Rubisco content measured in vitro. There was significant genotypic variation in most of the experiments for Pc and Peff. Heritability of Pc reached 0.7 and 0.9 for SPAD. Genotypic variation and heritability of traits show that there is scope for these traits to be used in pre-breeding programmes to improve photosynthesis with the ultimate objective of raising yield potential.
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Affiliation(s)
- Viridiana Silva-Pérez
- CSIRO Agriculture & Food, Canberra, ACT, Australia
- ARC Centre of Excellence for Translational Photosynthesis, Research School of Biology. The Australian National University, Canberra, ACT, Australia
| | | | - Gemma Molero
- International Maize and Wheat Improvement Centre (CIMMYT), México, DF, Mexico
| | | | - Anthony G Condon
- CSIRO Agriculture & Food, Canberra, ACT, Australia
- ARC Centre of Excellence for Translational Photosynthesis, Research School of Biology. The Australian National University, Canberra, ACT, Australia
| | - Matthew P Reynolds
- International Maize and Wheat Improvement Centre (CIMMYT), México, DF, Mexico
| | - John R Evans
- ARC Centre of Excellence for Translational Photosynthesis, Research School of Biology. The Australian National University, Canberra, ACT, Australia
| | - Robert T Furbank
- ARC Centre of Excellence for Translational Photosynthesis, Research School of Biology. The Australian National University, Canberra, ACT, Australia
- Agriculture Victoria, Horsham, VIC, Australia
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28
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Alves Negrini AC, Evans JR, Kaiser BN, Millar AH, Kariyawasam BC, Atkin OK. Effect of N supply on the carbon economy of barley when accounting for plant size. Funct Plant Biol 2020; 47:368-381. [PMID: 32135075 DOI: 10.1071/fp19025] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2019] [Accepted: 12/02/2019] [Indexed: 06/10/2023]
Abstract
Nitrogen availability and ontogeny both affect the relative growth rate (RGR) of plants. In this study of barley (Hordeum vulgare L.) we determined which growth parameters are affected by nitrate (N) availability, and whether these were confounded by differences in plant size, reflecting differences in growth. Plants were hydroponically grown on six different nitrate (N) concentrations for 28 days, and nine harvests were performed to assess the effect of N on growth parameters. Most growth parameters showed similar patterns of responses to N supply whether compared at common time points or common plant sizes. N had a significant effect on the biomass allocation: increasing N increased leaf mass ratio (LMR) and decreased root mass ratio (RMR). Specific leaf area (SLA) was not significantly affected by N. RGR increased with increasing N supply up to 1 mM, associated with increases in both LMR and net assimilation rate (NAR). Increases in N supply above 1 mM did not increase RGR as increases in LMR were offset by decreases in NAR. The high RGR at suboptimal N supply suggest a higher nitrogen use efficiency (biomass/N supply). The reasons for the homeostasis of growth under suboptimal N levels are discussed.
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Affiliation(s)
- Ana Clarissa Alves Negrini
- Australian Research Council Centre of Excellence in Plant Energy Biology, Research School of Biology, Building 134, The Australian National University, Canberra, ACT 2601, Australia; and Corresponding author.
| | - John R Evans
- Australian Research Council Centre of Excellence for Translational Photosynthesis, Building 134, The Australian National University, Canberra, ACT 2601, Australia
| | - Brent N Kaiser
- Centre for Carbon, Water and Food, School of Life and Environmental Science, The University of Sydney, Brownlow Hill, New South Wales 2070, Australia
| | - A Harvey Millar
- Australian Research Council Centre of Excellence in Plant Energy Biology, School of Molecular Sciences, University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia
| | - Buddhima C Kariyawasam
- Australian Research Council Centre of Excellence in Plant Energy Biology, Research School of Biology, Building 134, The Australian National University, Canberra, ACT 2601, Australia
| | - Owen K Atkin
- Australian Research Council Centre of Excellence in Plant Energy Biology, Research School of Biology, Building 134, The Australian National University, Canberra, ACT 2601, Australia
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29
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Coast O, Shah S, Ivakov A, Gaju O, Wilson PB, Posch BC, Bryant CJ, Negrini ACA, Evans JR, Condon AG, Silva-Pérez V, Reynolds MP, Pogson BJ, Millar AH, Furbank RT, Atkin OK. Predicting dark respiration rates of wheat leaves from hyperspectral reflectance. Plant Cell Environ 2019; 42:2133-2150. [PMID: 30835839 DOI: 10.1111/pce.13544] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2018] [Revised: 02/18/2019] [Accepted: 02/24/2019] [Indexed: 05/22/2023]
Abstract
Greater availability of leaf dark respiration (Rdark ) data could facilitate breeding efforts to raise crop yield and improve global carbon cycle modelling. However, the availability of Rdark data is limited because it is cumbersome, time consuming, or destructive to measure. We report a non-destructive and high-throughput method of estimating Rdark from leaf hyperspectral reflectance data that was derived from leaf Rdark measured by a destructive high-throughput oxygen consumption technique. We generated a large dataset of leaf Rdark for wheat (1380 samples) from 90 genotypes, multiple growth stages, and growth conditions to generate models for Rdark . Leaf Rdark (per unit leaf area, fresh mass, dry mass or nitrogen, N) varied 7- to 15-fold among individual plants, whereas traits known to scale with Rdark , leaf N, and leaf mass per area (LMA) only varied twofold to fivefold. Our models predicted leaf Rdark , N, and LMA with r2 values of 0.50-0.63, 0.91, and 0.75, respectively, and relative bias of 17-18% for Rdark and 7-12% for N and LMA. Our results suggest that hyperspectral model prediction of wheat leaf Rdark is largely independent of leaf N and LMA. Potential drivers of hyperspectral signatures of Rdark are discussed.
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Affiliation(s)
- Onoriode Coast
- ARC Centre of Excellence in Plant Energy Biology, Research School of Biology, Australian National University, Canberra, Australian Capital Territory, 2601, Australia
| | - Shahen Shah
- ARC Centre of Excellence in Plant Energy Biology, Research School of Biology, Australian National University, Canberra, Australian Capital Territory, 2601, Australia
- The University of Agriculture Peshawar, Peshawar, 25130, Pakistan
| | - Alexander Ivakov
- ARC Centre of Excellence for Translational Photosynthesis, Research School of Biology, Australian National University, Canberra, Australian Capital Territory, 2601, Australia
| | - Oorbessy Gaju
- ARC Centre of Excellence in Plant Energy Biology, Research School of Biology, Australian National University, Canberra, Australian Capital Territory, 2601, Australia
| | - Philippa B Wilson
- ARC Centre of Excellence in Plant Energy Biology, Research School of Biology, Australian National University, Canberra, Australian Capital Territory, 2601, Australia
| | - Bradley C Posch
- ARC Centre of Excellence in Plant Energy Biology, Research School of Biology, Australian National University, Canberra, Australian Capital Territory, 2601, Australia
| | - Callum J Bryant
- ARC Centre of Excellence in Plant Energy Biology, Research School of Biology, Australian National University, Canberra, Australian Capital Territory, 2601, Australia
| | - Anna Clarissa A Negrini
- ARC Centre of Excellence in Plant Energy Biology, Research School of Biology, Australian National University, Canberra, Australian Capital Territory, 2601, Australia
| | - John R Evans
- ARC Centre of Excellence for Translational Photosynthesis, Research School of Biology, Australian National University, Canberra, Australian Capital Territory, 2601, Australia
| | - Anthony G Condon
- ARC Centre of Excellence for Translational Photosynthesis, Research School of Biology, Australian National University, Canberra, Australian Capital Territory, 2601, Australia
- CSIRO Agriculture, Canberra, Australian Capital Territory, 2601, Australia
| | - Viridiana Silva-Pérez
- ARC Centre of Excellence for Translational Photosynthesis, Research School of Biology, Australian National University, Canberra, Australian Capital Territory, 2601, Australia
- CSIRO Agriculture, Canberra, Australian Capital Territory, 2601, Australia
| | - Matthew P Reynolds
- International Maize and Wheat Improvement Centre (CIMMYT), México, 06600, Mexico
| | - Barry J Pogson
- ARC Centre of Excellence in Plant Energy Biology, Research School of Biology, Australian National University, Canberra, Australian Capital Territory, 2601, Australia
| | - A Harvey Millar
- ARC Centre of Excellence in Plant Energy Biology, University of Western Australia, Perth, Western Australia, 6009, Australia
| | - Robert T Furbank
- ARC Centre of Excellence for Translational Photosynthesis, Research School of Biology, Australian National University, Canberra, Australian Capital Territory, 2601, Australia
- CSIRO Agriculture, Canberra, Australian Capital Territory, 2601, Australia
| | - Owen K Atkin
- ARC Centre of Excellence in Plant Energy Biology, Research School of Biology, Australian National University, Canberra, Australian Capital Territory, 2601, Australia
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30
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Knauer J, Zaehle S, De Kauwe MG, Bahar NHA, Evans JR, Medlyn BE, Reichstein M, Werner C. Effects of mesophyll conductance on vegetation responses to elevated CO 2 concentrations in a land surface model. Glob Chang Biol 2019; 25:1820-1838. [PMID: 30809890 PMCID: PMC6487956 DOI: 10.1111/gcb.14604] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2018] [Accepted: 01/26/2019] [Indexed: 05/13/2023]
Abstract
Mesophyll conductance (gm ) is known to affect plant photosynthesis. However, gm is rarely explicitly considered in land surface models (LSMs), with the consequence that its role in ecosystem and large-scale carbon and water fluxes is poorly understood. In particular, the different magnitudes of gm across plant functional types (PFTs) are expected to cause spatially divergent vegetation responses to elevated CO2 concentrations. Here, an extensive literature compilation of gm across major vegetation types is used to parameterize an empirical model of gm in the LSM JSBACH and to adjust photosynthetic parameters based on simulated An - Ci curves. We demonstrate that an explicit representation of gm changes the response of photosynthesis to environmental factors, which cannot be entirely compensated by adjusting photosynthetic parameters. These altered responses lead to changes in the photosynthetic sensitivity to atmospheric CO2 concentrations which depend both on the magnitude of gm and the climatic conditions, particularly temperature. We then conducted simulations under ambient and elevated (ambient + 200 μmol/mol) CO2 concentrations for contrasting ecosystems and for historical and anticipated future climate conditions (representative concentration pathways; RCPs) globally. The gm -explicit simulations using the RCP8.5 scenario resulted in significantly higher increases in gross primary productivity (GPP) in high latitudes (+10% to + 25%), intermediate increases in temperate regions (+5% to + 15%), and slightly lower to moderately higher responses in tropical regions (-2% to +5%), which summed up to moderate GPP increases globally. Similar patterns were found for transpiration, but with a lower magnitude. Our results suggest that the effect of an explicit representation of gm is most important for simulated carbon and water fluxes in the boreal zone, where a cold climate coincides with evergreen vegetation.
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Affiliation(s)
- Jürgen Knauer
- Department of Biogeochemical IntegrationMax Planck Institute for BiogeochemistryJenaGermany
- International Max Planck Research School for Global Biogeochemical Cycles (IMPRS gBGC)JenaGermany
| | - Sönke Zaehle
- Department of Biogeochemical IntegrationMax Planck Institute for BiogeochemistryJenaGermany
- Michael‐Stifel Center Jena for Data‐Driven and Simulation ScienceJenaGermany
| | - Martin G. De Kauwe
- ARC Centre of Excellence for Climate Extremes and the Climate Change Research CentreUniversity of New South WalesSydneyNSWAustralia
| | - Nur H. A. Bahar
- ARC Centre of Excellence in Plant Energy Biology, Division of Plant SciencesResearch School of Biology, Australian National UniversityCanberraACTAustralia
| | - John R. Evans
- ARC Centre of Excellence for Translational Photosynthesis, Division of Plant SciencesResearch School of Biology, Australian National UniversityCanberraACTAustralia
| | - Belinda E. Medlyn
- Hawkesbury Institute for the EnvironmentWestern Sydney UniversityRichmondNSWAustralia
| | - Markus Reichstein
- Department of Biogeochemical IntegrationMax Planck Institute for BiogeochemistryJenaGermany
- Michael‐Stifel Center Jena for Data‐Driven and Simulation ScienceJenaGermany
| | - Christiane Werner
- Department of Ecosystem PhysiologyUniversity of FreiburgFreiburgGermany
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31
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Shimono H, Kondo M, Evans JR. Internal transport of CO 2 from the root-zone to plant shoot is pH dependent. Physiol Plant 2019; 165:451-463. [PMID: 29885010 DOI: 10.1111/ppl.12767] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2018] [Revised: 05/17/2018] [Accepted: 05/22/2018] [Indexed: 05/26/2023]
Abstract
We investigated the fate of carbon dioxide (CO2 ) absorbed by roots or internally produced by respiration using gas exchange and stable isotopic labeling. CO2 efflux from detached leaves supplied with bicarbonate/CO2 solutions was followed over six cycles. CO2 effluxes were detected when bicarbonate solution at high pH was used, corresponding to 71-85% of the expected efflux. No CO2 efflux was detected when CO2 solutions at low pH were used but CO2 efflux was subsequently detected as soon as bicarbonate solutions at high pH were supplied. By sealing the leaf and petiole in a plastic bag to reduce diffusion to the atmosphere, a small CO2 efflux signal (14-30% of the expected efflux) was detected suggesting that CO2 in the xylem stream can readily escape to the atmosphere before reaching the leaf. When the root-zones of intact plants were exposed to CO2 solutions, a significant efflux from leaf surface was observed (13% of the expected efflux). However, no signal was detected when roots were exposed to a high pH bicarbonate solution. Isotopic tracer experiments confirmed that CO2 supplied to the root-zone was transported through the plant and was readily lost to the atmosphere. However, little 13 C moved to the shoot when roots were exposed to bicarbonate solutions at pH 8, suggesting that bicarbonate does not pass into the xylem.
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Affiliation(s)
- Hiroyuki Shimono
- Crop Science Laboratory, Faculty of Agriculture, Iwate University, Iwate 020-8550, Japan
| | - Motohiko Kondo
- National Institute of Crop Science, Ibaraki 305-8518, Japan
| | - John R Evans
- Division of Plant Sciences, Research School of Biology, The Australian National University, Acton ACT 2601, Australia
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Abstract
Global food security depends on three main cereal crops (wheat, rice and maize) achieving and maintaining high yields, as well as increasing their future yields. Fundamental to the production of this biomass is photosynthesis. The process of photosynthesis involves a large number of proteins that together account for the majority of the nitrogen in leaves. As large amounts of nitrogen are removed in the harvested grain, this needs to be replaced either from synthetic fertilizer or biological nitrogen fixation. Knowledge about photosynthetic properties of leaves in natural ecosystems is also important, particularly when we consider the potential impacts of climate change. While the relationship between nitrogen and photosynthetic capacity of a leaf differs between species, leaf nitrogen content provides a useful way to incorporate photosynthesis into models of ecosystems and the terrestrial biosphere. This review provides a generalized nitrogen budget for a C3 leaf cell and discusses the potential for improving photosynthesis from a nitrogen perspective.
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Affiliation(s)
- John R Evans
- ARC Centre of Excellence for Translational Photosynthesis, Research School of Biology, Australian National University, Canberra, ACT, Australia
| | - Victoria C Clarke
- ARC Centre of Excellence for Translational Photosynthesis, Research School of Biology, Australian National University, Canberra, ACT, Australia
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Earles JM, Buckley TN, Brodersen CR, Busch FA, Cano FJ, Choat B, Evans JR, Farquhar GD, Harwood R, Huynh M, John GP, Miller ML, Rockwell FE, Sack L, Scoffoni C, Struik PC, Wu A, Yin X, Barbour MM. Embracing 3D Complexity in Leaf Carbon-Water Exchange. Trends Plant Sci 2019; 24:15-24. [PMID: 30309727 DOI: 10.1016/j.tplants.2018.09.005] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2018] [Revised: 09/06/2018] [Accepted: 09/11/2018] [Indexed: 06/08/2023]
Abstract
Leaves are a nexus for the exchange of water, carbon, and energy between terrestrial plants and the atmosphere. Research in recent decades has highlighted the critical importance of the underlying biophysical and anatomical determinants of CO2 and H2O transport, but a quantitative understanding of how detailed 3D leaf anatomy mediates within-leaf transport has been hindered by the lack of a consensus framework for analyzing or simulating transport and its spatial and temporal dynamics realistically, and by the difficulty of measuring within-leaf transport at the appropriate scales. We discuss how recent technological advancements now make a spatially explicit 3D leaf analysis possible, through new imaging and modeling tools that will allow us to address long-standing questions related to plant carbon-water exchange.
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Affiliation(s)
- J Mason Earles
- School of Forestry & Environmental Studies, Yale University, New Haven, CT 06511, USA; Equal contribution
| | - Thomas N Buckley
- Department of Plant Sciences, University of California Davis, CA 95916, USA; Equal contribution
| | - Craig R Brodersen
- School of Forestry & Environmental Studies, Yale University, New Haven, CT 06511, USA
| | - Florian A Busch
- Research School of Biology, Australian National University, Action, ACT 0200, Australia
| | - F Javier Cano
- Hawkesbury Institute for the Environment, Western Sydney University, Richmond, NSW 2753, Australia
| | - Brendan Choat
- Hawkesbury Institute for the Environment, Western Sydney University, Richmond, NSW 2753, Australia
| | - John R Evans
- Research School of Biology, Australian National University, Action, ACT 0200, Australia
| | - Graham D Farquhar
- Research School of Biology, Australian National University, Action, ACT 0200, Australia
| | | | - Minh Huynh
- University of Sydney, Sydney, NSW 2006, Australia
| | - Grace P John
- Department of Ecology and Evolutionary Biology, University of California Los Angeles, CA 90095, USA
| | - Megan L Miller
- College of Natural Resources, University of Idaho, Moscow, ID 83844, USA
| | - Fulton E Rockwell
- Department of Organism and Evolutionary Biology, Harvard University, Cambridge, MA 02138, USA
| | - Lawren Sack
- Department of Ecology and Evolutionary Biology, University of California Los Angeles, CA 90095, USA
| | - Christine Scoffoni
- Department of Biological Sciences, California State University Los Angeles, CA 90032, USA
| | - Paul C Struik
- Department of Plant Sciences, Wageningen University, Centre for Crop Systems Analysis, 6700 AK Wageningen, The Netherlands
| | - Alex Wu
- Centre for Plant Science, The University of Queensland, Brisbane, QLD 4072, Australia
| | - Xinyou Yin
- Department of Plant Sciences, Wageningen University, Centre for Crop Systems Analysis, 6700 AK Wageningen, The Netherlands
| | - Margaret M Barbour
- University of Sydney, Sydney, NSW 2006, Australia; www.sydney.edu.au/science/people/margaret.barbour.
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Bahar NHA, Gauthier PPG, O Sullivan OS, Brereton T, Evans JR, Atkin OK. Phosphorus deficiency alters scaling relationships between leaf gas exchange and associated traits in a wide range of contrasting Eucalyptus species. Funct Plant Biol 2018; 45:813-826. [PMID: 32291064 DOI: 10.1071/fp17134] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2017] [Accepted: 02/02/2018] [Indexed: 06/11/2023]
Abstract
Phosphorus (P) limitation is known to have substantial impacts on leaf metabolism. However, uncertainty remains around whether P deficiency alters scaling functions linking leaf metabolism to associated traits. We investigated the effect of P deficiency on leaf gas exchange and related leaf traits in 17 contrasting Eucalyptus species that exhibit inherent differences in leaf traits. Saplings were grown under controlled-environment conditions in a glasshouse, where they were subjected to minus and plus P treatments for 15 weeks. P deficiency decreased P concentrations and increased leaf mass per area (LMA) of newly-developed leaves. Rates of photosynthesis (A) and respiration (R) were also reduced in P-deficient plants compared with P-fertilised plants. By contrast, P deficiency had little effect on the temperature sensitivity of R. Irrespective of P treatment, on a log-log basis A and R scaled positively with increasing leaf nitrogen concentration [N] and negatively with increasing LMA. Although P deficiency had limited impact on A-R-LMA relationships, rates of CO2 exchange per unit N were consistently lower in P-deficient plants. Our results highlight the importance of P supply for leaf carbon metabolism and show how P deficiencies (i.e. when excluding confounding genotypic and environmental effects) can have a direct effect on commonly used leaf trait scaling relationships.
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Affiliation(s)
- Nur H A Bahar
- Division of Plant Sciences, Research School of Biology, The Australian National University, Canberra, ACT 2601, Australia
| | - Paul P G Gauthier
- Department of Geosciences, Princeton University, Princeton, NJ 08544, USA
| | - Odhran S O Sullivan
- Division of Plant Sciences, Research School of Biology, The Australian National University, Canberra, ACT 2601, Australia
| | - Thomas Brereton
- Research School of Chemistry, Australian National University, Canberra, ACT 2601, Australia
| | - John R Evans
- Division of Plant Sciences, Research School of Biology, The Australian National University, Canberra, ACT 2601, Australia
| | - Owen K Atkin
- Division of Plant Sciences, Research School of Biology, The Australian National University, Canberra, ACT 2601, Australia
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Bahar NHA, Hayes L, Scafaro AP, Atkin OK, Evans JR. Mesophyll conductance does not contribute to greater photosynthetic rate per unit nitrogen in temperate compared with tropical evergreen wet-forest tree leaves. New Phytol 2018; 218:492-505. [PMID: 29436710 DOI: 10.1111/nph.15031] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2017] [Accepted: 12/23/2017] [Indexed: 05/26/2023]
Abstract
Globally, trees originating from high-rainfall tropical regions typically exhibit lower rates of light-saturated net CO2 assimilation (A) compared with those from high-rainfall temperate environments, when measured at a common temperature. One factor that has been suggested to contribute towards lower rates of A is lower mesophyll conductance. Using a combination of leaf gas exchange and carbon isotope discrimination measurements, we estimated mesophyll conductance (gm ) of several Australian tropical and temperate wet-forest trees, grown in a common environment. Maximum Rubisco carboxylation capacity, Vcmax , was obtained from CO2 response curves. gm and the drawdown of CO2 across the mesophyll were both relatively constant. Vcmax estimated on the basis of intercellular CO2 partial pressure, Ci , was equivalent to that estimated using chloroplastic CO2 partial pressure, Cc , using 'apparent' and 'true' Rubisco Michaelis-Menten constants, respectively Having ruled out gm as a possible factor in distorting variations in A between these tropical and temperate trees, attention now needs to be focused on obtaining more detailed information about Rubisco in these species.
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Affiliation(s)
- Nur H A Bahar
- ARC Centre of Excellence in Plant Energy Biology, Division of Plant Sciences, Research School of Biology, Australian National University, Canberra, ACT, 2601, Australia
| | - Lucy Hayes
- ARC Centre of Excellence in Plant Energy Biology, Division of Plant Sciences, Research School of Biology, Australian National University, Canberra, ACT, 2601, Australia
| | - Andrew P Scafaro
- ARC Centre of Excellence in Plant Energy Biology, Division of Plant Sciences, Research School of Biology, Australian National University, Canberra, ACT, 2601, Australia
| | - Owen K Atkin
- ARC Centre of Excellence in Plant Energy Biology, Division of Plant Sciences, Research School of Biology, Australian National University, Canberra, ACT, 2601, Australia
| | - John R Evans
- ARC Centre of Excellence for Translational Photosynthesis, Division of Plant Sciences, Research School of Biology, Australian National University, Canberra, ACT, 2601, Australia
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Silva-Perez V, Molero G, Serbin SP, Condon AG, Reynolds MP, Furbank RT, Evans JR. Hyperspectral reflectance as a tool to measure biochemical and physiological traits in wheat. J Exp Bot 2018; 69:483-496. [PMID: 29309611 PMCID: PMC5853784 DOI: 10.1093/jxb/erx421] [Citation(s) in RCA: 108] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2017] [Accepted: 11/06/2017] [Indexed: 05/20/2023]
Abstract
Improving photosynthesis to raise wheat yield potential has emerged as a major target for wheat physiologists. Photosynthesis-related traits, such as nitrogen per unit leaf area (Narea) and leaf dry mass per area (LMA), require laborious, destructive, laboratory-based methods, while physiological traits underpinning photosynthetic capacity, such as maximum Rubisco activity normalized to 25 °C (Vcmax25) and electron transport rate (J), require time-consuming gas exchange measurements. The aim of this study was to assess whether hyperspectral reflectance (350-2500 nm) can be used to rapidly estimate these traits on intact wheat leaves. Predictive models were constructed using gas exchange and hyperspectral reflectance data from 76 genotypes grown in glasshouses with different nitrogen levels and/or in the field under yield potential conditions. Models were developed using half of the observed data with the remainder used for validation, yielding correlation coefficients (R2 values) of 0.62 for Vcmax25, 0.7 for J, 0.81 for SPAD, 0.89 for LMA, and 0.93 for Narea, with bias <0.7%. The models were tested on elite lines and landraces that had not been used to create the models. The bias varied between -2.3% and -5.5% while relative error of prediction was similar for SPAD but slightly greater for LMA and Narea.
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Affiliation(s)
- Viridiana Silva-Perez
- CSIRO Agriculture, Canberra, ACT, Australia
- ARC Centre of Excellence for Translational Photosynthesis, Research School of Biology, The Australian National University, Canberra, ACT, Australia
| | - Gemma Molero
- International Maize and Wheat Improvement Centre (CIMMYT), México, DF, Mexico
| | - Shawn P Serbin
- Environmental, and Climate Sciences Department, Brookhaven National Laboratory, Upton, NY, USA
| | - Anthony G Condon
- CSIRO Agriculture, Canberra, ACT, Australia
- ARC Centre of Excellence for Translational Photosynthesis, Research School of Biology, The Australian National University, Canberra, ACT, Australia
| | - Matthew P Reynolds
- International Maize and Wheat Improvement Centre (CIMMYT), México, DF, Mexico
| | - Robert T Furbank
- CSIRO Agriculture, Canberra, ACT, Australia
- ARC Centre of Excellence for Translational Photosynthesis, Research School of Biology, The Australian National University, Canberra, ACT, Australia
| | - John R Evans
- ARC Centre of Excellence for Translational Photosynthesis, Research School of Biology, The Australian National University, Canberra, ACT, Australia
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Evans JR, Morgan PB, von Caemmerer S. Light Quality Affects Chloroplast Electron Transport Rates Estimated from Chl Fluorescence Measurements. Plant Cell Physiol 2017; 58:1652-1660. [PMID: 29016964 DOI: 10.1093/pcp/pcx103] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/06/2017] [Accepted: 07/09/2017] [Indexed: 05/23/2023]
Abstract
Chl fluorescence has been used widely to calculate photosynthetic electron transport rates. Portable photosynthesis instruments allow for combined measurements of gas exchange and Chl fluorescence. We analyzed the influence of spectral quality of actinic light on Chl fluorescence and the calculated electron transport rate, and compared this with photosynthetic rates measured by gas exchange in the absence of photorespiration. In blue actinic light, the electron transport rate calculated from Chl fluorescence overestimated the true rate by nearly a factor of two, whereas there was closer agreement under red light. This was consistent with the prediction made with a multilayer leaf model using profiles of light absorption and photosynthetic capacity. Caution is needed when interpreting combined measurements of Chl fluorescence and gas exchange, such as the calculation of CO2 partial pressure in leaf chloroplasts.
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Affiliation(s)
- John R Evans
- Australian Research Council Centre of Excellence for Translational Photosynthesis, Division of Plant Sciences, Research School of Biology, The Australian National University, Acton, ACT 2601, Australia
| | - Patrick B Morgan
- LI-COR Inc., Lincoln, NE 68504, USA
- School of Natural Resources, University of Nebraska-Lincoln, Lincoln, NE 68504, USA
| | - Susanne von Caemmerer
- Australian Research Council Centre of Excellence for Translational Photosynthesis, Division of Plant Sciences, Research School of Biology, The Australian National University, Acton, ACT 2601, Australia
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Nguyen HT, Meir P, Sack L, Evans JR, Oliveira RS, Ball MC. Leaf water storage increases with salinity and aridity in the mangrove Avicennia marina: integration of leaf structure, osmotic adjustment and access to multiple water sources. Plant Cell Environ 2017; 40:1576-1591. [PMID: 28382635 DOI: 10.1111/pce.12962] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2016] [Revised: 03/17/2017] [Accepted: 03/28/2017] [Indexed: 05/20/2023]
Abstract
Leaf structure and water relations were studied in a temperate population of Avicennia marina subsp. australasica along a natural salinity gradient [28 to 49 parts per thousand (ppt)] and compared with two subspecies grown naturally in similar soil salinities to those of subsp. australasica but under different climates: subsp. eucalyptifolia (salinity 30 ppt, wet tropics) and subsp. marina (salinity 46 ppt, arid tropics). Leaf thickness, leaf dry mass per area and water content increased with salinity and aridity. Turgor loss point declined with increase in soil salinity, driven mainly by differences in osmotic potential at full turgor. Nevertheless, a high modulus of elasticity (ε) contributed to maintenance of high cell hydration at turgor loss point. Despite similarity among leaves in leaf water storage capacitance, total leaf water storage increased with increasing salinity and aridity. The time that stored water alone could sustain an evaporation rate of 1 mmol m-2 s-1 ranged from 77 to 126 min from subspecies eucalyptifolia to ssp. marina, respectively. Achieving full leaf hydration or turgor would require water from sources other than the roots, emphasizing the importance of multiple water sources to growth and survival of Avicennia marina across gradients in salinity and aridity.
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Affiliation(s)
- Hoa T Nguyen
- Plant Science Division, Research School of Biology, The Australian National University, Acton, Australian Capital Territory, 2601, Australia
- Department of Botany, Faculty of Agronomy, Vietnam National University of Agriculture, Trau Quy, Gia Lam, Hanoi, 131000, Vietnam
| | - Patrick Meir
- Plant Science Division, Research School of Biology, The Australian National University, Acton, Australian Capital Territory, 2601, Australia
- School of GeoSciences, University of Edinburgh, Crew Building, West Mains Road, Edinburgh, EH9 3JN, UK
| | - Lawren Sack
- Department of Ecology and Evolution, University of California Los Angeles, 621 Charles E. Young Drive South, Los Angeles, CA, 90095, USA
| | - John R Evans
- Plant Science Division, Research School of Biology, The Australian National University, Acton, Australian Capital Territory, 2601, Australia
| | - Rafael S Oliveira
- Department of Plant Biology, Institute of Biology, University of Campinas - UNICAMP, CP6109, Campinas, São Paulo, Brazil
| | - Marilyn C Ball
- Plant Science Division, Research School of Biology, The Australian National University, Acton, Australian Capital Territory, 2601, Australia
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Silva-Pérez V, Furbank RT, Condon AG, Evans JR. Biochemical model of C 3 photosynthesis applied to wheat at different temperatures. Plant Cell Environ 2017; 40:1552-1564. [PMID: 28338213 DOI: 10.1111/pce.12953] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/21/2016] [Revised: 02/26/2017] [Accepted: 03/06/2017] [Indexed: 05/23/2023]
Abstract
We examined the effects of leaf temperature on the estimation of maximal Rubisco capacity (Vcmax ) from gas exchange measurements of wheat leaves using a C3 photosynthesis model. Cultivars of spring wheat (Triticum aestivum (L)) and triticale (X Triticosecale Wittmack) were grown in a greenhouse or in the field and measured at a range of temperatures under controlled conditions in a growth cabinet (2 and 21% O2 ) or in the field using natural diurnal variation in temperature, respectively. Published Rubisco kinetic constants for tobacco did not describe the observed CO2 response curves well as temperature varied. By assuming values for the Rubisco Michaelis-Menten constants for CO2 (Kc ) and O2 (Ko ) at 25 °C derived from tobacco and the activation energies of Vcmax from wheat and respiration in the light, Rd , from tobacco, we derived activation energies for Kc and Ko (93.7 and 33.6 kJ mol-1 , respectively) that considerably improved the fit of the model to observed data. We confirmed that temperature dependence of dark respiration for wheat was well described by the activation energy for Rd from tobacco. The new parameters improved the estimation of Vcmax under field conditions, where temperatures increased through the day.
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Affiliation(s)
- Viridiana Silva-Pérez
- CSIRO Agriculture and Food, PO Box 1700, Canberra, Australian Capital Territory, 2601, Australia
| | - Robert T Furbank
- Plant Science Division, Research School of Biology, The Australian National University, Canberra, Australian Capital Territory, 2601, Australia
| | - Anthony G Condon
- CSIRO Agriculture and Food, PO Box 1700, Canberra, Australian Capital Territory, 2601, Australia
| | - John R Evans
- Plant Science Division, Research School of Biology, The Australian National University, Canberra, Australian Capital Territory, 2601, Australia
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Scafaro AP, Xiang S, Long BM, Bahar NHA, Weerasinghe LK, Creek D, Evans JR, Reich PB, Atkin OK. Strong thermal acclimation of photosynthesis in tropical and temperate wet-forest tree species: the importance of altered Rubisco content. Glob Chang Biol 2017; 23:2783-2800. [PMID: 27859952 DOI: 10.1111/gcb.13566] [Citation(s) in RCA: 64] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2016] [Accepted: 10/16/2016] [Indexed: 05/09/2023]
Abstract
Understanding of the extent of acclimation of light-saturated net photosynthesis (An ) to temperature (T), and associated underlying mechanisms, remains limited. This is a key knowledge gap given the importance of thermal acclimation for plant functioning, both under current and future higher temperatures, limiting the accuracy and realism of Earth system model (ESM) predictions. Given this, we analysed and modelled T-dependent changes in photosynthetic capacity in 10 wet-forest tree species: six from temperate forests and four from tropical forests. Temperate and tropical species were each acclimated to three daytime growth temperatures (Tgrowth ): temperate - 15, 20 and 25 °C; tropical - 25, 30 and 35 °C. CO2 response curves of An were used to model maximal rates of RuBP (ribulose-1,5-bisphosphate) carboxylation (Vcmax ) and electron transport (Jmax ) at each treatment's respective Tgrowth and at a common measurement T (25 °C). SDS-PAGE gels were used to determine abundance of the CO2 -fixing enzyme, Rubisco. Leaf chlorophyll, nitrogen (N) and mass per unit leaf area (LMA) were also determined. For all species and Tgrowth , An at current atmospheric CO2 partial pressure was Rubisco-limited. Across all species, LMA decreased with increasing Tgrowth . Similarly, area-based rates of Vcmax at a measurement T of 25 °C (Vcmax25 ) linearly declined with increasing Tgrowth , linked to a concomitant decline in total leaf protein per unit leaf area and Rubisco as a percentage of leaf N. The decline in Rubisco constrained Vcmax and An for leaves developed at higher Tgrowth and resulted in poor predictions of photosynthesis by currently widely used models that do not account for Tgrowth -mediated changes in Rubisco abundance that underpin the thermal acclimation response of photosynthesis in wet-forest tree species. A new model is proposed that accounts for the effect of Tgrowth -mediated declines in Vcmax25 on An , complementing current photosynthetic thermal acclimation models that do not account for T sensitivity of Vcmax25 .
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Affiliation(s)
- Andrew P Scafaro
- ARC Centre of Excellence in Plant Energy Biology, Research School of Biology, The Australian National University, Building 134, Canberra, ACT, 2601, Australia
| | - Shuang Xiang
- Chengdu Institute of Biology, Chinese Academy of Sciences, No. 9, Section 4, Renmin South Road, Chengdu, Sichuan, 610041, China
- Division of Plant Sciences, Research School of Biology, The Australian National University, Building 46, Canberra, ACT, 2601, Australia
| | - Benedict M Long
- Division of Plant Sciences, Research School of Biology, The Australian National University, Building 46, Canberra, ACT, 2601, Australia
- ARC Centre of Excellence for Translational Photosynthesis, Research School of Biology, The Australian National University, Building 134, Canberra, ACT, 2601, Australia
| | - Nur H A Bahar
- ARC Centre of Excellence in Plant Energy Biology, Research School of Biology, The Australian National University, Building 134, Canberra, ACT, 2601, Australia
| | | | - Danielle Creek
- Hawkesbury Institute for the Environment, Western Sydney University, Penrith, NSW, 2751, Australia
| | - John R Evans
- Division of Plant Sciences, Research School of Biology, The Australian National University, Building 46, Canberra, ACT, 2601, Australia
- ARC Centre of Excellence for Translational Photosynthesis, Research School of Biology, The Australian National University, Building 134, Canberra, ACT, 2601, Australia
| | - Peter B Reich
- Hawkesbury Institute for the Environment, Western Sydney University, Penrith, NSW, 2751, Australia
- Department of Forest Resources, University of Minnesota, 1540 Cleveland Avenue North, St. Paul, MN, 55108, USA
| | - Owen K Atkin
- ARC Centre of Excellence in Plant Energy Biology, Research School of Biology, The Australian National University, Building 134, Canberra, ACT, 2601, Australia
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Groszmann M, Osborn HL, Evans JR. Carbon dioxide and water transport through plant aquaporins. Plant Cell Environ 2017; 40:938-961. [PMID: 27739588 DOI: 10.1111/pce.12844] [Citation(s) in RCA: 71] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2016] [Revised: 09/01/2016] [Accepted: 09/22/2016] [Indexed: 05/25/2023]
Abstract
Aquaporins are channel proteins that function to increase the permeability of biological membranes. In plants, aquaporins are encoded by multigene families that have undergone substantial diversification in land plants. The plasma membrane intrinsic proteins (PIPs) subfamily of aquaporins is of particular interest given their potential to improve plant water relations and photosynthesis. Flowering plants have between 7 and 28 PIP genes. Their expression varies with tissue and cell type, through development and in response to a variety of factors, contributing to the dynamic and tissue specific control of permeability. There are a growing number of PIPs shown to act as water channels, but those altering membrane permeability to CO2 are more limited. The structural basis for selective substrate specificities has not yet been resolved, although a few key amino acid positions have been identified. Several regions important for dimerization, gating and trafficking are also known. PIP aquaporins assemble as tetramers and their properties depend on the monomeric composition. PIPs control water flux into and out of veins and stomatal guard cells and also increase membrane permeability to CO2 in mesophyll and stomatal guard cells. The latter increases the effectiveness of Rubisco and can potentially influence transpiration efficiency.
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Affiliation(s)
- Michael Groszmann
- Australian Research Council Centre of Excellence for Translational Photosynthesis, Division of Plant Sciences, Research School of Biology, The Australian National University, Acton, ACT, 2601, Australia
| | - Hannah L Osborn
- Australian Research Council Centre of Excellence for Translational Photosynthesis, Division of Plant Sciences, Research School of Biology, The Australian National University, Acton, ACT, 2601, Australia
| | - John R Evans
- Australian Research Council Centre of Excellence for Translational Photosynthesis, Division of Plant Sciences, Research School of Biology, The Australian National University, Acton, ACT, 2601, Australia
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Zhao M, Tan HT, Scharwies J, Levin K, Evans JR, Tyerman SD. Association between water and carbon dioxide transport in leaf plasma membranes: assessing the role of aquaporins. Plant Cell Environ 2017; 40:789-801. [PMID: 27620674 DOI: 10.1111/pce.12830] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/11/2016] [Revised: 09/05/2016] [Accepted: 09/07/2016] [Indexed: 05/24/2023]
Abstract
The role of some aquaporins as CO2 permeable channels has been controversial. Low CO2 permeability of plant membranes has been criticized because of unstirred layers and other limitations. Here we measured both water and CO2 permeability (Pos , PCO2 ) using stopped flow on plasma membrane vesicles (pmv) isolated from Pisum sativum (pea) and Arabidopsis thaliana leaves. We excluded the chemical limitation of carbonic anhydrase (CA) in the vesicle acidification technique for PCO2 using different temperatures and CA concentrations. Unstirred layers were excluded based on small vesicle size and the positive correlation between vesicle diameter and PCO2 . We observed high aquaporin activity (Pos 0.06 to 0.22 cm s-1 ) for pea pmv based on all the criteria for their function using inhibitors and temperature dependence. Inhibitors of Pos did not alter PCO2 . PCO2 ranged from 0.001 to 0.012 cm s-1 (mean 0.0079 + 0.0007 cm s-1 ) with activation energy of 30.2 kJ mol-1 . Intrinsic variation between pmv batches from normally grown or stressed plants revealed a weak (R2 = 0.27) positive linear correlation between Pos and PCO2 . Despite the low PCO2 , aquaporins may facilitate CO2 transport across plasma membranes, but probably via a different pathway than for water.
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Affiliation(s)
- Manchun Zhao
- Australian Research Council Centre of Excellence in Plant Energy Biology, School of Agriculture, Food and Wine, Waite Research Institute, University of Adelaide, Glen Osmond, South Australia, 5064, Australia
| | - Hwei-Ting Tan
- Australian Research Council Centre of Excellence in Plant Energy Biology, School of Agriculture, Food and Wine, Waite Research Institute, University of Adelaide, Glen Osmond, South Australia, 5064, Australia
| | - Johannes Scharwies
- Australian Research Council Centre of Excellence in Plant Energy Biology, School of Agriculture, Food and Wine, Waite Research Institute, University of Adelaide, Glen Osmond, South Australia, 5064, Australia
| | - Kara Levin
- Australian Research Council Centre of Excellence in Plant Energy Biology, School of Agriculture, Food and Wine, Waite Research Institute, University of Adelaide, Glen Osmond, South Australia, 5064, Australia
| | - John R Evans
- Division of Plant Sciences, Research School of Biology, The Australian National University, Canberra, Australian Capital Territory, 0200, Australia
| | - Stephen D Tyerman
- Australian Research Council Centre of Excellence in Plant Energy Biology, School of Agriculture, Food and Wine, Waite Research Institute, University of Adelaide, Glen Osmond, South Australia, 5064, Australia
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Onoda Y, Wright IJ, Evans JR, Hikosaka K, Kitajima K, Niinemets Ü, Poorter H, Tosens T, Westoby M. Physiological and structural tradeoffs underlying the leaf economics spectrum. New Phytol 2017; 214:1447-1463. [PMID: 28295374 DOI: 10.1111/nph.14496] [Citation(s) in RCA: 239] [Impact Index Per Article: 34.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2016] [Accepted: 01/23/2017] [Indexed: 05/18/2023]
Abstract
The leaf economics spectrum (LES) represents a suite of intercorrelated leaf traits concerning construction costs per unit leaf area, nutrient concentrations, and rates of carbon fixation and tissue turnover. Although broad trade-offs among leaf structural and physiological traits have been demonstrated, we still do not have a comprehensive view of the fundamental constraints underlying the LES trade-offs. Here, we investigated physiological and structural mechanisms underpinning the LES by analysing a novel data compilation incorporating rarely considered traits such as the dry mass fraction in cell walls, nitrogen allocation, mesophyll CO2 diffusion and associated anatomical traits for hundreds of species covering major growth forms. The analysis demonstrates that cell wall constituents are major components of leaf dry mass (18-70%), especially in leaves with high leaf mass per unit area (LMA) and long lifespan. A greater fraction of leaf mass in cell walls is typically associated with a lower fraction of leaf nitrogen (N) invested in photosynthetic proteins; and lower within-leaf CO2 diffusion rates, as a result of thicker mesophyll cell walls. The costs associated with greater investments in cell walls underpin the LES: long leaf lifespans are achieved via higher LMA and in turn by higher cell wall mass fraction, but this inevitably reduces the efficiency of photosynthesis.
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Affiliation(s)
- Yusuke Onoda
- Graduate School of Agriculture, Kyoto University, Kyoto, 606-8502, Japan
| | - Ian J Wright
- Department of Biological Sciences, Macquarie University, Sydney, NSW, 2109, Australia
| | - John R Evans
- Division of Plant Sciences, Research School of Biology, The Australian National University, Canberra, ACT, 0200, Australia
| | - Kouki Hikosaka
- Graduate School of Life Sciences, Tohoku University, Aoba, Sendai, 980-8578, Japan
| | - Kaoru Kitajima
- Graduate School of Agriculture, Kyoto University, Kyoto, 606-8502, Japan
| | - Ülo Niinemets
- Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Tartu, 51014, Estonia
| | - Hendrik Poorter
- Plant Sciences (IBG-2), Forschungszentrum Jülich GmbH, D-52425, Jülich, Germany
| | - Tiina Tosens
- Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Tartu, 51014, Estonia
| | - Mark Westoby
- Department of Biological Sciences, Macquarie University, Sydney, NSW, 2109, Australia
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45
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Bahar NHA, Ishida FY, Weerasinghe LK, Guerrieri R, O'Sullivan OS, Bloomfield KJ, Asner GP, Martin RE, Lloyd J, Malhi Y, Phillips OL, Meir P, Salinas N, Cosio EG, Domingues TF, Quesada CA, Sinca F, Escudero Vega A, Zuloaga Ccorimanya PP, Del Aguila-Pasquel J, Quispe Huaypar K, Cuba Torres I, Butrón Loayza R, Pelaez Tapia Y, Huaman Ovalle J, Long BM, Evans JR, Atkin OK. Leaf-level photosynthetic capacity in lowland Amazonian and high-elevation Andean tropical moist forests of Peru. New Phytol 2017; 214:1002-1018. [PMID: 27389684 DOI: 10.1111/nph.14079] [Citation(s) in RCA: 54] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2015] [Accepted: 05/23/2016] [Indexed: 05/24/2023]
Abstract
We examined whether variations in photosynthetic capacity are linked to variations in the environment and/or associated leaf traits for tropical moist forests (TMFs) in the Andes/western Amazon regions of Peru. We compared photosynthetic capacity (maximal rate of carboxylation of Rubisco (Vcmax ), and the maximum rate of electron transport (Jmax )), leaf mass, nitrogen (N) and phosphorus (P) per unit leaf area (Ma , Na and Pa , respectively), and chlorophyll from 210 species at 18 field sites along a 3300-m elevation gradient. Western blots were used to quantify the abundance of the CO2 -fixing enzyme Rubisco. Area- and N-based rates of photosynthetic capacity at 25°C were higher in upland than lowland TMFs, underpinned by greater investment of N in photosynthesis in high-elevation trees. Soil [P] and leaf Pa were key explanatory factors for models of area-based Vcmax and Jmax but did not account for variations in photosynthetic N-use efficiency. At any given Na and Pa , the fraction of N allocated to photosynthesis was higher in upland than lowland species. For a small subset of lowland TMF trees examined, a substantial fraction of Rubisco was inactive. These results highlight the importance of soil- and leaf-P in defining the photosynthetic capacity of TMFs, with variations in N allocation and Rubisco activation state further influencing photosynthetic rates and N-use efficiency of these critically important forests.
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Affiliation(s)
- Nur H A Bahar
- Division of Plant Sciences, Research School of Biology, The Australian National University, Canberra, ACT, 2601, Australia
| | - F Yoko Ishida
- Centre for Tropical Environmental and Sustainability Science, College of Marine and Environmental Sciences, James Cook University, Cairns, Qld, Australia
| | - Lasantha K Weerasinghe
- Division of Plant Sciences, Research School of Biology, The Australian National University, Canberra, ACT, 2601, Australia
- Faculty of Agriculture, University of Peradeniya, Peradeniya, 20400, Sri Lanka
| | - Rossella Guerrieri
- Centre for Ecological Research and Forestry Applications (CREAF), Universidad Autonoma de Barcelona, Edificio C, 08290, Cerdanyola, Barcelona Spain
- School of Geosciences, University of Edinburgh, Edinburgh, EH9 3JN, UK
| | - Odhran S O'Sullivan
- Division of Plant Sciences, Research School of Biology, The Australian National University, Canberra, ACT, 2601, Australia
| | - Keith J Bloomfield
- Division of Plant Sciences, Research School of Biology, The Australian National University, Canberra, ACT, 2601, Australia
| | - Gregory P Asner
- Department of Global Ecology, Carnegie Institution for Science, Stanford, CA, 94305, USA
| | - Roberta E Martin
- Department of Global Ecology, Carnegie Institution for Science, Stanford, CA, 94305, USA
| | - Jon Lloyd
- Centre for Tropical Environmental and Sustainability Science, College of Marine and Environmental Sciences, James Cook University, Cairns, Qld, Australia
- Department of Life Sciences, Imperial College London, Silwood Park Campus, Ascot, SL5 7PY, UK
| | - Yadvinder Malhi
- Environmental Change Institute, School of Geography and the Environment, University of Oxford, South Parks Road, Oxford, OX1 3QY, UK
| | - Oliver L Phillips
- School of Geography, University of Leeds, Woodhouse Lane, Leeds, LS9 2JT, UK
| | - Patrick Meir
- Division of Plant Sciences, Research School of Biology, The Australian National University, Canberra, ACT, 2601, Australia
- School of Geosciences, University of Edinburgh, Edinburgh, EH9 3JN, UK
| | - Norma Salinas
- Environmental Change Institute, School of Geography and the Environment, University of Oxford, South Parks Road, Oxford, OX1 3QY, UK
- Seccion Quimica, Pontificia Universidad Católica del Perú, Av Universitaria 1801, San Miguel, Lima, Perú
| | - Eric G Cosio
- Seccion Quimica, Pontificia Universidad Católica del Perú, Av Universitaria 1801, San Miguel, Lima, Perú
| | - Tomas F Domingues
- Faculdade de Filosofia Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Sao Paulo, Brazil
| | - Carlos A Quesada
- Instituto Nacional de Pesquisas da Amazonia (INPA), Manaus, Brazil
| | - Felipe Sinca
- Department of Global Ecology, Carnegie Institution for Science, Stanford, CA, 94305, USA
| | - Alberto Escudero Vega
- Seccion Quimica, Pontificia Universidad Católica del Perú, Av Universitaria 1801, San Miguel, Lima, Perú
| | - Paola P Zuloaga Ccorimanya
- Escuela Profesional de Biologia, Universidad Nacional de San Antonio Abad del Cusco, Av de la Cultura, No. 733, Cusco, Perú
| | - Jhon Del Aguila-Pasquel
- Instituto de Investigaciones de la Amazonia Peruana (IIAP), Av. José A. Quiñones km. 2.5, Apartado Postal 784, Iquitos, Perú
- School of Forest Resources and Environmental Science, Michigan Technological University, 1400 Townsend Drive, Houghton, MI, 49931, USA
| | - Katherine Quispe Huaypar
- Escuela Profesional de Biologia, Universidad Nacional de San Antonio Abad del Cusco, Av de la Cultura, No. 733, Cusco, Perú
| | - Israel Cuba Torres
- Escuela Profesional de Biologia, Universidad Nacional de San Antonio Abad del Cusco, Av de la Cultura, No. 733, Cusco, Perú
| | - Rosalbina Butrón Loayza
- Museo de Historia Natural, Universidad Nacional de San Antonio Abad del Cusco, Av de la Cultura, No. 733, Cusco, Perú
| | - Yulina Pelaez Tapia
- Escuela Profesional de Biologia, Universidad Nacional de San Antonio Abad del Cusco, Av de la Cultura, No. 733, Cusco, Perú
| | - Judit Huaman Ovalle
- Escuela Profesional de Biologia, Universidad Nacional de San Antonio Abad del Cusco, Av de la Cultura, No. 733, Cusco, Perú
| | - Benedict M Long
- Division of Plant Sciences, Research School of Biology, The Australian National University, Canberra, ACT, 2601, Australia
- ARC Centre of Excellence for Translational Photosynthesis, Research School of Biology, The Australian National University, Building 134, Canberra, ACT, 2601, Australia
| | - John R Evans
- Division of Plant Sciences, Research School of Biology, The Australian National University, Canberra, ACT, 2601, Australia
- ARC Centre of Excellence for Translational Photosynthesis, Research School of Biology, The Australian National University, Building 134, Canberra, ACT, 2601, Australia
| | - Owen K Atkin
- Division of Plant Sciences, Research School of Biology, The Australian National University, Canberra, ACT, 2601, Australia
- ARC Centre of Excellence in Plant Energy Biology, Research School of Biology, The Australian National University, Building 134, Canberra, ACT, 2601, Australia
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Spicer LJ, Schütz LF, Williams JA, Schreiber NB, Evans JR, Totty ML, Gilliam JN. G protein-coupled receptor 34 in ovarian granulosa cells of cattle: changes during follicular development and potential functional implications. Domest Anim Endocrinol 2017; 59:90-99. [PMID: 28040605 PMCID: PMC5357439 DOI: 10.1016/j.domaniend.2016.12.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/19/2016] [Revised: 11/30/2016] [Accepted: 12/01/2016] [Indexed: 01/08/2023]
Abstract
Abundance of G protein-coupled receptor 34 (GPR34) mRNA is greater in granulosa cells (GCs) of cystic vs normal follicles of cattle. The present experiments were designed to determine if GPR34 mRNA in granulosa cell [GC] changes during selection and growth of dominant follicles in cattle as well as to investigate the hormonal regulation of GPR34 mRNA in bovine GC in vitro. In Exp. 1, estrous cycles of nonlactating cows were synchronized and then ovariectomized on either day 3-4 or 5-6 after ovulation. GPR34 mRNA abundance in GC was 2.8- to 3.8-fold greater (P < 0.05) in small (1-5 mm) and large (≥8 mm) estrogen-inactive dominant follicles than in large estrogen-active follicles. Also, GPR34 mRNA tended to be greater (P < 0.10) in F2 than F1 follicles on day 3-4 postovulation. In Exp. 2-7, ovaries were collected at an abattoir and GC were isolated and treated in vitro. Expression of GPR34 was increased (P < 0.05) 2.2-fold by IGF1. Tumor necrosis factor (TNF)-α decreased (P < 0.05) the IGF1-induced GPR34 mRNA abundance in small-follicle GC, whereas IGF1 decreased (P < 0.05) GPR34 expression by 45% in large-follicle GC. Treatment of small-follicle GC with either IL-2, prostaglandin E2 or angiogenin decreased (P < 0.05) GPR34 expression, whereas FSH, cortisol, wingless 3A, or hedgehog proteins did not affect (P > 0.10) GPR34 expression. In Exp. 6 and 7, 2 presumed ligands of GPR34, L-a-lysophosphatidylserine (LPPS) and LPP-ethanolamine, increased (P < 0.05) GC numbers and estradiol production by 2-fold or more in small-follicle GC, and this response was only observed in IGF1-treated GC. In conclusion, GPR34 is a developmentally and hormonally regulated gene in GC, and its presumed ligands enhance IGF1-induced proliferation and steroidogenesis of bovine GC.
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Affiliation(s)
- L J Spicer
- Department of Animal Science, Oklahoma State University, Stillwater, OK 74078, USA.
| | - L F Schütz
- Department of Animal Science, Oklahoma State University, Stillwater, OK 74078, USA
| | - J A Williams
- Department of Animal Science, Oklahoma State University, Stillwater, OK 74078, USA
| | - N B Schreiber
- Department of Animal Science, Oklahoma State University, Stillwater, OK 74078, USA
| | - J R Evans
- Department of Animal Science, Oklahoma State University, Stillwater, OK 74078, USA
| | - M L Totty
- Department of Animal Science, Oklahoma State University, Stillwater, OK 74078, USA
| | - J N Gilliam
- Department of Veterinary Clinical Sciences, Oklahoma State University, Stillwater, OK 74078, USA
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Osborn HL, Alonso-Cantabrana H, Sharwood RE, Covshoff S, Evans JR, Furbank RT, von Caemmerer S. Effects of reduced carbonic anhydrase activity on CO2 assimilation rates in Setaria viridis: a transgenic analysis. J Exp Bot 2017; 68:299-310. [PMID: 27702996 PMCID: PMC5853810 DOI: 10.1093/jxb/erw357] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2016] [Accepted: 09/05/2016] [Indexed: 05/22/2023]
Abstract
In C4 species, the major β-carbonic anhydrase (β-CA) localized in the mesophyll cytosol catalyses the hydration of CO2 to HCO3-, which phosphoenolpyruvate carboxylase uses in the first step of C4 photosynthesis. To address the role of CA in C4 photosynthesis, we generated transgenic Setaria viridis depleted in β-CA. Independent lines were identified with as little as 13% of wild-type CA. No photosynthetic defect was observed in the transformed lines at ambient CO2 partial pressure (pCO2). At low pCO2, a strong correlation between CO2 assimilation rates and CA hydration rates was observed. C18O16O isotope discrimination was used to estimate the mesophyll conductance to CO2 diffusion from the intercellular air space to the mesophyll cytosol (gm) in control plants, which allowed us to calculate CA activities in the mesophyll cytosol (Cm). This revealed a strong relationship between the initial slope of the response of the CO2 assimilation rate to cytosolic pCO2 (ACm) and cytosolic CA activity. However, the relationship between the initial slope of the response of CO2 assimilation to intercellular pCO2 (ACi) and cytosolic CA activity was curvilinear. This indicated that in S. viridis, mesophyll conductance may be a contributing limiting factor alongside CA activity to CO2 assimilation rates at low pCO2.
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Affiliation(s)
- Hannah L Osborn
- Australian Research Council Centre of Excellence for Translational Photosynthesis, Division of Plant Sciences, Research School of Biology, The Australian National University, Acton, ACT 2601, Australia
| | - Hugo Alonso-Cantabrana
- Australian Research Council Centre of Excellence for Translational Photosynthesis, Division of Plant Sciences, Research School of Biology, The Australian National University, Acton, ACT 2601, Australia
| | - Robert E Sharwood
- Australian Research Council Centre of Excellence for Translational Photosynthesis, Division of Plant Sciences, Research School of Biology, The Australian National University, Acton, ACT 2601, Australia
| | - Sarah Covshoff
- Department of Plant Sciences, University of Cambridge, Cambridge CB2 3EA, UK
| | - John R Evans
- Australian Research Council Centre of Excellence for Translational Photosynthesis, Division of Plant Sciences, Research School of Biology, The Australian National University, Acton, ACT 2601, Australia
| | - Robert T Furbank
- Australian Research Council Centre of Excellence for Translational Photosynthesis, Division of Plant Sciences, Research School of Biology, The Australian National University, Acton, ACT 2601, Australia
| | - Susanne von Caemmerer
- Australian Research Council Centre of Excellence for Translational Photosynthesis, Division of Plant Sciences, Research School of Biology, The Australian National University, Acton, ACT 2601, Australia
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Schütz LF, Schreiber NB, Gilliam JN, Cortinovis C, Totty ML, Caloni F, Evans JR, Spicer LJ. Changes in fibroblast growth factor 9 mRNA in granulosa and theca cells during ovarian follicular growth in dairy cattle. J Dairy Sci 2016; 99:9143-9151. [PMID: 27614836 DOI: 10.3168/jds.2015-10667] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2015] [Accepted: 07/27/2016] [Indexed: 11/19/2022]
Abstract
Fibroblast growth factor 9 (FGF9) has been suggested to act as an antidifferentiation factor in cattle by reducing steroidogenesis and increasing cell proliferation in granulosa (GC) and theca (TC) cells. The objective of this study was to characterize FGF9 mRNA abundance in GC and TC during development of dominant follicles in dairy cattle. Estrous cycles of nonlactating dairy cattle were synchronized, and ovaries were collected on either d 3 to 4 (n=8) or 5 to 6 (n=8) postovulation for GC and TC RNA extraction from small (1-5mm), medium (5.1-8mm), and large (8.1-18mm) follicles for PCR analysis. The FGF9 mRNA abundance was greater in GC than in TC. In GC, FGF9 mRNA abundance was greater in small, medium, and large estrogen-inactive [i.e., concentrations of estradiol (E2)<progesterone (P4)] follicles than in large E2-active (i.e., concentrations of E2>P4) follicles at both early (d 3-4) and late (d 5-6) growing phases of first dominant follicle. Abundance of FGF9 mRNA increased in medium-sized follicles from early to late growing phase of the dominant follicle. In TC, FGF9 mRNA abundance was greater in large E2-inactive follicles than in large E2-active follicles on d 3 to 4 postovulation; no significant differences in TC FGF9 mRNA existed among follicle types on d 5 to 6 postovulation. Correlations among levels of follicular fluid hormones and FGF9 mRNA levels revealed significant negative correlations between GC FGF9 mRNA abundance and follicular fluid E2 (r=-0.68), free IGF-1 (r=-0.63), and E2-to-P4 ratio (r=-0.58). In summary, abundance of FGF9 mRNA in GC and TC increases in medium-sized follicles during development of dominant follicles and is less in dominant E2-active than subordinate E2-inactive follicles, suggesting that FGF9 signaling could contribute to normal follicle development and steroidogenesis in dairy cattle.
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Affiliation(s)
- L F Schütz
- Department of Animal Science, Oklahoma State University, Stillwater 74078
| | - N B Schreiber
- Department of Animal Science, Oklahoma State University, Stillwater 74078
| | - J N Gilliam
- Department of Veterinary Clinical Sciences, Oklahoma State University, Stillwater 74078
| | - C Cortinovis
- Università degli Studi di Milano, Department of Health, Animal Science and Food Safety, Via Celoria 10, 20133 Milan, Italy
| | - M L Totty
- Department of Animal Science, Oklahoma State University, Stillwater 74078
| | - F Caloni
- Università degli Studi di Milano, Department of Health, Animal Science and Food Safety, Via Celoria 10, 20133 Milan, Italy
| | - J R Evans
- Department of Animal Science, Oklahoma State University, Stillwater 74078
| | - L J Spicer
- Department of Animal Science, Oklahoma State University, Stillwater 74078.
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49
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Barbour MM, Evans JR, Simonin KA, von Caemmerer S. Online CO2 and H2 O oxygen isotope fractionation allows estimation of mesophyll conductance in C4 plants, and reveals that mesophyll conductance decreases as leaves age in both C4 and C3 plants. New Phytol 2016; 210:875-89. [PMID: 26778088 DOI: 10.1111/nph.13830] [Citation(s) in RCA: 72] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2015] [Accepted: 11/30/2015] [Indexed: 05/09/2023]
Abstract
Mesophyll conductance significantly, and variably, limits photosynthesis but we currently have no reliable method of measurement for C4 plants. An online oxygen isotope technique was developed to allow quantification of mesophyll conductance in C4 plants and to provide an alternative estimate in C3 plants. The technique is compared to an established carbon isotope method in three C3 species. Mesophyll conductance of C4 species was similar to that in the C3 species measured, and declined in both C4 and C3 species as leaves aged from fully expanded to senescing. In cotton leaves, simultaneous measurement of carbon and oxygen isotope discrimination allowed the partitioning of total conductance to the chloroplasts into cell wall and plasma membrane versus chloroplast membrane components, if CO2 was assumed to be isotopically equilibrated with cytosolic water, and the partitioning remained stable with leaf age. The oxygen isotope technique allowed estimation of mesophyll conductance in C4 plants and, when combined with well-established carbon isotope techniques, may provide additional information on mesophyll conductance in C3 plants.
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Affiliation(s)
- Margaret M Barbour
- Faculty of Agriculture and Environment, The University of Sydney, Private Bag 4011, Narellan, NSW, 2567, Australia
| | - John R Evans
- Research School of Biology, The Australian National University, Acton, ACT, 0200, Australia
| | - Kevin A Simonin
- Department of Biology, San Francisco State University, San Francisco, CA, 94132, USA
| | - Susanne von Caemmerer
- Research School of Biology, The Australian National University, Acton, ACT, 0200, Australia
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50
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Evans JR, Farquhar GD. Modeling Canopy Photosynthesis from the Biochemistry of the C 3 Chloroplast. Modeling Crop Photosynthesis-from Biochemistry to Canopy 2015. [DOI: 10.2135/cssaspecpub19.c1] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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