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Graus D, Li K, Rathje JM, Ding M, Krischke M, Müller MJ, Cuin TA, Al-Rasheid KAS, Scherzer S, Marten I, Konrad KR, Hedrich R. Tobacco leaf tissue rapidly detoxifies direct salt loads without activation of calcium and SOS signaling. THE NEW PHYTOLOGIST 2023; 237:217-231. [PMID: 36128659 DOI: 10.1111/nph.18501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/11/2022] [Accepted: 09/11/2022] [Indexed: 06/15/2023]
Abstract
Salt stress is a major abiotic stress, responsible for declining agricultural productivity. Roots are regarded as hubs for salt detoxification, however, leaf salt concentrations may exceed those of roots. How mature leaves manage acute sodium chloride (NaCl) stress is mostly unknown. To analyze the mechanisms for NaCl redistribution in leaves, salt was infiltrated into intact tobacco leaves. It initiated pronounced osmotically-driven leaf movements. Leaf downward movement caused by hydro-passive turgor loss reached a maximum within 2 h. Salt-driven cellular water release was accompanied by a transient change in membrane depolarization but not an increase in cytosolic calcium ion (Ca2+ ) level. Nonetheless, only half an hour later, the leaves had completely regained turgor. This recovery phase was characterized by an increase in mesophyll cell plasma membrane hydrogen ion (H+ ) pumping, a salt uptake-dependent cytosolic alkalization, and a return of the apoplast osmolality to pre-stress levels. Although, transcript numbers of abscisic acid- and Salt Overly Sensitive pathway elements remained unchanged, salt adaptation depended on the vacuolar H+ /Na+ -exchanger NHX1. Altogether, tobacco leaves can detoxify sodium ions (Na+ ) rapidly even under massive salt loads, based on pre-established posttranslational settings and NHX1 cation/H+ antiport activity. Unlike roots, signaling and processing of salt stress in tobacco leaves does not depend on Ca2+ signaling.
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Affiliation(s)
- Dorothea Graus
- Institute for Molecular Plant Physiology and Biophysics, University of Wuerzburg, Julius von-Sachs Platz 2, D-97082, Würzburg, Germany
| | - Kunkun Li
- Institute for Molecular Plant Physiology and Biophysics, University of Wuerzburg, Julius von-Sachs Platz 2, D-97082, Würzburg, Germany
| | - Jan M Rathje
- Institute for Molecular Plant Physiology and Biophysics, University of Wuerzburg, Julius von-Sachs Platz 2, D-97082, Würzburg, Germany
| | - Meiqi Ding
- Institute for Molecular Plant Physiology and Biophysics, University of Wuerzburg, Julius von-Sachs Platz 2, D-97082, Würzburg, Germany
| | - Markus Krischke
- Institute for Pharmaceutical Biology, University of Wuerzburg, Julius von-Sachs Platz 2, D-97082, Würzburg, Germany
| | - Martin J Müller
- Institute for Pharmaceutical Biology, University of Wuerzburg, Julius von-Sachs Platz 2, D-97082, Würzburg, Germany
| | - Tracey Ann Cuin
- Biological Sciences, School of Natural Sciences, University of Tasmania, Hobart, Tas., 7005, Australia
| | - Khaled A S Al-Rasheid
- Zoology Department, College of Science, King Saud University, 11451, Riyadh, Saudi Arabia
| | - Sönke Scherzer
- Institute for Molecular Plant Physiology and Biophysics, University of Wuerzburg, Julius von-Sachs Platz 2, D-97082, Würzburg, Germany
| | - Irene Marten
- Institute for Molecular Plant Physiology and Biophysics, University of Wuerzburg, Julius von-Sachs Platz 2, D-97082, Würzburg, Germany
| | - Kai R Konrad
- Institute for Molecular Plant Physiology and Biophysics, University of Wuerzburg, Julius von-Sachs Platz 2, D-97082, Würzburg, Germany
| | - Rainer Hedrich
- Institute for Molecular Plant Physiology and Biophysics, University of Wuerzburg, Julius von-Sachs Platz 2, D-97082, Würzburg, Germany
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Dufil G, Bernacka-Wojcik I, Armada-Moreira A, Stavrinidou E. Plant Bioelectronics and Biohybrids: The Growing Contribution of Organic Electronic and Carbon-Based Materials. Chem Rev 2021; 122:4847-4883. [PMID: 34928592 PMCID: PMC8874897 DOI: 10.1021/acs.chemrev.1c00525] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Life in our planet is highly dependent on plants as they are the primary source of food, regulators of the atmosphere, and providers of a variety of materials. In this work, we review the progress on bioelectronic devices for plants and biohybrid systems based on plants, therefore discussing advancements that view plants either from a biological or a technological perspective, respectively. We give an overview on wearable and implantable bioelectronic devices for monitoring and modulating plant physiology that can be used as tools in basic plant science or find application in agriculture. Furthermore, we discuss plant-wearable devices for monitoring a plant's microenvironment that will enable optimization of growth conditions. The review then covers plant biohybrid systems where plants are an integral part of devices or are converted to devices upon functionalization with smart materials, including self-organized electronics, plant nanobionics, and energy applications. The review focuses on advancements based on organic electronic and carbon-based materials and discusses opportunities, challenges, as well as future steps.
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Affiliation(s)
- Gwennaël Dufil
- Laboratory of Organic Electronics, Department of Science and Technology, Linköping University, SE-601 74 Norrköping, Sweden
| | - Iwona Bernacka-Wojcik
- Laboratory of Organic Electronics, Department of Science and Technology, Linköping University, SE-601 74 Norrköping, Sweden
| | - Adam Armada-Moreira
- Laboratory of Organic Electronics, Department of Science and Technology, Linköping University, SE-601 74 Norrköping, Sweden
| | - Eleni Stavrinidou
- Laboratory of Organic Electronics, Department of Science and Technology, Linköping University, SE-601 74 Norrköping, Sweden.,Wallenberg Wood Science Center, Department of Science and Technology, Linköping University, SE-60174 Norrköping, Sweden.,Umeå Plant Science Centre, Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, Campus Umeå, SE-901 83 Umeå, Sweden
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Tahjib-Ul-Arif M, Munemasa S, Nakamura T, Nakamura Y, Murata Y. Modulation of frequency and height of cytosolic calcium spikes by plasma membrane anion channels in guard cells. Biosci Biotechnol Biochem 2021; 85:2003-2010. [PMID: 34191003 DOI: 10.1093/bbb/zbab118] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2021] [Accepted: 06/21/2021] [Indexed: 11/13/2022]
Abstract
Cytosolic calcium ([Ca2+]cyt) elevation activates plasma membrane anion channels in guard cells, which is required for stomatal closure. However, involvement of the anion channels in the [Ca2+]cyt elevation remains unclear. We investigated the involvement using Arabidopsis thaliana anion channel mutants, slac1-4 slah3-3 and slac1-4 almt12-1. Extracellular calcium induced stomatal closure in the wild-type plants but not in the anion channel mutant plants whereas extracellular calcium induced [Ca2+]cyt elevation both in the wild-type guard cells and in the mutant guard cells. The peak height and the number of the [Ca2+]cyt spike were lower and larger in the slac1-4 slah3-3 than in the wild-type and the height and the number in the slac1-4 almt12-1 were much lower and much larger than in the wild-type. These results suggest that the anion channels are involved in the regulation of [Ca2+]cyt elevation in guard cells.
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Affiliation(s)
- Md Tahjib-Ul-Arif
- Graduate School of Environmental and Life Science, Okayama University, 700-8530, Okayama, Japan
| | - Shintaro Munemasa
- Graduate School of Environmental and Life Science, Okayama University, 700-8530, Okayama, Japan
| | - Toshiyuki Nakamura
- Graduate School of Environmental and Life Science, Okayama University, 700-8530, Okayama, Japan
| | - Yoshimasa Nakamura
- Graduate School of Environmental and Life Science, Okayama University, 700-8530, Okayama, Japan
| | - Yoshiyuki Murata
- Graduate School of Environmental and Life Science, Okayama University, 700-8530, Okayama, Japan
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Dindas J, Dreyer I, Huang S, Hedrich R, Roelfsema MRG. A voltage-dependent Ca 2+ homeostat operates in the plant vacuolar membrane. THE NEW PHYTOLOGIST 2021; 230:1449-1460. [PMID: 33577135 DOI: 10.1111/nph.17272] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/25/2020] [Accepted: 02/05/2021] [Indexed: 06/12/2023]
Abstract
Cytosolic calcium signals are evoked by a large variety of biotic and abiotic stimuli and play an important role in cellular and long distance signalling in plants. While the function of the plasma membrane in cytosolic Ca2+ signalling has been intensively studied, the role of the vacuolar membrane remains elusive. A newly developed vacuolar voltage clamp technique was used in combination with live-cell imaging, to study the role of the vacuolar membrane in Ca2+ and pH homeostasis of bulging root hair cells of Arabidopsis. Depolarisation of the vacuolar membrane caused a rapid increase in the Ca2+ concentration and alkalised the cytosol, while hyperpolarisation led to the opposite responses. The relationship between the vacuolar membrane potential, the cytosolic pH and Ca2+ concentration suggests that a vacuolar H+ /Ca2+ exchange mechanism plays a central role in cytosolic Ca2+ homeostasis. Mathematical modelling further suggests that the voltage-dependent vacuolar Ca2+ homeostat could contribute to calcium signalling when coupled to a recently discovered K+ channel-dependent module for electrical excitability of the vacuolar membrane.
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Affiliation(s)
- Julian Dindas
- Molecular Plant Physiology and Biophysics, Julius-von-Sachs Institute for Biosciences, Biocenter, Würzburg University, Würzburg, D-97082, Germany
- Institute of Plant and Microbial Biology and Zürich-Basel Plant Science Center, University of Zürich, Zollikerstrasse 107, Zürich, CH-8008, Switzerland
| | - Ingo Dreyer
- Center of Bioinformatics, Simulation and Modeling (CBSM), Faculty of Engineering, Universidad de Talca, 2 Norte 685, Talca, 3460000, Chile
| | - Shouguang Huang
- Molecular Plant Physiology and Biophysics, Julius-von-Sachs Institute for Biosciences, Biocenter, Würzburg University, Würzburg, D-97082, Germany
| | - Rainer Hedrich
- Molecular Plant Physiology and Biophysics, Julius-von-Sachs Institute for Biosciences, Biocenter, Würzburg University, Würzburg, D-97082, Germany
| | - M Rob G Roelfsema
- Molecular Plant Physiology and Biophysics, Julius-von-Sachs Institute for Biosciences, Biocenter, Würzburg University, Würzburg, D-97082, Germany
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Huang S, Waadt R, Nuhkat M, Kollist H, Hedrich R, Roelfsema MRG. Calcium signals in guard cells enhance the efficiency by which abscisic acid triggers stomatal closure. THE NEW PHYTOLOGIST 2019; 224:177-187. [PMID: 31179540 PMCID: PMC6771588 DOI: 10.1111/nph.15985] [Citation(s) in RCA: 48] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2019] [Accepted: 06/03/2019] [Indexed: 05/12/2023]
Abstract
During drought, abscisic acid (ABA) induces closure of stomata via a signaling pathway that involves the calcium (Ca2+ )-independent protein kinase OST1, as well as Ca2+ -dependent protein kinases. However, the interconnection between OST1 and Ca2+ signaling in ABA-induced stomatal closure has not been fully resolved. ABA-induced Ca2+ signals were monitored in intact Arabidopsis leaves, which express the ratiometric Ca2+ reporter R-GECO1-mTurquoise and the Ca2+ -dependent activation of S-type anion channels was recorded with intracellular double-barreled microelectrodes. ABA triggered Ca2+ signals that occurred during the initiation period, as well as in the acceleration phase of stomatal closure. However, a subset of stomata closed in the absence of Ca2+ signals. On average, stomata closed faster if Ca2+ signals were elicited during the ABA response. Loss of OST1 prevented ABA-induced stomatal closure and repressed Ca2+ signals, whereas elevation of the cytosolic Ca2+ concentration caused a rapid activation of SLAC1 and SLAH3 anion channels. Our data show that the majority of Ca2+ signals are evoked during the acceleration phase of stomatal closure, which is initiated by OST1. These Ca2+ signals are likely to activate Ca2+ -dependent protein kinases, which enhance the activity of S-type anion channels and boost stomatal closure.
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Affiliation(s)
- Shouguang Huang
- Molecular Plant Physiology and BiophysicsJulius‐von‐Sachs Institute for BiosciencesBiocenter, Würzburg UniversityJulius‐von‐Sachs‐Platz 2D‐97082 WürzburgGermany
| | - Rainer Waadt
- Centre for Organismal StudiesPlant Developmental BiologyRuprecht‐Karls‐Universität HeidelbergIm Neuenheimer Feld 230D‐69120 HeidelbergGermany
| | - Maris Nuhkat
- Institute of TechnologyUniversity of TartuNooruse 1Tartu50411Estonia
| | - Hannes Kollist
- Institute of TechnologyUniversity of TartuNooruse 1Tartu50411Estonia
| | - Rainer Hedrich
- Molecular Plant Physiology and BiophysicsJulius‐von‐Sachs Institute for BiosciencesBiocenter, Würzburg UniversityJulius‐von‐Sachs‐Platz 2D‐97082 WürzburgGermany
| | - M. Rob G. Roelfsema
- Molecular Plant Physiology and BiophysicsJulius‐von‐Sachs Institute for BiosciencesBiocenter, Würzburg UniversityJulius‐von‐Sachs‐Platz 2D‐97082 WürzburgGermany
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Graus D, Konrad KR, Bemm F, Patir Nebioglu MG, Lorey C, Duscha K, Güthoff T, Herrmann J, Ferjani A, Cuin TA, Roelfsema MRG, Schumacher K, Neuhaus HE, Marten I, Hedrich R. High V-PPase activity is beneficial under high salt loads, but detrimental without salinity. THE NEW PHYTOLOGIST 2018; 219:1421-1432. [PMID: 29938800 PMCID: PMC6099232 DOI: 10.1111/nph.15280] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/23/2018] [Accepted: 05/15/2018] [Indexed: 05/03/2023]
Abstract
The membrane-bound proton-pumping pyrophosphatase (V-PPase), together with the V-type H+ -ATPase, generates the proton motive force that drives vacuolar membrane solute transport. Transgenic plants constitutively overexpressing V-PPases were shown to have improved salinity tolerance, but the relative impact of increasing PPi hydrolysis and proton-pumping functions has yet to be dissected. For a better understanding of the molecular processes underlying V-PPase-dependent salt tolerance, we transiently overexpressed the pyrophosphate-driven proton pump (NbVHP) in Nicotiana benthamiana leaves and studied its functional properties in relation to salt treatment by primarily using patch-clamp, impalement electrodes and pH imaging. NbVHP overexpression led to higher vacuolar proton currents and vacuolar acidification. After 3 d in salt-untreated conditions, V-PPase-overexpressing leaves showed a drop in photosynthetic capacity, plasma membrane depolarization and eventual leaf necrosis. Salt, however, rescued NbVHP-hyperactive cells from cell death. Furthermore, a salt-induced rise in V-PPase but not of V-ATPase pump currents was detected in nontransformed plants. The results indicate that under normal growth conditions, plants need to regulate the V-PPase pump activity to avoid hyperactivity and its negative feedback on cell viability. Nonetheless, V-PPase proton pump function becomes increasingly important under salt stress for generating the pH gradient necessary for vacuolar proton-coupled Na+ sequestration.
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Affiliation(s)
- Dorothea Graus
- Institute for Molecular Plant Physiology and BiophysicsUniversity of WürzburgJulius von‐Sachs Platz 2WürzburgD‐97082Germany
| | - Kai R. Konrad
- Institute for Molecular Plant Physiology and BiophysicsUniversity of WürzburgJulius von‐Sachs Platz 2WürzburgD‐97082Germany
| | - Felix Bemm
- Institute of BioinformaticsCenter for Computational and Theoretical, BiologyUniversity of WürzburgAm HublandWürzburgD‐97218Germany
| | - Meliha Görkem Patir Nebioglu
- Centre for Organismal StudiesDevelopmental Biology of PlantsRuprecht‐Karls‐University of HeidelbergIm Neuenheimer Feld 230Heidelberg69120Germany
| | - Christian Lorey
- Institute for Molecular Plant Physiology and BiophysicsUniversity of WürzburgJulius von‐Sachs Platz 2WürzburgD‐97082Germany
| | - Kerstin Duscha
- Plant PhysiologyUniversity KaiserslauternPostfach 3049KaiserslauternD‐67653Germany
| | - Tilman Güthoff
- Institute for Molecular Plant Physiology and BiophysicsUniversity of WürzburgJulius von‐Sachs Platz 2WürzburgD‐97082Germany
| | - Johannes Herrmann
- Institute for Molecular Plant Physiology and BiophysicsUniversity of WürzburgJulius von‐Sachs Platz 2WürzburgD‐97082Germany
| | - Ali Ferjani
- Department of BiologyTokyo Gakugei UniversityNukui Kitamachi 4‐1‐1Koganei‐shiTokyo184‐8501Japan
| | - Tracey Ann Cuin
- Tasmanian Institute of AgricultureUniversity of TasmaniaHobartTAS7001Australia
| | - M. Rob G. Roelfsema
- Institute for Molecular Plant Physiology and BiophysicsUniversity of WürzburgJulius von‐Sachs Platz 2WürzburgD‐97082Germany
| | - Karin Schumacher
- Centre for Organismal StudiesDevelopmental Biology of PlantsRuprecht‐Karls‐University of HeidelbergIm Neuenheimer Feld 230Heidelberg69120Germany
| | - H. Ekkehard Neuhaus
- Plant PhysiologyUniversity KaiserslauternPostfach 3049KaiserslauternD‐67653Germany
| | - Irene Marten
- Institute for Molecular Plant Physiology and BiophysicsUniversity of WürzburgJulius von‐Sachs Platz 2WürzburgD‐97082Germany
| | - Rainer Hedrich
- Institute for Molecular Plant Physiology and BiophysicsUniversity of WürzburgJulius von‐Sachs Platz 2WürzburgD‐97082Germany
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Voss LJ, McAdam SAM, Knoblauch M, Rathje JM, Brodribb T, Hedrich R, Roelfsema MRG. Guard cells in fern stomata are connected by plasmodesmata, but control cytosolic Ca 2+ levels autonomously. THE NEW PHYTOLOGIST 2018; 219:206-215. [PMID: 29655174 DOI: 10.1111/nph.15153] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2017] [Accepted: 03/06/2018] [Indexed: 05/10/2023]
Abstract
Recent studies have revealed that some responses of fern stomata to environmental signals differ from those of their relatives in seed plants. However, it is unknown whether the biophysical properties of guard cells differ fundamentally between species of both clades. Intracellular micro-electrodes and the fluorescent Ca2+ reporter FURA2 were used to study voltage-dependent cation channels and Ca2+ signals in guard cells of the ferns Polypodium vulgare and Asplenium scolopendrium. Voltage clamp experiments with fern guard cells revealed similar properties of voltage-dependent K+ channels as found in seed plants. However, fluorescent dyes moved within the fern stomata, from one guard cell to the other, which does not occur in most seed plants. Despite the presence of plasmodesmata, which interconnect fern guard cells, Ca2+ signals could be elicited in each of the cells individually. Based on the common properties of voltage-dependent channels in ferns and seed plants, it is likely that these key transport proteins are conserved in vascular plants. However, the symplastic connections between fern guard cells in mature stomata indicate that the biophysical mechanisms that control stomatal movements differ between ferns and seed plants.
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Affiliation(s)
- Lena J Voss
- Molecular Plant Physiology and Biophysics, Julius-von-Sachs Institute for Biosciences, Biocenter, Würzburg University, Julius-von-Sachs-Platz 2, D-97082, Würzburg, Germany
| | - Scott A M McAdam
- School of Biological Science, University of Tasmania, Hobart, TAS, 7001, Australia
- Botany and Plant Pathology, Purdue University, 915 West State Street, West Lafayette, IN, 47907, USA
| | - Michael Knoblauch
- School of Biological Sciences, Washington State University, PO Box 644236, Pullman, WA, 99164-4236, USA
| | - Jan M Rathje
- Molecular Plant Physiology and Biophysics, Julius-von-Sachs Institute for Biosciences, Biocenter, Würzburg University, Julius-von-Sachs-Platz 2, D-97082, Würzburg, Germany
| | - Tim Brodribb
- School of Biological Science, University of Tasmania, Hobart, TAS, 7001, Australia
| | - Rainer Hedrich
- Molecular Plant Physiology and Biophysics, Julius-von-Sachs Institute for Biosciences, Biocenter, Würzburg University, Julius-von-Sachs-Platz 2, D-97082, Würzburg, Germany
| | - M Rob G Roelfsema
- Molecular Plant Physiology and Biophysics, Julius-von-Sachs Institute for Biosciences, Biocenter, Würzburg University, Julius-von-Sachs-Platz 2, D-97082, Würzburg, Germany
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Konrad KR, Maierhofer T, Hedrich R. Spatio-temporal Aspects of Ca2+ Signalling: Lessons from Guard Cells and Pollen Tubes. JOURNAL OF EXPERIMENTAL BOTANY 2018; 69:4986225. [PMID: 29701811 DOI: 10.1093/jxb/ery154] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2018] [Indexed: 05/06/2023]
Abstract
Changes in cytosolic Ca2+ concentration ([Ca2+]cyt) serve to transmit information in eukaryotic cells. The involvement of this second messenger in plant cell growth as well as osmotic- and water relations is well established. After almost 40 years of intense research on the coding and decoding of plant Ca2+ signals, numerous proteins involved in Ca2+ action have been identified. However, we are still far from understanding the complexity of Ca2+ networks. New in vivo Ca2+ imaging techniques combined with molecular genetics allow visualisation of spatio-temporal aspects of Ca2+ signalling. In parallel, cell biology together with protein biochemistry and electrophysiology are able to dissect information processing by this second messenger in space and time. Here we focus on the time-resolved changes in cellular events upon Ca2+ signals, concentrating on the two best-studied cell types, pollen tubes and guard cells. We put their signalling networks side by side, compare them with those of other cell types and discuss rapid signalling in the context of Ca2+ transients and oscillations to regulate ion homeostasis.
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Affiliation(s)
- K R Konrad
- University of Wuerzburg, Julius-Von-Sachs Institute for Biosciences, Department of Botany I, Wuerzburg, Germany
| | - T Maierhofer
- University of Wuerzburg, Julius-Von-Sachs Institute for Biosciences, Department of Botany I, Wuerzburg, Germany
| | - R Hedrich
- University of Wuerzburg, Julius-Von-Sachs Institute for Biosciences, Department of Botany I, Wuerzburg, Germany
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