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Morina F, Mijovilovich A, Mishra A, Brückner D, Vujić B, Bokhari SNH, Špak J, Falkenberg G, Küpper H. Cadmium and Zn hyperaccumulation provide efficient constitutive defense against Turnip yellow mosaic virus infection in Noccaea caerulescens. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2023; 336:111864. [PMID: 37689279 DOI: 10.1016/j.plantsci.2023.111864] [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: 04/28/2023] [Revised: 08/25/2023] [Accepted: 09/06/2023] [Indexed: 09/11/2023]
Abstract
To understand the role of Zn and Cd in anti-viral defence, Zn/Cd hyperaccumulator Noccaea caerulescens plants grown with deficient (0.3 µM), replete (10 µM) and excess (100 µM) Zn2+ and Cd (10 µM Zn2+ + 1 µM Cd2+) were infected with Turnip yellow mosaic virus (TYMV). Gas exchange and chlorophyll fluorescence kinetics analyses demonstrated direct TYMV effects on photosynthetic light reactions but N. caerulescens was more resistant against TYMV than the previously studied non-hyperaccumulator N. ochroleucum. Virus abundance and photosynthesis inhibition were the lowest in the high Zn and Cd treatments. RNAseq analysis of 10 µM Zn2+ plants revealed TYMV-induced upregulation of Ca transporters, chloroplastic ZTP29 and defence genes, but none of those that are known to be strongly involved in hyperaccumulation. Synchrotron µ-XRF tomography, however, showed that Zn hyperaccumulation remained strongest in vacuoles of epidermal storage cells regardless of infection. This was in contrast to N. ochroleucum, where apoplastic Zn drastically increased in response to TYMV. These results suggest that the antiviral response of N. caerulescens is less induced by the onset of this biotic stress, but it is rather a permanent resistant state of the plant. Real-time qPCR revealed upregulation of ferritin in Zn10 infected plants, suggesting Fe deprivation as a virus defence strategy under suboptimal Zn supply.
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Affiliation(s)
- Filis Morina
- Czech Academy of Sciences, Biology Centre, Institute of Plant Molecular Biology, Laboratory of Plant Biophysics & Biochemistry, Branišovská 31/1160, 370 05 České Budějovice, Czech Republic.
| | - Ana Mijovilovich
- Czech Academy of Sciences, Biology Centre, Institute of Plant Molecular Biology, Laboratory of Plant Biophysics & Biochemistry, Branišovská 31/1160, 370 05 České Budějovice, Czech Republic.
| | - Archana Mishra
- Czech Academy of Sciences, Biology Centre, Institute of Plant Molecular Biology, Laboratory of Plant Biophysics & Biochemistry, Branišovská 31/1160, 370 05 České Budějovice, Czech Republic.
| | - Dennis Brückner
- Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607 Hamburg, Germany; University of Hamburg, Department of Physics, Jungiusstr. 9, 20355 Hamburg, Germany; Ruhr-Universität Bochum, Faculty of Chemistry and Biochemistry, Universitätsstr. 150, 44801 Bochum, Germany.
| | - Bojan Vujić
- Czech Academy of Sciences, Biology Centre, Institute of Plant Molecular Biology, Laboratory of Plant Biophysics & Biochemistry, Branišovská 31/1160, 370 05 České Budějovice, Czech Republic.
| | - Syed Nadeem Hussain Bokhari
- Czech Academy of Sciences, Biology Centre, Institute of Plant Molecular Biology, Laboratory of Plant Biophysics & Biochemistry, Branišovská 31/1160, 370 05 České Budějovice, Czech Republic.
| | - Josef Špak
- Czech Academy of Sciences, Biology Centre, Institute of Plant Molecular Biology, Laboratory of Plant Biophysics & Biochemistry, Branišovská 31/1160, 370 05 České Budějovice, Czech Republic.
| | - Gerald Falkenberg
- Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607 Hamburg, Germany.
| | - Hendrik Küpper
- Czech Academy of Sciences, Biology Centre, Institute of Plant Molecular Biology, Laboratory of Plant Biophysics & Biochemistry, Branišovská 31/1160, 370 05 České Budějovice, Czech Republic; University of South Bohemia, Faculty of Science, Department of Experimental Plant Biology, Branišovská 31/1160, 370 05 České Budějovice, Czech Republic.
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2
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Manara A, Fasani E, Furini A, DalCorso G. Evolution of the metal hyperaccumulation and hypertolerance traits. PLANT, CELL & ENVIRONMENT 2020; 43:2969-2986. [PMID: 32520430 DOI: 10.1111/pce.13821] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/19/2020] [Revised: 05/20/2020] [Accepted: 06/05/2020] [Indexed: 05/21/2023]
Abstract
To succeed in life, living organisms have to adapt to the environmental issues to which they are subjected. Some plants, defined as hyperaccumulators, have adapted to metalliferous environments, acquiring the ability to tolerate and accommodate high amounts of toxic metal into their shoot, without showing symptoms of toxicity. The determinants for these traits and their mode of action have long been the subject of research, whose attention lately moved to the evolution of the hypertolerance and hyperaccumulation traits. Genetic evidence indicates that the evolution of both traits includes significant evolutionary events that result in species-wide tolerant and accumulating backgrounds. Different edaphic environments are responsible for subsequent refinement, by local adaptive processes, leading to specific strategies and various degrees of hypertolerance and hyperaccumulation, which characterize metallicolous from non-metallicolous ecotypes belonging to the same genetic unit. In this review, we overview the most updated concepts regarding the evolution of hyperaccumulation and hypertolerance, highlighting also the ecological context concerning the plant populations displaying this fascinating phenomenon.
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Affiliation(s)
- Anna Manara
- Department of Biotechnology, University of Verona, Verona, Italy
| | - Elisa Fasani
- Department of Biotechnology, University of Verona, Verona, Italy
| | - Antonella Furini
- Department of Biotechnology, University of Verona, Verona, Italy
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Lin T, Chen J, Zhou S, Yu W, Chen G, Chen L, Wang X, Shi H, Han S, Zhang F. Testing the elemental defense hypothesis with a woody plant species: Cadmium accumulation protects Populus yunnanensis from leaf herbivory and pathogen infection. CHEMOSPHERE 2020; 247:125851. [PMID: 31931315 DOI: 10.1016/j.chemosphere.2020.125851] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2019] [Revised: 01/02/2020] [Accepted: 01/04/2020] [Indexed: 06/10/2023]
Abstract
Elemental defense hypothesis states that metals accumulated in plant tissues may serve as defense against herbivores and pathogens. However, evidences collected so far are inconsistent and studies using woody plants as model species are still lacking. In this study we used a local woody plant species, Populus yunnanensis, to investigate whether cadmium (Cd) accumulation in leaves can protect plants from leaf herbivory and pathogen infection. Plants grown with or without Cd supplementation in the soil were subjected to herbivory by a specialist (Botyodes diniasalis) and a generalist (Spodoptera exigua), or to pathogen infection by a leaf pathogenic fungus (Pestalotiopsis microspora). Two additional tests with artificial media amended with a series of Cd concentrations were conducted for S. exigua and P. microspora to investigate the toxicity of Cd independently of other organic defenses present in P. yunnanensis leaves. The results showed that both herbivores strongly preferred control leaves over leaves containing high Cd. Feeding on leaves from Cd-treated plants significantly reduced the growth and survivals of both herbivores. Furthermore, plants grown on Cd-amended soil were more resistant to fungal infection. Growth of S. exigua and P. microspora on artificial media decreased with increasing Cd concentrations. In conclusion, we found that Cd accumulated in P. yunnanensis leaves could effectively reduce leaf herbivory and pathogen infection, which fully supported the Elemental defense hypothesis.
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Affiliation(s)
- Tiantian Lin
- Key Laboratory of National Forestry & Grassland Administration on Forest Resources Conservation and Ecological Safety in the Upper Reaches of the Yangtze River, College of Forestry, Sichuan Agricultural University, Chengdu, Sichuan, 611130, China.
| | - Jiaping Chen
- Key Laboratory of National Forestry & Grassland Administration on Forest Resources Conservation and Ecological Safety in the Upper Reaches of the Yangtze River, College of Forestry, Sichuan Agricultural University, Chengdu, Sichuan, 611130, China
| | - Shanshan Zhou
- Key Laboratory of National Forestry & Grassland Administration on Forest Resources Conservation and Ecological Safety in the Upper Reaches of the Yangtze River, College of Forestry, Sichuan Agricultural University, Chengdu, Sichuan, 611130, China
| | - Wenhui Yu
- Key Laboratory of National Forestry & Grassland Administration on Forest Resources Conservation and Ecological Safety in the Upper Reaches of the Yangtze River, College of Forestry, Sichuan Agricultural University, Chengdu, Sichuan, 611130, China
| | - Gang Chen
- Key Laboratory of National Forestry & Grassland Administration on Forest Resources Conservation and Ecological Safety in the Upper Reaches of the Yangtze River, College of Forestry, Sichuan Agricultural University, Chengdu, Sichuan, 611130, China
| | - Lianghua Chen
- Key Laboratory of National Forestry & Grassland Administration on Forest Resources Conservation and Ecological Safety in the Upper Reaches of the Yangtze River, College of Forestry, Sichuan Agricultural University, Chengdu, Sichuan, 611130, China
| | - Xuegui Wang
- College of Agriculture, Sichuan Agricultural University, 611130, Chengdu, China
| | - Hongzhou Shi
- Liangshan State Institute of Forestry Science, 615000, Xichang, China
| | - Shan Han
- Key Laboratory of National Forestry & Grassland Administration on Forest Resources Conservation and Ecological Safety in the Upper Reaches of the Yangtze River, College of Forestry, Sichuan Agricultural University, Chengdu, Sichuan, 611130, China
| | - Fan Zhang
- College of Landscape Architecture, Sichuan Agricultural University, 611130, Chengdu, China
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Morina F, Mishra A, Mijovilovich A, Matoušková Š, Brückner D, Špak J, Küpper H. Interaction Between Zn Deficiency, Toxicity and Turnip Yellow Mosaic Virus Infection in Noccaea ochroleucum. FRONTIERS IN PLANT SCIENCE 2020; 11:739. [PMID: 32582260 PMCID: PMC7290001 DOI: 10.3389/fpls.2020.00739] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2019] [Accepted: 05/08/2020] [Indexed: 05/08/2023]
Abstract
Zinc is essential for the functioning of numerous proteins in plants. To investigate how Zn homeostasis interacts with virus infection, Zn-tolerant Noccaea ochroleucum plants exposed to deficient (Zn'0'), optimal (Zn10), and excess Zn (Zn100) concentrations, as well as Cd amendment, were infected with Turnip yellow mosaic virus (TYMV). Imaging analysis of fluorescence kinetics from the μs (OJIP) to the minutes (Kautsky effect, quenching analysis) time domain revealed strong patchiness of systemic virus-induced photosystem II (PSII) inhibition. That was more pronounced in Zn-deficient plants, while Zn excess acted synergistically with TYMV, in both cases resulting in reduced PSII reaction centers. Infected Cd-treated plants, already severely stressed, showed inhibited non-photochemical quenching and PSII activity. Quantitative in situ hybridization at the cellular level showed increased gene expression of ZNT5 and downregulation of HMA4 in infected Zn-deficient leaves. In Zn10 and Zn100 infected leaves, vacuolar sequestration of Zn increased by activation of HMA3 (mesophyll) and MTP1 (epidermis). This correlated with Zn accumulation in the mesophyll and formation of biomineralization dots in the cell wall (Zn100) visible by micro X-ray fluorescence tomography. The study reveals the importance of adequate Zn supply and distribution in the maintenance of photosynthesis under TYMV infection, achieved by tissue-targeted activation of metal transporter gene expression.
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Affiliation(s)
- Filis Morina
- Department of Plant Biophysics and Biochemistry, Biology Centre, Institute of Plant Molecular Biology, Czech Academy of Sciences, České Budějovice, Czechia
| | - Archana Mishra
- Department of Plant Biophysics and Biochemistry, Biology Centre, Institute of Plant Molecular Biology, Czech Academy of Sciences, České Budějovice, Czechia
| | - Ana Mijovilovich
- Department of Plant Biophysics and Biochemistry, Biology Centre, Institute of Plant Molecular Biology, Czech Academy of Sciences, České Budějovice, Czechia
| | - Šárka Matoušková
- Department of Geological Processes, Czech Academy of Sciences, Institute of Geology, Rozvojová, Czechia
| | - Dennis Brückner
- Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany
- Department of Physics, University of Hamburg, Hamburg, Germany
- Faculty of Chemistry and Biochemistry, Ruhr-University Bochum, Bochum, Germany
| | - Josef Špak
- Department of Plant Virology, Biology Centre, Institute of Plant Molecular Biology, Czech Academy of Sciences, České Budějovice, Czechia
| | - Hendrik Küpper
- Department of Plant Biophysics and Biochemistry, Biology Centre, Institute of Plant Molecular Biology, Czech Academy of Sciences, České Budějovice, Czechia
- Department of Experimental Plant Biology, University of South Bohemia, České Budějovice, Czechia
- *Correspondence: Hendrik Küpper,
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5
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van der Pas L, Ingle RA. Towards an Understanding of the Molecular Basis of Nickel Hyperaccumulation in Plants. PLANTS (BASEL, SWITZERLAND) 2019; 8:E11. [PMID: 30621231 PMCID: PMC6359332 DOI: 10.3390/plants8010011] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/06/2018] [Revised: 12/28/2018] [Accepted: 12/31/2018] [Indexed: 12/19/2022]
Abstract
Metal hyperaccumulation is a rare and fascinating phenomenon, whereby plants actively accumulate high concentrations of metal ions in their above-ground tissues. Enhanced uptake and root-to-shoot translocation of specific metal ions coupled with an increased capacity for detoxification and sequestration of these ions are thought to constitute the physiological basis of the hyperaccumulation phenotype. Nickel hyperaccumulators were the first to be discovered and are the most numerous, accounting for some seventy-five percent of all known hyperaccumulators. However, our understanding of the molecular basis of the physiological processes underpinning Ni hyperaccumulation has lagged behind that of Zn and Cd hyperaccumulation, in large part due to a lack of genomic resources for Ni hyperaccumulators. The advent of RNA-Seq technology, which allows both transcriptome assembly and profiling of global gene expression without the need for a reference genome, has offered a new route for the analysis of Ni hyperaccumulators, and several such studies have recently been reported. Here we review the current state of our understanding of the molecular basis of Ni hyperaccumulation in plants, with an emphasis on insights gained from recent RNA-Seq experiments, highlight commonalities and differences between Ni hyperaccumulators, and suggest potential future avenues of research in this field.
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Affiliation(s)
- Llewelyn van der Pas
- Department of Molecular and Cell Biology, University of Cape Town, Rondebosch 7701, South Africa.
| | - Robert A Ingle
- Department of Molecular and Cell Biology, University of Cape Town, Rondebosch 7701, South Africa.
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Polacco JC, Mazzafera P, Tezotto T. Opinion: nickel and urease in plants: still many knowledge gaps. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2013; 199-200:79-90. [PMID: 23265321 DOI: 10.1016/j.plantsci.2012.10.010] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2012] [Revised: 10/19/2012] [Accepted: 10/20/2012] [Indexed: 05/22/2023]
Abstract
We propose experimental strategies to expand our understanding of the role of Ni in plants, beyond the Ni-metallocenter of urease, still the only identified Ni-containing plant enzyme. While Ni has been considered an essential mineral for plants there is a clear lack of knowledge of its involvement in metabolic steps except the urease-catalyzed conversion of urea to ammonia and bicarbonate. We argue that urease (and hence, Ni) plays an important role in optimal N-use efficiency under various N regimes by recycling urea-N, which is generated endogenously exclusively from arginase action on arginine. We further suggest that urease and arginase may connect different metabolic compartments under stress situations, and therefore may be involved in stress tolerance. To determine possible non-urease roles of Ni we call for experimental manipulation of both Ni and N availability in urease-negative mutants. Plant ureases have been shown to have defense roles, distinct from their ureolytic activity, and we call for investigation of whether Ni helps maintain a urease conformation or stability for these non-ureolytic defense roles. The beneficial effects of Ni at upper concentration limits have not been fully examined. We posit a "Ni strategy" of plants whose growth/performance is stimulated by unusual amounts of soil Ni, for defense and/or for maximal N-use efficiency. While we know little about Ni and urease roles in N metabolism and defense, virtually nothing is known about Ni roles in plant-microbial 'consortia.' And, much of what we know of Ni and urease is limited to only a few plants, e.g. soybean, potato and Arabidopsis, and we suggest studies vigorously extended to other plants.
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Affiliation(s)
- Joe C Polacco
- University of Missouri, Department of Biochemistry, Interdisciplinary Plant Group, Columbia, MO 65211, United States.
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Abstract
The study evaluated the total and available heavy metal (Cd, Cu, Cr, Pb, Ni, and Zn) contents of two red soils in Samar, Philippines, one developed from slate near a mining site (Bagacay soil) and the other from serpentinite (Salcedo soil), a well-known source of heavy metals. Soil samples were collected from every horizon in each profile and samples were digested using aqua regia and NH4NO3 to determine total and available heavy metals content, respectively. Results revealed that Salcedo soil had high contents of total Cr (average: 1353 mg kg-1), total Ni (average: 610 mg kg-1), and available Cr (average: 0.19 mg kg-1) that exceeded the maximum allowable contents in agricultural soils but it had low amounts of the available form of the heavy metals. Bagacay soil showed very low contents of both total and available heavy metals due to their low amounts in the parent rock. The red Bagacay soil showed no effect of the nearby mining activity.
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Affiliation(s)
- Ian Navarrete
- Laboratory of Environmental Soil Science, Obihiro University of Agriculture and Veterinary Medicine, Inada-cho 080-8555, Japan
| | - Victor Asio
- Department of Agronomy and Soil Science, Visayas State University, Baybay City, Leyte 6521-A Philippines
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Susaya JP, Kim KH, Asio VB, Chen ZS, Navarrete I. Quantifying nickel in soils and plants in an ultramafic area in Philippines. ENVIRONMENTAL MONITORING AND ASSESSMENT 2010; 167:505-514. [PMID: 19603280 DOI: 10.1007/s10661-009-1067-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2009] [Accepted: 06/30/2009] [Indexed: 05/28/2023]
Abstract
In this study, concentrations of nickel (Ni) were quantified in the soils and plants in the agricultural areas of Salcedo watershed in Eastern Samar Island, Philippines. The quantity of total Ni in soils (TS-Ni) was significantly high with a mean of 1,409 mg kg(-1), while the soil available Ni (SA-Ni) was low with a mean of 8.66 mg kg(-1). As the levels of TS-Ni in the Salcedo watershed greatly exceeded the maximum allowable concentrations for agricultural soils, the site is not suitable for agricultural purposes. Despite significant TS-Ni levels, SA-Ni levels were very low due to tight binding between Ni and soil components. Consequently, all plants investigated did not meet the criterion for a Ni hyperaccumulator plant with low Ni contents (mean TP-Ni of 14.7 mg kg(-1)). Comparison of Ni levels between food plants and its recommended daily intake (RDI) suggests that consumption of food-plants grown in the study area is unlikely to pose health risks. However, caution must be taken against combined consumption of food plants with high Ni levels or their prolonged consumption, as it can induce accumulation of Ni above RDI.
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Affiliation(s)
- Janice P Susaya
- Department of Earth and Environmental Sciences, Sejong University, Seoul, Korea
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Bomblies K. Doomed lovers: mechanisms of isolation and incompatibility in plants. ANNUAL REVIEW OF PLANT BIOLOGY 2010; 61:109-124. [PMID: 20192733 DOI: 10.1146/annurev-arplant-042809-112146] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Adaptation to local conditions likely plays an important role in plant diversity and speciation. A fuller understanding of the role of adaptation in speciation requires connecting particular molecular events with selection occurring at individual, population, or community levels. Here I discuss five areas in which we understand the molecular basis of adaptation and isolation sufficiently to begin examining patterns. These examples highlight the importance of understanding both biotic and abiotic factors and the potential overlap between them, and demonstrate that understanding molecular mechanisms aids in interpreting pleiotropy and constraint. For example, mutations affecting anthocyanin production can affect both pollinator visitation and parasite attack, while edaphic adaptation can alter parasite susceptibility and reproductive timing. Adaptation is also implicated in postzygotic incompatibility: Potentially adaptive cytoplasmic divergence can lead to sterility or inviability; hybrid sterility genes may have pleiotropic effects in biotic or abiotic stress; and the plant immune system is implicated in hybrid failure.
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Affiliation(s)
- Kirsten Bomblies
- Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, Massachusetts 02138, USA.
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Liu J, Richerson K, Nelson RS. Growth Conditions for Plant Virus–Host Studies. ACTA ACUST UNITED AC 2009; Chapter 16:Unit16A.1. [DOI: 10.1002/9780471729259.mc16a01s14] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Jian‐Zhong Liu
- Plant Biology Division, Samuel Roberts Noble Foundation Ardmore Oklahoma
- University of California‐Berkeley Albany California
| | - Kristy Richerson
- Plant Biology Division, Samuel Roberts Noble Foundation Ardmore Oklahoma
- Andreae Team, Inc Ardmore Oklahoma
| | - Richard S. Nelson
- Plant Biology Division, Samuel Roberts Noble Foundation Ardmore Oklahoma
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11
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Dmitriev A, Shevchenko O, Polischuk V, Guscha N. Effects of Low Dose Chronic Radiation and Heavy Metals on Plants and Their Fungal and Virus Infections. DATA SCIENCE JOURNAL 2009. [DOI: 10.2481/dsj.br-07] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Wall MA, Boyd RS. MELANOTRICHUS BOYDI (HEMIPTERA: MIRIDAE) IS A SPECIALIST ON THE NICKEL HYPERACCUMULATOR STREPTANTHUS POLYGALOIDES (BRASSICACEAE). SOUTHWEST NAT 2006. [DOI: 10.1894/0038-4909(2006)51[481:mbhmia]2.0.co;2] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Freeman JL, Quinn CF, Marcus MA, Fakra S, Pilon-Smits EAH. Selenium-Tolerant Diamondback Moth Disarms Hyperaccumulator Plant Defense. Curr Biol 2006; 16:2181-92. [PMID: 17113382 DOI: 10.1016/j.cub.2006.09.015] [Citation(s) in RCA: 78] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2006] [Revised: 08/31/2006] [Accepted: 09/02/2006] [Indexed: 10/23/2022]
Abstract
BACKGROUND Some plants hyperaccumulate the toxic element selenium (Se) to extreme levels, up to 1% of dry weight. The function of this intriguing phenomenon is obscure. RESULTS Here, we show that the Se in the hyperaccumulator prince's plume (Stanleya pinnata) protects it from caterpillar herbivory because of deterrence and toxicity. In its natural habitat, however, a newly discovered variety of the invasive diamondback moth (Plutella xylostella) has disarmed this elemental defense. It thrives on plants containing highly toxic Se levels and shows no oviposition or feeding deterrence, in contrast to related varieties. Interestingly, a Se-tolerant wasp (Diadegma insulare) was found to parasitize the tolerant moth. The insect's Se tolerance mechanism was revealed by X-ray absorption spectroscopy and liquid chromatography-mass spectroscopy, which showed that the Se-tolerant moth and its parasite both accumulate methylselenocysteine, the same form found in the hyperaccumulator plant, whereas related sensitive moths accumulate selenocysteine. The latter is toxic because of its nonspecific incorporation into proteins. Indeed, the Se-tolerant diamondback moth incorporated less Se into protein. Additionally, the tolerant variety sequestered Se in distinct abdominal areas, potentially involved in detoxification and larval defense to predators. CONCLUSIONS Although Se hyperaccumulation protects plants from herbivory by some invertebrates, it can give rise to the evolution of unique Se-tolerant herbivores and thus provide a portal for Se into the local ecosystem. In a broader context, this study provides insight into the possible ecological implications of using Se-enriched crops as a source of anti-carcinogenic selenocompounds and for the remediation of Se-polluted environments.
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Affiliation(s)
- John L Freeman
- Biology Department, Colorado State University, Fort Collins, Colorado 80523, USA
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14
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Springer YP, Hardcastle BA, Gilbert GS. Soil calcium and plant disease in serpentine ecosystems: a test of the pathogen refuge hypothesis. Oecologia 2006; 151:10-21. [PMID: 17024377 DOI: 10.1007/s00442-006-0566-1] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2006] [Accepted: 08/29/2006] [Indexed: 11/25/2022]
Abstract
Ecologists have long sought mechanistic explanations for the patterns of plant distribution and endemism associated with serpentine soils. We conducted the first empirical test of the serpentine pathogen refuge hypothesis, which posits that the low levels of calcium found in serpentine soils provide associated plants with a refuge from attack by pathogens. We measured the range of soil calcium concentrations experienced by 16 wild population of California dwarf flax (Hesperolinon californicum) and experimentally recreated part of this range in the greenhouse by soaking serpentine soils in calcium chloride solutions of varying molarity. When flax plants grown in these soils were inoculated with spores of the rust fungus Melampsora lini we found a significant negative relationship between infection rates and soil calcium concentrations. This result refutes the pathogen refuge hypothesis and suggests that serpentine plants, by virtue of their association with low calcium soils, may be highly vulnerable to attack by pathogens. This interaction between plant nutrition and disease may in part explain demographic patterns associated with serpentine plant populations and suggests scenarios for the evolution of life history traits and the distribution of genetic resistance to infection in serpentine plant communities.
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Affiliation(s)
- Yuri P Springer
- Department of Ecology and Evolutionary Biology, University of California-Santa Cruz, A316 Earth and Marine Sciences Building, Santa Cruz, CA 95064, USA.
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15
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Poschenrieder C, Tolrà R, Barceló J. Can metals defend plants against biotic stress? TRENDS IN PLANT SCIENCE 2006; 11:288-95. [PMID: 16697693 DOI: 10.1016/j.tplants.2006.04.007] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2006] [Revised: 03/15/2006] [Accepted: 04/26/2006] [Indexed: 05/09/2023]
Abstract
Farmers have used metal compounds in phytosanitary treatments for more than a century; however, it has recently been suggested that plants absorb high concentrations of metals from the substrate as a self-defense mechanism against pathogens and herbivores. This metal defense hypothesis is among the most attractive proposals for the 'reason to be' of metal hyperaccumulator species. On a molecular basis, metal defense against biotic stress seems to imply common and/or complementary pathways of signal perception, signal transduction and metabolism. This does not imply a broad band of co-resistance to different stress types but reflects a continuous cross talk during the coevolution of plants, pathogens and herbivores competing in an environment where efficient metal ion acquisition and ion homeostasis are essential for survival.
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Affiliation(s)
- Charlotte Poschenrieder
- Plant Physiology Laboratory, Faculty of Biosciences, Autonomous University of Barcelona, E-08193 Bellaterra, Spain.
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16
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Jiang RF, Ma DY, Zhao FJ, McGrath SP. Cadmium hyperaccumulation protects Thlaspi caerulescens from leaf feeding damage by thrips (Frankliniella occidentalis). THE NEW PHYTOLOGIST 2005; 167:805-14. [PMID: 16101917 DOI: 10.1111/j.1469-8137.2005.01452.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Metal hyperaccumulation has been proposed as a plant defensive strategy. Here, we investigated whether cadmium (Cd) hyperaccumulation protected Thlaspi caerulescens from leaf feeding damage by thrips (Frankliniella occidentalis). Two ecotypes differing in Cd accumulation, Ganges (high) and Prayon (low), were grown in compost amended with 0-1000 mg Cd kg(-1) in two experiments under glasshouse conditions. F2 and F3 plants from the Prayon x Ganges crosses were grown with 5 mg Cd kg(-1). Plants were naturally colonized by thrips and the leaf feeding damage index (LFDI) was assessed. The LFDI decreased significantly with increasing Cd in both ecotypes, and correlated with shoot Cd concentration in a log-linear fashion. Prayon was more attractive to thrips than Ganges, but the ecotypic difference in the LFDI was largely accounted for by the shoot Cd concentration. In the F2 and F3 plants, the LFDI correlated significantly and negatively with shoot Cd, but not with shoot zinc (Zn) or sulphur (S) concentrations. We conclude that Cd hyperaccumulation deters thrips from feeding on T. caerulescens leaves, which may offer an adaptive benefit to the plant.
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Affiliation(s)
- R F Jiang
- Key Laboratory of Plant Nutrition and Nutrient Cycling of Ministry of Agriculture, College of Resources and Environmental Sciences, China Agricultural University, Beijing 100094, China
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17
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Affiliation(s)
- Robert S Boyd
- Department of Biological Sciences, 101 Life Sciences Building, Auburn University, AL 36849-5407, USA (tel +1 334 8441626; fax +1 334 8441645; email )
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Hanson B, Lindblom SD, Loeffler ML, Pilon-Smits EAH. Selenium protects plants from phloem-feeding aphids due to both deterrence and toxicity. THE NEW PHYTOLOGIST 2004; 162:655-662. [PMID: 33873760 DOI: 10.1111/j.1469-8137.2004.01067.x] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
• Certain plant species hyperaccumulate selenium (Se) to 1000 mg kg-1 d. wt, even from low-Se soils. It is not known whether Se hyperaccumulation offers these plants any advantage. In this study the hypothesis was tested that Se can protect plants from phloem-feeding herbivores. • Indian mustard (Brassica juncea) grown with or without Se was subjected to colonization by green peach aphids (Myzus persicae). • In choice feeding experiments the aphids clearly avoided Se-containing plant material, and were able to detect and avoid Se-containing leaves with levels as low as 10 mg Se kg-1 d. wt. In nonchoice feeding experiments aphid population growth was inversely correlated with leaf Se concentration. The leaf Se concentration leading to a 50% reduction in aphid population growth was 1.5 mg kg-1 d. wt, and ≥ 10 mg Se kg-1 d. wt was lethal. • In summary, Se can protect plants from feeding by aphids at leaf levels two orders of magnitude lower than those found in hyperaccumulators in the field. These results shed light on the possible functional significance of Se hyperaccumulation.
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Affiliation(s)
- Brady Hanson
- Department of Biology, Colorado State University, Anatomy/Zoology Building, Fort Collins, CO 80523, USA
| | - Stormy Dawn Lindblom
- Department of Biology, Colorado State University, Anatomy/Zoology Building, Fort Collins, CO 80523, USA
| | - Miriam L Loeffler
- Department of Biology, Colorado State University, Anatomy/Zoology Building, Fort Collins, CO 80523, USA
| | - Elizabeth A H Pilon-Smits
- Department of Biology, Colorado State University, Anatomy/Zoology Building, Fort Collins, CO 80523, USA
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