MaHeMaEtAl2014

Référence

Ma, Y., He, J., Ma, C., Luo, J., Li, H., Liu, T., Polle, A., Peng, C., Luo, Z.-B. (2014) Ectomycorrhizas with Paxillus involutus enhance cadmium uptake and tolerance in Populus×canescens. Plant, Cell and Environment, 37(3):627-642. (Scopus )

Résumé

Ectomycorrhizas (EMs), which are symbiotic organs formed between tree roots and certain fungi, can mediate cadmium (Cd) tolerance of host plants, but the underlying physiological and molecular mechanisms are not fully understood. Populus×canescens was inoculated with or without Paxillus involutus (strain MAJ) and subsequently exposed to 0 or 50 µM CdSO4. Higher net Cd2+ influx in EMs well corresponded to higher transcript levels of genes involved in Cd2+ uptake, transport and detoxification processes than those in nonmycorrhizal roots. Higher CO2 assimilation, improved nutrient and carbohydrate status, and alleviated oxidative stress were found in mycorrhizal compared to nonmycorrhizal poplars despite higher Cd2+ accumulation. Ectomycorrhizas (EMs), which are symbiotic organs formed between tree roots and certain fungi, can mediate cadmium (Cd) tolerance of host plants, but the underlying physiological and molecular mechanisms are not fully understood. To investigate EMs mediated Cd tolerance in woody plants, Populus×canescens was inoculated with Paxillus involutus (strain MAJ) to establish mycorrhizal roots. Mycorrhizal poplars and non-mycorrhizal controls were exposed to 0 or 50µM CdSO4. EMs displayed higher net Cd2+ influx than non-mycorrhizal roots. Net Cd2+ influx was coupled with net H+ efflux and inactivation of plasma membrane (PM) H+-ATPases reduced Cd2+ uptake of EMs less than of non-mycorrhizal roots. Consistent with higher Cd2+ uptake in EMs, in most cases, transcript levels of genes involved in Cd2+ uptake, transport and detoxification processes were increased in EMs compared to non-mycorrhizal roots. Higher CO2 assimilation, improved nutrient and carbohydrate status, and alleviated oxidative stress were found in mycorrhizal compared to non-mycorrhizal poplars despite higher Cd2+ accumulation. These results indicate that mycorrhizas increase Cd2+ uptake, probably by an enlarged root volume and overexpression of genes involved in Cd2+ uptake and transport, and concurrently enhance Po.×canescensCd tolerance by increased detoxification, improved nutrient and carbohydrate status and defence preparedness. © 2013 John Wiley & Sons Ltd.

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@ARTICLE { MaHeMaEtAl2014,
    AUTHOR = { Ma, Y. and He, J. and Ma, C. and Luo, J. and Li, H. and Liu, T. and Polle, A. and Peng, C. and Luo, Z.-B. },
    TITLE = { Ectomycorrhizas with Paxillus involutus enhance cadmium uptake and tolerance in Populus×canescens },
    JOURNAL = { Plant, Cell and Environment },
    YEAR = { 2014 },
    VOLUME = { 37 },
    PAGES = { 627-642 },
    NUMBER = { 3 },
    NOTE = { cited By (since 1996)3 },
    ABSTRACT = { Ectomycorrhizas (EMs), which are symbiotic organs formed between tree roots and certain fungi, can mediate cadmium (Cd) tolerance of host plants, but the underlying physiological and molecular mechanisms are not fully understood. Populus×canescens was inoculated with or without Paxillus involutus (strain MAJ) and subsequently exposed to 0 or 50 µM CdSO4. Higher net Cd2+ influx in EMs well corresponded to higher transcript levels of genes involved in Cd2+ uptake, transport and detoxification processes than those in nonmycorrhizal roots. Higher CO2 assimilation, improved nutrient and carbohydrate status, and alleviated oxidative stress were found in mycorrhizal compared to nonmycorrhizal poplars despite higher Cd2+ accumulation. Ectomycorrhizas (EMs), which are symbiotic organs formed between tree roots and certain fungi, can mediate cadmium (Cd) tolerance of host plants, but the underlying physiological and molecular mechanisms are not fully understood. To investigate EMs mediated Cd tolerance in woody plants, Populus×canescens was inoculated with Paxillus involutus (strain MAJ) to establish mycorrhizal roots. Mycorrhizal poplars and non-mycorrhizal controls were exposed to 0 or 50µM CdSO4. EMs displayed higher net Cd2+ influx than non-mycorrhizal roots. Net Cd2+ influx was coupled with net H+ efflux and inactivation of plasma membrane (PM) H+-ATPases reduced Cd2+ uptake of EMs less than of non-mycorrhizal roots. Consistent with higher Cd2+ uptake in EMs, in most cases, transcript levels of genes involved in Cd2+ uptake, transport and detoxification processes were increased in EMs compared to non-mycorrhizal roots. Higher CO2 assimilation, improved nutrient and carbohydrate status, and alleviated oxidative stress were found in mycorrhizal compared to non-mycorrhizal poplars despite higher Cd2+ accumulation. These results indicate that mycorrhizas increase Cd2+ uptake, probably by an enlarged root volume and overexpression of genes involved in Cd2+ uptake and transport, and concurrently enhance Po.×canescensCd tolerance by increased detoxification, improved nutrient and carbohydrate status and defence preparedness. © 2013 John Wiley & Sons Ltd. },
    AUTHOR_KEYWORDS = { Carbohydrates; Gene expression; Ion flux; Mycorrhiza; Nutrients; Oxidative stress; Plasma membrane proton-ATPases; Poplar },
    CODEN = { PLCED },
    DOCUMENT_TYPE = { Article },
    DOI = { 10.1111/pce.12183 },
    ISSN = { 01407791 },
    KEYWORDS = { biological uptake; cadmium; carbohydrate; carbon dioxide; deciduous tree; defense mechanism; detoxification; ectomycorrhiza; environmental stress; enzyme activity; fungus; gene expression; host plant; inoculation; pollution tolerance, Fungi; Paxillus involutus; Populus },
    SOURCE = { Scopus },
    URL = { http://www.scopus.com/inward/record.url?eid=2-s2.0-84892802186&partnerID=40&md5=1778527f54be60f39e5a1d5add12b01a },
}

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