Responses of ectomycorrhizal Populus tremuloides and Betula papyrifera seedlings to salinity |
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| Authors: | Huang Yi Mónica Calvo Polanco Michael D. MacKinnon Janusz J. Zwiazek |
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| Affiliation: | 1. College of Environmental Sciences and Engineering, Peking University, Beijing, 100871 China;2. Department of Renewable Resources, University of Alberta, 4-42 Earth Sciences Building, Edmonton, AB, Canada T6G 2E3;3. Syncrude Canada Ltd., Edmonton Research Centre, 9421 17 Avenue, Edmonton, AB, Canada T6N 1H4;1. Departamento de Biodiversidad y Biología Experimental e Instituto de Biodiversidad y Biología Experimental y Aplicada (IBBEA, CONICET-UBA), Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Intendente Güiraldes 2160, Ciudad Universitaria, Pabellón II, (C1428EGA) Buenos Aires, Argentina;2. CERZOS-CONICET, Camino La Carrindanga Km 7, (8000) Bahía Blanca, Argentina;1. College of Biological Sciences and Technology (Box 162), Beijing Forestry University, Beijing 100083, PR China;2. Büsgen-Institut: Forstbotanik und Baumphysiologie, Georg-August Universität Göttingen, Göttingen 37077, Germany;1. College of Biological Sciences and Technology (Box 162) , Beijing Forestry University, Beijing 100083, PR China;2. Büsgen Institute, Forest Botany and Tree Physiology, Georg-August-University of Göttingen, Büsgenweg 2, 37077 Göttingen, Germany;1. Laboratoire Ecologie & Environnement (Unité associée au CNRST, URAC 32), Faculté des Sciences Semlalia, Université Cadi Ayyad, Marrakech, Morocco;2. CIRAD, UMR LSTM, F-34398 Montpellier, France;3. Université de Lyon, Université Lyon 1, CNRS, UMR 5558, Laboratoire de biométrie et biologie évolutive, F-69622 Villeurbanne, France;4. IRD, UMR LSTM, F-34398 Montpellier, France |
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| Abstract: | Roots of trembling aspen (Populus tremuloides Michx.) and paper birch (Betula papyrifera Marsh.) seedlings were inoculated with Hebeloma crustuliniforme or Laccaria bicolor and treated with 25 mM NaCl for 6 weeks. Both tree species appeared to be relatively tolerant of the applied NaCl treatment and did not develop visible leaf symptoms that are characteristic of salt injury. Salt treatment reduced total dry weights in aspen and birch, but did not significantly affect transpiration rates and root hydraulic conductance. Salt-treated ectomycorrhizal aspen maintained higher root hydraulic conductance compared with non-mycorrhizal plants. Na and Cl concentrations increased in shoots and roots of mycorrhizal and non-mycorrhizal aspen and birch in response to NaCl treatment. Roots of NaCl-treated aspen inoculated with H. crustuliniforme had over twofold higher concentrations of Na compared with non-mycorrhizal NaCl-treated plants. Similarly to aspen, Na and Cl concentrations increased in roots and shoots of NaCl-treated birch seedlings. However, in birch, there were no significant differences in Na and Cl concentrations between mycorrhizal and non-mycorrhizal plants. The results suggest that salt exclusion by the ectomycorrhizal associations is host-specific or/and that the processes leading to salt exclusion are activated in ectomycorrhizal plants by a threshold salt level which may vary between plant species. |
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