Abstract
Soil salinity is an environmental condition that is currently increasing worldwide. Plant growth under salinity induces osmotic stress and ion toxicity impairing root water and nutrient absorption, but the association with beneficial soil microorganisms has been linked to an improved adaptation to this constraint. The ectomycorrhizal (ECM) symbiosis has been proposed as a key factor for a better tolerance of woody species to salt stress, thanks to the reduction of sodium (Na+) uptake towards photosynthetic organs. Although no precise mechanisms for this enhanced plant salt tolerance have been described yet, in this review, we summarize the knowledge accumulated so far on the role of ECM symbiosis. Moreover, we propose several strategies by which ECM fungi might help plants, including restriction of Na+ entrance into plant tissues and improvement of mineral nutrition and water balances. This positive effect of ECM fungi has been proven in field assays and the results obtained point to a promising application in forestry cultures and reforestation.
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CGG acknowledges the Ecole doctorale “GAIA” (University of Montpellier) for PhD fellowships financed by the French Ministry of Higher Education and Research.
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Guerrero-Galán, C., Calvo-Polanco, M. & Zimmermann, S.D. Ectomycorrhizal symbiosis helps plants to challenge salt stress conditions. Mycorrhiza 29, 291–301 (2019). https://doi.org/10.1007/s00572-019-00894-2
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DOI: https://doi.org/10.1007/s00572-019-00894-2