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A Critical Role of Sodium Flux via the Plasma Membrane Na+/H+ Exchanger SOS1 in the Salt Tolerance of Rice

AuthorsEl Mahi, Houda; Pérez-Hormaeche, Javier; Lucca, Anna De; Villata, Irene; Espartero, Joaquín ; Fernández, José L.; Bundó, Mireia ; Mendoza, Imelda ; Mieulet, Delphine; Lee, Sang-Yheol; Lalanne, Eric; Yun, Dae-Yin; Guiderdoni, Emmanuel; Aguilar, Manuel; Leidi, Eduardo O. ; Pardo, José M. ; Quintero, Francisco J.
Issue Date2019
PublisherAmerican Society of Plant Biologists
CitationPlant Physiology, 180, 2 (2019)
AbstractRice (Oryza sativa) stands among the world's most important crop species. Rice is salt sensitive, and the undue accumulation of sodium ions (Na+) in shoots has the strongest negative correlation with rice productivity under long-term salinity. The plasma membrane Na+/H+ exchanger protein Salt Overly Sensitive 1 (SOS1) is the sole Na+ efflux transporter that has been genetically characterized to date. Here, the importance of SOS1-facilitated Na+ flux in the salt tolerance of rice was analyzed in a reverse-genetics approach. A sos1 loss-of-function mutant displayed exceptional salt sensitivity that was correlated with excessive Na+ intake and impaired Na+ loading into the xylem, thus indicating that SOS1 controls net root Na+ uptake and long-distance Na+ transport to shoots. The acute Na+ sensitivity of sos1 plants at low NaCl concentrations allowed analysis of the transcriptional response to sodicity stress without effects of the osmotic stress intrinsic to high-salinity treatments. In contrast with that in the wild type, sos1 mutant roots displayed preferential down-regulation of stress-related genes in response to salt treatment, despite the greater intensity of stress experienced by the mutant. These results suggest there is impaired stress detection or an inability to mount a comprehensive response to salinity in sos1. In summary, the plasma membrane Na+/H+ exchanger SOS1 plays a major role in the salt tolerance of rice by controlling Na+ homeostasis and possibly contributing to the sensing of sodicity stress.
Publisher version (URL)https://doi.org/10.1104/pp.19.00324
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