A critical role of sodium flux via the plasma Membrane Na+/H+ exchanger SOS1 in the salt tolerance of rice

El Mahi Houda, Pérez-Hormaeche Javier, De Luca Anna, Villalta Alonso Irène, Espartero Joaquín, Gámez-Arjona Francisco, Fernández José Luis, Bundó Mireia, Mendoza Imelda, Mieulet Delphine, Lalanne Eric, Lee Sang-Yeol, Yun Dae-Jin, Guiderdoni Emmanuel, Aguilar Manuel, Leidi Eduardo O., Pardo José M., Quintero Francisco J.. 2019. A critical role of sodium flux via the plasma Membrane Na+/H+ exchanger SOS1 in the salt tolerance of rice. Plant Physiology, 180 (2) : 1046-1065.

https://doi.org/10.1104/pp.19.00324

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Quartile : Outlier, Sujet : PLANT SCIENCES

Résumé : Rice (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 reversegenetics 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.

Mots-clés Agrovoc : Oryza sativa, riz, tolérance au sel, stress osmotique, sodium, génétique moléculaire, homéostasie

Mots-clés complémentaires : génétique inverse

Classification Agris : H50 - Troubles divers des plantes
F60 - Physiologie et biochimie végétale
F30 - Génétique et amélioration des plantes

Champ stratégique Cirad : CTS 4 (2019-) - Santé des plantes, des animaux et des écosystèmes

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