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

  • El Mahi H Instituto de Recursos Naturales y Agrobiologia (IRNAS), Consejo Superior de Investigaciones Científicas (CSIC), 41012 Seville, Spain.
  • Pérez-Hormaeche J Instituto de Bioquimica Vegetal y Fotosintesis (IBVF), Consejo Superior de Investigaciones Científicas (CSIC) and University of Seville, 41092 Seville, Spain.
  • De Luca A Instituto de Bioquimica Vegetal y Fotosintesis (IBVF), Consejo Superior de Investigaciones Científicas (CSIC) and University of Seville, 41092 Seville, Spain.
  • Villalta I Institut de Recherche sur la Biologie de l'Insecte, Université de Tours, Parc de Grandmont, 37200 Tours, France.
  • Espartero J Instituto de Recursos Naturales y Agrobiologia (IRNAS), Consejo Superior de Investigaciones Científicas (CSIC), 41012 Seville, Spain.
  • Gámez-Arjona F Swiss Federal Institute of Technology in Zurich, Zurich CH-8092, Switzerland.
  • Fernández JL Instituto de Investigación y Formación Agraria y Pesquera (IFAPA), Junta de Andalucia, 41200 Seville, Spain.
  • Bundó M Centre for Research in Agricultural Genomics (CRAG), CSIC-IRTA-UAB-UB, Campus Universitat Autonoma de Barcelona (UAB), 08193 Barcelona, Spain.
  • Mendoza I Instituto de Bioquimica Vegetal y Fotosintesis (IBVF), Consejo Superior de Investigaciones Científicas (CSIC) and University of Seville, 41092 Seville, Spain.
  • Mieulet D Centre for International Cooperation on Agricultural Research for Development (CIRAD), Joint Research Unit of Genetic Improvement and Adaptation of Mediterranean and Tropical Plants (UMR-AGAP), 34398 Montpellier, and Université de Montpellier, 34000 Montpellier, France.
  • Lalanne E Reig Jofre, 08970 Barcelona, Spain.
  • Lee SY Gyeongsang National University, 660-701 Jinju, South Korea.
  • Yun DJ Konkuk University, 05029 Seoul, South Korea.
  • Guiderdoni E Centre for International Cooperation on Agricultural Research for Development (CIRAD), Joint Research Unit of Genetic Improvement and Adaptation of Mediterranean and Tropical Plants (UMR-AGAP), 34398 Montpellier, and Université de Montpellier, 34000 Montpellier, France.
  • Aguilar M Instituto de Investigación y Formación Agraria y Pesquera (IFAPA), Junta de Andalucia, 41200 Seville, Spain.
  • Leidi EO Instituto de Recursos Naturales y Agrobiologia (IRNAS), Consejo Superior de Investigaciones Científicas (CSIC), 41012 Seville, Spain.
  • Pardo JM Instituto de Bioquimica Vegetal y Fotosintesis (IBVF), Consejo Superior de Investigaciones Científicas (CSIC) and University of Seville, 41092 Seville, Spain.
  • Quintero FJ Instituto de Bioquimica Vegetal y Fotosintesis (IBVF), Consejo Superior de Investigaciones Científicas (CSIC) and University of Seville, 41092 Seville, Spain fjquintero@ibvf.csic.es.
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  • 2019-04-18
Published in:
  • Plant physiology. - 2019
Cell Membrane
DNA, Bacterial
Gene Expression Regulation, Plant
Genetic Complementation Test
Minerals
Mutation
Oryza
Plant Development
Plant Proteins
Plant Roots
Plants, Genetically Modified
Salt Tolerance
Sodium
Sodium-Hydrogen Exchanger 1
Transcriptome
Xylem
English 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 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.
Language
  • English
Open access status
bronze
Identifiers
Persistent URL
https://sonar.ch/global/documents/291700
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