Release of SOS2 kinase from sequestration with GIGANTEA determines salt tolerance in Arabidopsis

Woe-Yeon Kim, Zahir Ali, Hee Jin Park, Su Jung Park, Joon-Yung Cha, Javier Perez-Hormaeche, Francisco Javier Quintero, Gilok Shin, Mi Ri Kim, Zhang Qiang, Li Ning, Hyeong Cheol Park, Sang Yeol Lee, Ray A. Bressan, Jose M. Pardo, Hans J. Bohnert and Dae-Jin Yun ()
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Woe-Yeon Kim: Plant Molecular Biology and Biotechnology Research Center, Graduate School of Gyeongsang National University
Zahir Ali: Plant Molecular Biology and Biotechnology Research Center, Graduate School of Gyeongsang National University
Hee Jin Park: Plant Molecular Biology and Biotechnology Research Center, Graduate School of Gyeongsang National University
Su Jung Park: Plant Molecular Biology and Biotechnology Research Center, Graduate School of Gyeongsang National University
Joon-Yung Cha: Plant Molecular Biology and Biotechnology Research Center, Graduate School of Gyeongsang National University
Javier Perez-Hormaeche: Instituto de Recursos Naturales y Agrobiologia, Consejo Superior de Investigaciones Cientificas
Francisco Javier Quintero: Instituto de Recursos Naturales y Agrobiologia, Consejo Superior de Investigaciones Cientificas
Gilok Shin: Plant Molecular Biology and Biotechnology Research Center, Graduate School of Gyeongsang National University
Mi Ri Kim: Plant Molecular Biology and Biotechnology Research Center, Graduate School of Gyeongsang National University
Zhang Qiang: Plant Molecular Biology and Biotechnology Research Center, Graduate School of Gyeongsang National University
Li Ning: Plant Molecular Biology and Biotechnology Research Center, Graduate School of Gyeongsang National University
Hyeong Cheol Park: Plant Molecular Biology and Biotechnology Research Center, Graduate School of Gyeongsang National University
Sang Yeol Lee: Plant Molecular Biology and Biotechnology Research Center, Graduate School of Gyeongsang National University
Ray A. Bressan: Plant Molecular Biology and Biotechnology Research Center, Graduate School of Gyeongsang National University
Jose M. Pardo: Instituto de Recursos Naturales y Agrobiologia, Consejo Superior de Investigaciones Cientificas
Hans J. Bohnert: Plant Molecular Biology and Biotechnology Research Center, Graduate School of Gyeongsang National University
Dae-Jin Yun: Plant Molecular Biology and Biotechnology Research Center, Graduate School of Gyeongsang National University

Nature Communications, 2013, vol. 4, issue 1, 1-13

Abstract: Abstract Environmental challenges to plants typically entail retardation of vegetative growth and delay or cessation of flowering. Here we report a link between the flowering time regulator, GIGANTEA (GI), and adaptation to salt stress that is mechanistically based on GI degradation under saline conditions, thus retarding flowering. GI, a switch in photoperiodicity and circadian clock control, and the SNF1-related protein kinase SOS2 functionally interact. In the absence of stress, the GI:SOS2 complex prevents SOS2-based activation of SOS1, the major plant Na+/H+-antiporter mediating adaptation to salinity. GI overexpressing, rapidly flowering, plants show enhanced salt sensitivity, whereas gi mutants exhibit enhanced salt tolerance and delayed flowering. Salt-induced degradation of GI confers salt tolerance by the release of the SOS2 kinase. The GI–SOS2 interaction introduces a higher order regulatory circuit that can explain in molecular terms, the long observed connection between floral transition and adaptive environmental stress tolerance in Arabidopsis.

Date: 2013
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DOI: 10.1038/ncomms2357

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