한빛사 논문
Woe-Yeon Kim1,*, Zahir Ali1,*, Hee Jin Park1,*, Su Jung Park1, Joon-Yung Cha1, Javier Perez-Hormaeche2, Francisco Javier Quintero2, Gilok Shin1, Mi Ri Kim1, Zhang Qiang1, Li Ning1, Hyeong Cheol Park1, Sang Yeol Lee1, Ray A. Bressan1,3,4, Jose M. Pardo2, Hans J. Bohnert1,4,5 & Dae-Jin Yun1
1 Division of Applied Life Science (BK21 Program), Plant Molecular Biology and Biotechnology Research Center, Graduate School of Gyeongsang National University, Jinju 660.701, South Korea. 2 Instituto de Recursos Naturales y Agrobiologia, Consejo Superior de Investigaciones Cientificas, Sevilla 41012, Spain. 3 Department of Horticulture and Landscape Architecture, Purdue University, West Lafayette, Indiana 47907, USA. 4 College of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia. 5 Departments of Plant Biology and of Crop Sciences, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.
* These authors contributed equally to this work.
Correspondence to: Dae-Jin Yun
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.
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