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Title

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

AuthorsKim, Woe-Yeon; Yun, Dae-Jin; Pérez Hormaeche, J. ; Quintero, Francisco J. ; Pardo, José M.
Issue Date15-Jan-2013
PublisherNature Publishing Group
CitationNature Communications 4 Article number 1352: (2013)
AbstractEnvironmental 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 over-expressing, 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 GISOS2 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.
DescriptionKim, Woe-Yeon et al.--
Publisher version (URL)http://dx.doi.org/10.1038/ncomms2357
URIhttp://hdl.handle.net/10261/64691
DOI10.1038/ncomms2357
E-ISSN2041-1723
Appears in Collections:(IRNAS) Artículos
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