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Subcellular Localization of GIGANTEA Regulates the Timing of Leaf Senescence and Flowering in Arabidopsis

Title
Subcellular Localization of GIGANTEA Regulates the Timing of Leaf Senescence and Flowering in Arabidopsis
Authors
Kim, HyunminPark, Su JinKim, YumiNam, Hong Gil
DGIST Authors
Kim, Hyunmin; Park, Su Jin; Kim, Yumi; Nam, Hong Gil
Issue Date
2020-11
Citation
Frontiers in Plant Science, 11, 589707
Type
Article
Article Type
Article
Author Keywords
circadian clockleaf senescenceGIGANTEAEARLY FLOWERING 4subcellular localizationORESARA 1Arabidopsis
Keywords
THALIANASYSTEMELF4AGE
ISSN
1664-462X
Abstract
Plants undergo several important developmental transitions including flowering and senescence during their life cycle. Timing these transitions according to the environmental conditions increases plant fitness and productivity. The circadian clock senses various environmental cycles, including photoperiod, and synchronizes plant physiological processes to maximize plant fitness. Here, we propose that the cellular localization of GIGANTEA (GI), a key clock component, regulates leaf senescence and flowering in Arabidopsis thaliana. We show that GI, which connects the circadian clock with photoperiod-regulated flowering, induces leaf senescence depending on its subcellular localization. Overexpression of GI in the gi mutant rescued its delayed senescence phenotype but only when the GI protein was targeted to the nucleus, not when it was targeted to the cytosol. In the nucleus, EARLY FLOWERING 4 (ELF4) inhibited the binding of GI to ORESARA 1 (ORE1) promoter to regulate leaf senescence. GI also positively regulated the day-peak of ORE1 expression. These results indicate that like flowering, leaf senescence is also controlled by the location of GI in the cell. Taken together, our results suggest that ELF4 and GI act together to control flowering and senescence in Arabidopsis. © 2020 Kim, Park, Kim and Nam.
URI
http://hdl.handle.net/20.500.11750/12663
DOI
10.3389/fpls.2020.589707
Publisher
Frontiers Media S.A.
Related Researcher
  • Author Nam, Hong Gil CBRG(Complex Biology Research Group)
  • Research Interests Plant Aging and Life History; Systems Biology; Complexbiology; Comparative Aging Research
Files:
Collection:
Department of New BiologyCBRG(Complex Biology Research Group)1. Journal Articles


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