首页|Light-stabilized GIL1 suppresses PIN3 activity to inhibit hypocotyl gravitropism
Light-stabilized GIL1 suppresses PIN3 activity to inhibit hypocotyl gravitropism
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Light and gravity coordinately regulate the direc-tional growth of plants.Arabidopsis Gravitropic in the Light 1(GIL1)inhibits the negative gravi-tropism of hypocotyls in red and far-red light,but the underlying molecular mechanisms remain elusive.Our study found that GIL1 is a plasma membrane-localized protein.In endodermal cells of the upper part of hypocotyls,GIL1 controls the negative gravitropism of hypocotyls.GIL1 directly interacts with PIN3 and inhibits the auxin transport activity of PIN3.Mutation of PIN3 suppresses the abnormal gravitropic response of gil1 mutant.The GIL1 protein is unstable in darkness but it is sta-bilized by red and far-red light.Together,our data suggest that light-stabilized GIL1 inhibits the negative gravitropism of hypocotyls by sup-pressing the activity of the auxin transporter PIN3,thereby enhancing the emergence of young seedlings from the soil.
GIL1gravitropismhypocotylslightPIN3
Xiaolian Wang、Yanfang Yuan、Laurence Charrier、Zhaoguo Deng、Markus Geisler、Xing Wang Deng、Haodong Chen
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Center for Plant Biology,School of Life Sciences,Tsinghua University,Beijing 100084,China
Tsinghua-Peking Center for Life Sciences,Beijing 100084,China
School of Advanced Agricultural Sciences and School of Life Sciences,Peking-Tsinghua Center for Life Sciences,Peking University,Beijing 100871,China
Department of Biology,University of Fribourg,Fribourg 1700,Switzerland
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National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaTsinghua University Dushi ProgramTsinghua-Peking Center for Life SciencesSwiss National FundsSwiss National Funds
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