Light-stabilized GIL1 suppresses PIN3 activity to inhibit hypocotyl gravitropism

Xiaolian Wang ¹Yanfang Yuan ²Laurence Charrier ³Zhaoguo Deng ¹Markus Geisler ³Xing Wang Deng ²Haodong Chen⁴

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作者信息

1. Center for Plant Biology,School of Life Sciences,Tsinghua University,Beijing 100084,China;Tsinghua-Peking Center for Life Sciences,Beijing 100084,China
2. School of Advanced Agricultural Sciences and School of Life Sciences,Peking-Tsinghua Center for Life Sciences,Peking University,Beijing 100871,China
3. Department of Biology,University of Fribourg,Fribourg 1700,Switzerland
4. 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
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Abstract

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.

Key words

GIL1/gravitropism/hypocotyls/light/PIN3

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基金项目

National Natural Science Foundation of China(32350001)

National Natural Science Foundation of China(32370306)

National Natural Science Foundation of China(32022005)

Tsinghua University Dushi Program()

Tsinghua-Peking Center for Life Sciences()

Swiss National Funds(31003A_165877)

Swiss National Funds(310030_197563)

出版年

2024

植物学报(英文版)

中国植物学会

植物学报(英文版)

CSTPCDCSCD

影响因子：0.921

ISSN：1672-9072

参考文献量51

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