文献类型： 外文期刊
作者： Chen, Jiayue 1 ; Yu, Renbo 2 ; Li, Na 1 ; Deng, Zhaoguo 1 ; Zhang, Xinxin 2 ; Zhao, Yaran 1 ; Qu, Chengfu 1 ; Yuan, Yanfang 2 ; Pan, Zhexian 1 ; Zhou, Yangyang 2 ; Li, Kunlun 2 ; Wang, Jiajun 2 ; Chen, Zhiren 1 ; Wang, Xiaoyi 2 ; Wang, Xiaolian 1 ; He, Shu-Nan 1 ; Dong, Juan 6 ; Deng, Xing Wang 2 ; Chen, Haodong 1 ;
作者机构： 1.Tsinghua Univ, Ctr Plant Biol, Sch Life Sci, Beijing 100084, Peoples R China
2.Peking Univ, Sch Adv Agr Sci, State Key Lab Prot & Plant Gene Res, Beijing 100871, Peoples R China
3.Peking Univ, Peking Tsinghua Ctr Life Sci, Sch Life Sci, Beijing 100871, Peoples R China
4.Tsinghua Peking Ctr Life Sci, Beijing 100084, Peoples R China
5.Chinese Acad Trop Agr Sci, Trop Crops Genet Resources Inst, Key Lab Vegetable Res Ctr, Haikou 571101, Peoples R China
6.Rutgers State Univ, Waksman Inst Microbiol, Piscataway, NJ 08854 USA
7.Rutgers State Univ, Dept Plant Biol, New Brunswick, NJ 08901 USA
8.Veminsyn Biotechnol Ltd, Hangzhou 310000, Peoples R China
9.Chinese Acad Sci, Inst Bot, State Key Lab Systemat & Evolutionary Bot, Beijing 100093, Peoples R China
期刊名称：CELL （ 影响因子：64.5； 五年影响因子：57.5 ）
ISSN： 0092-8674
年卷期： 2023 年 186 卷 22 期
页码：
收录情况： SCI
摘要： Gravity controls directional growth of plants, and the classical starch-statolith hypothesis proposed more than a century ago postulates that amyloplast sedimentation in specialized cells initiates gravity sensing, but the molecular mechanism remains uncharacterized. The LAZY proteins are known as key regulators of gravitropism, and lazy mutants show striking gravitropic defects. Here, we report that gravistimulation by reorientation triggers mitogen-activated protein kinase (MAPK) signaling-mediated phosphorylation of Arabidopsis LAZY proteins basally polarized in root columella cells. Phosphorylation of LAZY increases its interaction with several translocons at the outer envelope membrane of chloroplasts (TOC) proteins on the surface of amyloplasts, facilitating enrichment of LAZY proteins on amyloplasts. Amyloplast sedimentation subsequently guides LAZY to relocate to the new lower side of the plasma membrane in columella cells, where LAZY induces asymmetrical auxin distribution and root differential growth. Together, this study provides a molecular interpretation for the starch-statolith hypothesis: the organelle-movement-triggered molecular polarity formation.
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