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Light modulates the gravitropic responses through organ-specific PIFs and HY5 regulation of LAZY4 expression in Arabidopsis

文献类型： 外文期刊

作者： Yang, Panyu 1 ; Wen, Qiming 1 ; Yu, Renbo 1 ; Han, Xue 1 ; Deng, Xing Wang 1 ; Chen, Haodong 1 ;

作者机构： 1.Peking Univ, Peking Tsinghua Ctr Life Sci, Sch Adv Agr Sci & Sch Life Sci, State Key Lab Prot & Plant Gene Res, Beijing 100871, Peoples R China

2.Peking Univ, Peking Tsinghua Ctr Life Sci, Sch Life Sci, Beijing 100871, Peoples R China

3.Southern Univ Sci & Technol, Inst Plant & Food Sci, Dept Biol, Shenzhen 518055, Peoples R China

4.Chinese Acad Trop Agr Sci, Vegetable Res Ctr, Trop Crops Genet Resources Inst, Haikou 571101, Hainan, Peoples R China

关键词： light; gravitropism; PIFs; HY5; LAZY4

期刊名称：PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA （ 影响因子：11.205； 五年影响因子：12.291 ）

ISSN： 0027-8424

年卷期： 2020 年 117 卷 31 期

页码：

收录情况： SCI

摘要： Light and gravity are two key environmental factors that control plant growth and architecture. However, the molecular basis of the coordination of light and gravity signaling in plants remains obscure. Here, we report that two classes of transcription factors, PHYTOCHROME INTERACTING FACTORS (PIFs) and ELONGATED HYPOCOTYL5 (HY5), can directly bind and activate the expression of LAZY4, a positive regulator of gravitropism in both shoots and roots in Arabidopsis. In hypocotyls, light promotes degradation of PIFs to reduce LAZY4 expression, which inhibits the negative grayitropism of hypocotyls. LAZY4 overexpression can partially rescue the negative gravitropic phenotype of pifq in the dark without affecting amyloplast development. Our identification of the PIFs-LAZY4 regulatory module suggests the presence of another role for PIF proteins in gravitropism, in addition to a previous report demonstrating that PIFs positively regulate amyloplast development to promote negative gravitropism in hypocotyls. In roots, light promotes accumulation of HY5 proteins to activate expression of LAZY4, which promotes positive gravitropism in roots. Together, our data indicate that light exerts opposite regulation of LAZY4 expression in shoots and roots by mediating the protein levels of PIFs and HY5, respectively, to inhibit the negative gravitropism of shoots and promote positive gravitropism of roots in Arabidopsis.

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