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

Proceedings of the National Academy of Sciences of the United States of America
Panyu YangHaodong Chen

Abstract

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 gravitropism 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...Continue Reading

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Citations

Oct 3, 2020·Plants·Shih-Heng SuPatrick H Masson
Jan 11, 2021·Current Opinion in Plant Biology·Jessica Marie Waite, Christopher Dardick
Feb 24, 2021·Plant Physiology·Guiomar Martín, Paula Duque
Mar 24, 2021·Annual Review of Plant Biology·Mei-Chun ChengEnamul Huq
Jul 21, 2021·Current Biology : CB·Xingliang DuanWei Xuan
Jul 14, 2021·The New Phytologist·Huibin HanJiří Friml
Sep 16, 2021·American Journal of Botany·Aránzazu ManzanoF Javier Medina

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