SlCPK27 Cross-links SlHY5 and SlPIF4 in Brassinosteroid-dependent Photo- and Thermo-morphogenesis in Tomato

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 2024 Aug 27

PMID 39190354

Authors

Changan Zhu

Zhangjian Hu

Chaoyi Hu

Hongxue Ma

Jie Zhou

Xiaojian Xia

Kai Shi

Christine H Foyer

Jingquan Yu

Yanhong Zhou

Affiliations

Soon will be listed here.

Abstract

ELONGATED HYPOCOTOYL5 (HY5) and PHYTOCHROME INTERACTING FACTORs (PIFs) are two types of important light-related regulators of plant growth, however, their interplay remains elusive. Here, we report that the activated tomato () HY5 (SlHY5) triggers the transcription of a Calcium-dependent Protein Kinase . SlCPK27 interacts with and phosphorylates SlPIF4 at Ser-252 and Ser-308 phosphosites to promote its degradation. SlPIF4 promotes hypocotyl elongation mainly by activating the transcription of , a key gene in brassinosteroid (BR) biosynthesis. Such a SlHY5-SlCPK27-SlPIF4-BR cascade not only plays a crucial role in photomorphogenesis but also regulates thermomorphogenesis. Our results uncover a previously unidentified mechanism that integrates Ca signaling with the light signaling pathways to regulate plant growth by modulating BR biosynthesis in response to changes in ambient light and temperature.

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