Root- specific photoreception directs early root development by HY5-regulated ROS balance

• 成果类型: Article
• 署名作者: Li, Jiaojiao; Zeng, Jian; Tian, Zhaoxia; Zhao, Zhong; Raikhel, Natasha
• 署名单位: Chinese Academy of Sciences; University of Science & Technology of China, CAS
• 刊物名称: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
• ISSN/ISSBN: 0027-11196
• DOI: 10.1073/pnas.2313092121
• 发表日期: 2024-01-29
• 关键词: hypocotyl elongation; hy5 transcription; arabidopsis; light; shoot; phytochrome; expression; sensitivity; GROWTH; cop1

摘要

Root development is tightly controlled by light, and the response is thought to depend on signal transmission from the shoot. Here, we show that the root apical meristem perceives light independently from aboveground organs to activate the light- regulated transcription factor ELONGATED HYPOCOTYL5 (HY5). The ROS balance between H2O2 and superoxide anion in the root is disturbed under darkness with increased H2O2. We demonstrate that root- derived HY5 directly activates PER6 expression to eliminate H2O2. Moreover, HY5 directly represses UPBEAT1, a known inhibitor of peroxidases, to release the expression of PERs, partially contributing to the light control of ROS balance in the root. Our results reveal an unexpected ability in roots with specific photoreception and provide a mechanistic framework for the HY5-mediated interaction between light and ROS signaling in early root development.