Spatiotemporal bifurcation of HY5-mediated blue- light signaling regulates wood development during secondary growth

• 成果类型: Article
• 署名作者: Hwang, Hyeona; Lim, Yookyung; Oh, Myung - Min; Choi, Hyunmo; Shim, Donghwan; Song, Young Hun; Cho, Hyunwoo
• 署名单位: Chungbuk National University; Chungbuk National University; National Institute of Forest Science (NIFOS), Republic of South Korea; Korea Forest Research Institute (KFRI); Chungnam National University; Seoul National University (SNU)
• 刊物名称: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
• ISSN/ISSBN: 0027-13192
• DOI: 10.1073/pnas.2407524121
• 发表日期: 2024-12-03
• 关键词: transcription factor; arabidopsis-hypocotyl; wall biosynthesis; gene-expression; direct target; hy5; root; snd1; transduction; mutants

摘要

Plants have evolved photoreceptors to optimize their development during primary growth, including germination, hypocotyl elongation, cotyledon opening, and root growth, allowing them to adapt to challenging light conditions. The light signaling transduction pathway during seedling establishment has been extensively studied, but little molecular evidence is available for light- regulated secondary growth, and how light regulates cambium- derived tissue production remains largely unexplored. Here, we show that CRYPTOCHROME (CRY)- dependent blue light signaling and the subsequent attenuation of ELONGATED HYPOCOTYL 5 (HY5) movement to hypocotyls are key inducers of xylem fiber differentiation in Arabidopsis thaliana. Using grafted chimeric plants and hypocotyl- specific transcriptome sequencing of light signaling mutants under controlled light conditions, we demonstrate that the perception of blue light by CRYs secondary growth of hypocotyls. We propose that HY5 is a blue light-responsive mobile the nucleus, impede its long- distance transport from leaf to hypocotyl, and they initiate during secondary growth.