COP1 SUPPRESSOR 6 represses the PIF4 and PIF5 action to promote light-inhibited hypocotyl growth
文献类型： 外文期刊
第一作者： Lan, Hongxia
作者： Lan, Hongxia;Heng, Yueqin;Li, Jian;Zhang, Mengdi;Jiang, Yan;Deng, Xing Wang;Bian, Yeting;Chu, Li;Xu, Dongqing;Wang, Xuncheng;Deng, Xing Wang;Deng, Xing Wang
作者机构：
关键词： COP1; CSU6; light signaling; photomorphogenesis; PIF4; PIF5
期刊名称：JOURNAL OF INTEGRATIVE PLANT BIOLOGY （ 影响因子：9.106； 五年影响因子：8.241 ）
ISSN： 1672-9072
年卷期： 2022 年 64 卷 11 期
页码：
收录情况： SCI
摘要： Light signaling precisely controls photomorphogenic development in plants. PHYTOCHROME INTERACTING FACTOR 4 and 5 (PIF4 and PIF5) play critical roles in the regulation of this developmental process. In this study, we report CONSTITUTIVELY PHOTOMORPHOGENIC 1 SUPPRESSOR 6 (CSU6) functions as a key regulator of light signaling. Loss of CSU6 function largely rescues the cop1-6 constitutively photomorphogenic phenotype. CSU6 promotes hypocotyl growth in the dark, but inhibits hypocotyl elongation in the light. CSU6 not only associates with the promoter regions of PIF4 and PIF5 to inhibit their expression in the morning, but also directly interacts with both PIF4 and PIF5 to repress their transcriptional activation activity. CSU6 negatively controls a group of PIF4- and PIF5-regulated gene expressions. Mutations in PIF4 and/or PIF5 are epistatic to the loss of CSU6, suggesting that CSU6 acts upstream of PIF4 and PIF5. Taken together, CSU6 promotes light-inhibited hypocotyl elongation by negatively regulating PIF4 and PIF5 transcription and biochemical activity.
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