COP1 SUPPRESSOR 6 represses the PIF4 and PIF5 action to promote light-inhibited hypocotyl growth
文献类型： 外文期刊
作者： Lan, Hongxia 1 ; Heng, Yueqin 1 ; Li, Jian 1 ; Zhang, Mengdi 1 ; Bian, Yeting 2 ; Chu, Li 2 ; Jiang, Yan 1 ; Wang, Xuncheng 3 ; Xu, Dongqing 2 ; Deng, Xing Wang 1 ;
作者机构： 1.Southern Univ Sci & Technol, Guangdong Higher Educ Inst, Inst Plant & Food Sci,Dept Biol, Key Lab Mol Design Plant Cell Factory,Sch Life Sc, Shenzhen 518055, Peoples R China
2.Nanjing Agr Univ, Coll Agr, Natl Ctr Soybean Improvement, State Key Lab Crop Genet & Germplasm Enhancement, Nanjing 210095, Peoples R China
3.Beijing Acad Agr & Forestry Sci, Inst Plant & Environm Protect, Beijing Key Lab Environm Friendly Management Frui, Beijing 100097, Peoples R China
4.Peking Univ, State Key Lab Prot & Plant Gene Res, Peking Tsinghua Ctr Life Sci, Sch Adv Agr Sci, Beijing 100871, Peoples R China
5.Peking Univ, Sch Life Sci, Beijing 100871, Peoples R China
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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