COP1 SUPPRESSOR 6 represses the PIF4 and PIF5 action to promote light-inhibited hypocotyl growth

查看全文 作　　者：Hongxia [1]Lan;Yueqin [1]Heng;Jian [1]Li;Mengdi [1]Zhang;Yeting [2]Bian;Li [2]Chu;Yan [1]Jiang;Xuncheng [3]Wang;Dongqing [2]Xu;Xing Wang [1,4]Deng

机构地区：[1]Key Laboratory of Molecular Design for Plant Cell Factory of Guangdong Higher Education Institutes,Department of Biology,Institute of Plant and Food Sciences,School of Life Sciences,Southern University of Science and Technology,Shenzhen 518055,China;[2]State Key Laboratory of Crop Genetics and Germplasm Enhancement,National Center for Soybean Improvement,College of Agriculture,Nanjing Agricultural University,Nanjing 210095,China;[3]Beijing Key Laboratory of Environment Friendly Management on Fruit Diseases and Pests in North China,Institute of Plant and Environment Protection,Beijing Academy of Agriculture and Forestry Sciences,Beijing 100097,China;[4]State Key Laboratory of Protein and Plant Gene Research,Peking‐Tsinghua Center for Life Sciences,School of Advanced Agriculture Sciences and School of Life Sciences,Peking University,Beijing 100871,China

出　　处：《Journal of Integrative Plant Biology》索引2022年第64卷第11期,共14页

基　　金：supported by the National Natural Science Foundation of China(Grant Nos 32100199,31900210,and 31970258);the Peking-Tsinghua Center for Life Sciences(to X.W.D);the Southern University of Science and Technology(to X.W.D);the Jiangsu Natural Science Foundation for Distinguished Young Scholars(Grant No.BK20211525);the Jiangsu'Innovativeand Entrepreneurial Talent'program(to D.X.);the Nanjing Agricultural University(start-up funding to D.X.);the Jiangsu Collaborative Innovation Center for Modern Crop Production(to D.X.). 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. 关键词：COP1 CSU6 light signaling PHOTOMORPHOGENESIS PIF4 PIF5

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COP1 SUPPRESSOR 6 represses the PIF4 and PIF5 action to promote light-inhibited hypocotyl growth

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