首页|BBX9 forms feedback loops with PIFs and BBX21 to promote photomorphogenic development

BBX9 forms feedback loops with PIFs and BBX21 to promote photomorphogenic development

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Light is one of the most essential environmental factors that tightly and precisely control various physiological and developmental processes in plants.B-box CONTAINING PROTEINs(BBXs)play central roles in the regulation of light-dependent development.In this study,we report that BBX9 is a positive regulator of light signaling.BBX9 interacts with the red light photoreceptor PHYTOCHROME B(phyB)and transcription fac-tors PHYTOCHROME-INTERACTING FACTORs(PIFs).phyB promotes the stabilization of BBX9 in light,while BBX9 inhibits the transcriptional acti-vation activity of PIFs.In turn,PIFs directly bind to the promoter of BBX9 to repress its transcription.On the other hand,BBX9 associates with the positive regulator of light signaling,BBX21,and enhances its biochemical activity.BBX21 asso-ciates with the promoter regions of BBX9 and transcriptionally up-regulates its expression.Col-lectively,this study unveiled that BBX9 forms a negative feedback loop with PIFs and a positive one with BBX21 to ensure that plants adapt to fluctuating light conditions.

ArabidopsisBBX21BBX9light signalingphoto-morphogenesisphyBPIF

Zhaoqing Song、Wanying Ye、Qing Jiang、Huan Lin、Qing Hu、Yuntao Xiao、Yeting Bian、Fengyue Zhao、Jie Dong、Dongqing Xu

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State Key Laboratory of Crop Genetics & Germplasm Enhancement and Utilization,National Center for Soybean Improvement,College of Agriculture,Nanjing Agricultural University,Nanjing 210095,China

Institute of Crop Science,College of Agriculture and Biotechnology,Zhejiang University,Hangzhou 310058,China

Natural Science Foundation of Jiangsu for Distinguished Young ScholarsFundamental Research Funds for the Central UniversitiesNational Natural Science Foundation of ChinaPostdoctoral Fellowship Program of CPSFCore Technology Development for Breeding Program of Jiangsu ProvinceJiangsu Collaborative Innovation Center for Modern Crop Production

BK20211525YDZX202404532270256GZB20240319JBGS-2021-014

2024

10.1111/jipb.13746

植物学报(英文版)
中国植物学会

植物学报(英文版)

CSTPCD
影响因子：0.921
ISSN：1672-9072
年,卷(期)：2024.66(9)
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