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 regulati...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 factors PHYTOCHROME-INTERACTING FACTORs(PIFs).phyB promotes the stabilization of BBX9 in light,while BBX9 inhibits the transcriptional activation 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 associates with the promoter regions of BBX9 and transcriptionally up-regulates its expression.Collectively,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.展开更多
基金supported by the Natural Science Foundation of Jiangsu for Distinguished Young Scholars(BK20211525)the Fundamental Research Funds for the Central Universities(YDZX2024045)+3 种基金the National Natural Science Foundation of China(32270256)the Postdoctoral Fellowship Program of CPSF(GZB20240319)the Core Technology Development for Breeding Program of Jiangsu Province(JBGS‐2021‐014)the Jiangsu Collaborative Innovation Center for Modern Crop Production(to D.X.)。
文摘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 factors PHYTOCHROME-INTERACTING FACTORs(PIFs).phyB promotes the stabilization of BBX9 in light,while BBX9 inhibits the transcriptional activation 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 associates with the promoter regions of BBX9 and transcriptionally up-regulates its expression.Collectively,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.
