光形态发生
拟南芥
下胚轴
调节器
生物
突变体
细胞生物学
转录调控
功能(生物学)
光敏色素
拟南芥
隐色素
抄写(语言学)
植物发育
机制(生物学)
遗传学
转录因子
串扰
基因
生物钟
植物
物理
哲学
语言学
量子力学
作者
Xianhai Zhao,Yueqin Heng,Xuncheng Wang,Xing Wang Deng,Xing Wang Deng
标识
DOI:10.1016/j.xplc.2020.100045
摘要
Light is the most important environmental factor affecting many aspects of plant development. In this study, we report that B-box protein 11 (BBX11) acts as a positive regulator of red light signaling. BBX11 loss-of-function mutant seedlings display significantly elongated hypocotyls under conditions of both red light and long day, whereas BBX11 overexpression causes markedly shortened hypocotyls under various light states. BBX11 binds to the HY5 promoter to activate its transcription, while both BBX21 and HY5 associate with the promoter of BBX11 to positively regulate its expression. Taken together, our results reveal positive feedback regulation of photomorphogenesis consisting of BBX11, BBX21, and HY5, thus substantiating a transcriptional regulatory mechanism in the response of plants to light during normal development. BBXs are key regulators of light-dependent development in plants. This study shows that two BBXs, BBX11 and BBX21, together with HY5, form a positive feedback loop to fine-tune photomorphogenic development at the transcriptional level in plants.
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