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BBX28/BBX29、HY5和BBX30/31形成一个反馈回路,以微调光形态建成发育。

BBX28/BBX29, HY5 and BBX30/31 form a feedback loop to fine-tune photomorphogenic development.

作者信息

Song Zhaoqing, Yan Tingting, Liu Jiujie, Bian Yeting, Heng Yueqin, Lin Fang, Jiang Yan, Wang Deng Xing, Xu Dongqing

机构信息

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

Department of Biology, Institute of Plant and Food Sciences, Southern University of Science and Technology, Shenzhen, 518055, China.

出版信息

Plant J. 2020 Oct;104(2):377-390. doi: 10.1111/tpj.14929. Epub 2020 Aug 6.

Abstract

Light is one of the key environmental cues controlling photomorphogenic development in plants. A group of B-box (BBX) proteins play critical roles in this developmental process through diverse regulatory mechanisms. In this study we report that BBX29 acts as a negative regulator of light signaling. BBX29 interacts with CONSTITUTIVELY PHOTOMORPHOGENIC 1 (COP1) and undergoes COP1-mediated degradation in the dark. Mutant seedlings with loss of BBX29 function show shortened hypocotyls, while transgenic plants overexpressing BBX29 display elongated hypocotyls in the light. Both BBX28 and BBX29 interfere with the binding of ELONGATED HYPOCOTYL 5 (HY5) to the promoters of BBX30 and BBX31, consequently leading to the upregulation of their transcript levels. BBX30 and BBX31 associate with the promoter regions of BBX28 and BBX29, which in turn promotes the expression of these genes. Taken together, this study reveals a transcriptional feedback loop consisting of BBX28, BBX29, BBX30, BBX31, and HY5 that serves to fine-tune photomorphogenesis in response to light in plants.

摘要

光是控制植物光形态建成发育的关键环境信号之一。一组B-box(BBX)蛋白通过多种调控机制在这一发育过程中发挥关键作用。在本研究中,我们报道BBX29作为光信号的负调控因子。BBX29与组成型光形态建成1(COP1)相互作用,并在黑暗中经历COP1介导的降解。丧失BBX29功能的突变体幼苗下胚轴缩短,而过量表达BBX29的转基因植物在光照下下胚轴伸长。BBX28和BBX29都干扰了伸长下胚轴5(HY5)与BBX30和BBX31启动子的结合,从而导致它们转录水平的上调。BBX30和BBX31与BBX28和BBX29的启动子区域相关联,进而促进这些基因的表达。综上所述,本研究揭示了一个由BBX28、BBX29、BBX30、BBX31和HY5组成的转录反馈环,该反馈环用于微调植物对光的光形态建成反应。

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