The Dof transcription factor COG1 acts as a key regulator of plant biomass by promoting photosynthesis and starch accumulation

生物 光合作用 玫瑰花结(裂殖体外观) 拟南芥 光合能力 转录因子 光合效率 淀粉 细胞生物学 突变体 转录组 植物 基因 基因表达 生物化学 免疫学
作者
Zhuoyun Wei,Haoyong Zhang,Fang Meng,Shisheng Lin,Mingsong Zhu,Yuxiu Li,Limin Jiang,Tongtong Cui,Yanwei Cui,Kui Hong,Liang Peng,Xiaoping Gou,Jia Li
出处
期刊:Molecular Plant [Elsevier]
卷期号:16 (11): 1759-1772 被引量:3
标识
DOI:10.1016/j.molp.2023.09.011
摘要

Abstract

Photosynthetic efficiency is the primary determinant of crop yield, including vegetative biomass and grain yield. Manipulation of key transcription factors known to directly control photosynthetic machinery can be an effective strategy to improve photosynthetic traits. In this study, we identified an Arabidopsis gain-of-function mutant, cogwheel1-3D, that shows a significantly enlarged rosette and increased biomass compared with wild-type plants. Overexpression of COG1, a Dof transcription factor, recapitulated the phenotype of cogwheel1-3D, whereas knocking out COG1 and its six paralogs resulted in a reduced rosette size and decreased biomass. Transcriptomic and quantitative reverse transcription polymerase chain reaction analyses demonstrated that COG1 and its paralogs were required for light-induced expression of genes involved in photosynthesis. Further chromatin immunoprecipitation and electrophoretic mobility shift assays indicated that COG1 can directly bind to the promoter regions of multiple genes encoding light-harvesting antenna proteins. Physiological, biochemical, and microscopy analyses revealed that COG1 enhances photosynthetic capacity and starch accumulation in Arabidopsis rosette leaves. Furthermore, combined results of bioinformatic, genetic, and molecular experiments suggested that the functions of COG1 in increasing biomass are conserved in different plant species. These results collectively demonstrated that COG1 acts as a key regulator of plant biomass by promoting photosynthesis and starch accumulation. Manipulating COG1 to optimize photosynthetic capacity would create new strategies for future crop yield improvement.
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