抑制因子
生物
赤霉素
开花位点C
拟南芥
心理压抑
转录因子
突变体
多叶的
遗传学
激活剂(遗传学)
细胞生物学
基因
植物
基因表达
作者
Jutarou Fukazawa,Y. Ohashi,Ryûhei Takahashi,Kanako Nakai,Yohsuke Takahashi
出处
期刊:The Plant Cell
[Oxford University Press]
日期:2021-04-01
卷期号:33 (7): 2258-2272
被引量:78
标识
DOI:10.1093/plcell/koab102
摘要
Abstract Flowering is the developmental transition from the vegetative to the reproductive phase. FLOWERING LOCUS T (FT), SUPPRESSOR OF OVEREXPRESSION OF CONSTANS1 (SOC1), and LEAFY (LFY) are floral integrators. These genes are repressed by several floral repressors including EARLY FLOWERING3 (ELF3), SHORT VEGETATIVE PHASE (SVP), TEMPRANILLO1 (TEM1), and TEM2. Although gibberellin (GA) promotes flowering by activating the floral integrator genes, the exact molecular mechanism remains unclear. DELLAs are negative regulators in GA signaling and act as coactivators of the transcription factor GAI ASSOCIATED FACTOR 1 (GAF1). GAs convert the GAF1 complex from a transcriptional activator to a repressor. Here, we show that GAF1 functions in the GA-dependent flowering pathway by regulating FT and SOC1 expression in Arabidopsis thaliana. We identified four flowering repressors, ELF3, SVP, TEM1, and TEM2, as GAF1-target genes. In response to GAs, GAF1 forms a transcriptional repressor complex and promotes the expression of FT and SOC1 through the repression of four flowering repressor genes, ELF3, SVP, TEM1, and TEM2.
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