COLD-REGULATED GENE 27 Integrates Signals from Light and the Circadian Clock to Promote Hypocotyl Growth in Arabidopsis

编号 040025803

推送时间 20200928

研究领域 森林培育 

年份 2020 

类型 期刊 

语种 英语

标题 COLD-REGULATED GENE 27 Integrates Signals from Light and the Circadian Clock to Promote Hypocotyl Growth in Arabidopsis

来源期刊 The Plant Cell

期 第258期

发表时间 20200730

关键词 COR27;  light signaling;  circadian clock;  hypocotyl growth;  Arabidopsis; 

摘要 Light and the circadian clock are two essential external and internal cues affecting seedling development. COLD-REGULATED GENE 27 (COR27), which is regulated by cold temperatures and light signals, functions as a key regulator of the circadian clock. Here, we report that COR27 acts as a negative regulator of light signaling. COR27 physically interacts with the CONSTITUTIVELY PHOTOMORPHOGENIC 1 (COP1)-SUPPRESSOR OF PHYTOCHROME A 1 (SPA1) E3 ubiquitin ligase complex, and undergoes COP1-mediated degradation via the 26S proteasome system in the dark. cor27 mutant seedlings exhibit shorter hypocotyls, while transgenic lines overexpressing COR27 show elongated hypocotyls in the light. In addition, light induces the accumulation of COR27. On one hand, accumulated COR27 interacts with ELONGATED HYPOCOTYL 5 (HY5) to repress HY5 DNA binding activity. On the other hand, COR27 associates with the chromatin at the PHYTOCHROME INTERACTING FACTOR 4 (PIF4) promoter region and up-regulates PIF4 expression in a circadian clock-dependent manner. Together, our findings reveal a mechanistic framework thereby COR27 represses photomorphogenesis in the light and provide insights toward how light and the circadian clock synergistically control hypocotyl growth.

服务人员 孙小满

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