该ELF3时序调节器调节向昼夜时钟发送的光信号
H G McWatters1, R M Bastow, A Hall
1Department of Biological Sciences, University of Warwick, Conventry, UK.
Nature
|December 29, 2000
概括
阿拉比多普西斯塔利亚纳中早期开花3 (ELF3) 蛋白调节生物钟的光输入,控制季节性节律,如开花时间. 这项研究揭示了ELF3.
科学领域:
- 植物生物学 植物生物学
- 时间生物学 时间生物学
- 遗传学 是一个遗传学.
背景情况:
- 昼夜系统控制着日常和季节性生物节奏,对于植物开花等过程至关重要.
- 阿拉比多普西斯 (Arabidopsis thaliana) 是一株长日开花植物,它通过一个不被灯光关闭重置的节奏来测量一天的长度.
- 短日植物根据在黄昏时启动的光敏感昼夜节律来衡量夜晚的长度.
研究的目的:
- 研究早期开花3 (ELF3) 基因在Arabidopsis thaliana中调节昼夜节律和光周期的作用.
- 阐明ELF3如何在对昼夜振荡器的光输入门中发挥作用,并影响节律重置.
主要方法:
- 针对昼夜节律和基因表达模式 (CAB基因) 的elf3-7突变植物Arabidopsis thaliana的分析.
- 对11f3突变体的光周期反应和温度携带效应的评估.
- 研究ELF3功能的光传导途径和昼夜振荡器之间的相互作用.
主要成果:
- elf3-7突变体在光线下保留了振荡器功能,但显示了CAB基因激活的白昼门,这表明由于放松光传导的调节导致了掩盖的节律性.
- ELF3突变改变了光周期的重置模式,表明ELF3在关闭光传导以重置节律中的作用.
- 温度引入可以部分挽救节奏CAB表达,并绕过在振荡器中正常ELF3功能的需要.
结论:
- ELF3专门调节昼夜振荡器的光输入,在关闭CAB基因激活中发挥作用,并使振荡器能够在光敏感的主观晚上进行进展.
- 该研究提供了"zeitnehmer" (时间计时器) 概念的实验证据,其中ELF3作为一个关键组件,将环境信号传递到内部时钟.
- 了解ELF3的功能是解读植物季节节律调节背后的机制的关键.
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