拟南芥生物钟分子机制研究进展

Research Progress of Molecular Mechanism of the Circadian Clock in Arabidopsis

本文主要概述了目前拟南芥生物钟分子机制的研究进展。生物钟通过调控导引节律的相位来调节植物的生理活动。拟南芥生物钟由CCA1、LHY和TOC13个主要基因构成了一个稳定的负反馈环,来调节昼夜节律中各个基因如APRR/TOC15重奏的作用,从而调控昼夜节律的相位。在开花的光周期调控中,提出了外协和模型,其中的关键基因是CO,它与拟南芥的开花时间直接相关。

This paper reviews the current progresses in studying molecular mechanism of the circa- dian clock in plants, especially in Arabidopsis. The circadian clock contributes to plant physiology by regulating the phase of entrained rhythms. A gene circuit of negative feedback comprises 3 main genes: CCA1, LHY, and TOC1. The “external coincidence” model has been proposed for photoperi- odic regulation of flowering time. The key gene in this model, CO, is necessary and sufficient for flowering.