昼夜节律
生物钟
拟南芥
生物
开花位点C
表型
光周期性
遗传学
细胞生物学
内生
定时器
突变体
基因
植物
内分泌学
微控制器
计算机科学
计算机硬件
作者
Paula Suárez‐López,Kay Wheatley,Fran Robson,Hitoshi Onouchi,Federico Valverde,George Coupland
出处
期刊:Nature
[Springer Nature]
日期:2001-04-01
卷期号:410 (6832): 1116-1120
被引量:1257
摘要
Flowering is often triggered by exposing plants to appropriate day lengths. This response requires an endogenous timer called the circadian clock to measure the duration of the day or night. This timer also controls daily rhythms in gene expression and behavioural patterns such as leaf movements. Several Arabidopsis mutations affect both circadian processes and flowering time; but how the effect of these mutations on the circadian clock is related to their influence on flowering remains unknown. Here we show that expression of CONSTANS (CO), a gene that accelerates flowering in response to long days, is modulated by the circadian clock and day length. Expression of a CO target gene, called FLOWERING LOCUS T (FT), is restricted to a similar time of day as expression of CO. Three mutations that affect circadian rhythms and flowering time alter CO and FT expression in ways that are consistent with their effects on flowering. In addition, the late flowering phenotype of such mutants is corrected by overexpressing CO. Thus, CO acts between the circadian clock and the control of flowering, suggesting mechanisms by which day length regulates flowering time.
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