Floral responses to photoperiod are correlated with the timing of rhythmic expression relative to dawn and dusk in Arabidopsis
Floral responses to photoperiod are correlated with the timing of rhythmic expression relative to dawn and dusk in Arabidopsis
复制标题
拟南芥花对光周期的反应与相对于黎明和黄昏的节律表达时间相关
DOI：
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发表时间：
2002
影响因子：
11.1
通讯作者：
I. Carré
中科院分区：
文献类型：
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作者：
L. Roden;Hae;S. Jackson;K. Morris;I. Carré
日长或光周期被认为是控制许多植物开花的季节性信号。日照长度的测量被认为是通过光传导途径与昼夜节律的相互作用来介导的，因此当光与昼夜周期的敏感阶段一致时，开花被诱导（在长日照植物中）或被抑制（在短日照植物中）。为了在兼性长日植物拟南芥中验证这一假设，我们使用了不同的非24小时光/暗周期来改变相对于黎明和黄昏的基因表达的昼夜节律的时间。对昼夜节律的影响与开花时间有关。我们表明，条件下，位移主观的夜间事件，如表达的开花时间调节器常数到光周期的一部分，被认为是较长的日子。这项工作表明，在拟南芥中的白昼长度的感知依赖于调整的相位角的昼夜节律相对于光/暗周期，而不是在测量的绝对持续时间的光和暗。
Daylength, or photoperiod, is perceived as a seasonal signal for the control of flowering of many plants. The measurement of daylength is thought to be mediated through the interaction of phototransduction pathways with a circadian rhythm, so that flowering is induced (in long-day plants) or repressed (in short-day plants) when light coincides with a sensitive phase of the circadian cycle. To test this hypothesis in the facultative long-day plant, Arabidopsis thaliana, we used varying, non-24-hr light/dark cycles to alter the timing of circadian rhythms of gene expression relative to dawn and dusk. Effects on circadian rhythms were correlated with those on flowering times. We show that conditions that displaced subjective night events, such as expression of the flowering time regulator CONSTANS into the light portion of the cycle, were perceived as longer days. This work demonstrates that the perception of daylength in Arabidopsis relies on adjustments of the phase angle of circadian rhythms relative to the light/dark cycle, rather than on the measurement of the absolute duration of light and darkness.
影响因子：
56.9
作者：
Harmer, SL;Hogenesch, LB;Kay, SA
通讯作者：
Kay, SA