Instituto de Biología Molecular y Celular de Plantas (UPV-CSIC), Valencia, Spain.
Plant Signal Behav. 2011 Sep;6(9):1411-3. doi: 10.4161/psb.6.9.17209.
The circadian clock acts as central coordinator of plant activity, and it regulates key traits for plant fitness such as flowering time, gas exchange, growth, and stress responses. In the May issue of the Proceedings of the National Academy of Science we describe the circadian regulation of gibberellin (GA) signaling, through transcriptional control of GA receptor genes (GID1a and GID1b). We show that, in short day photocycles, the expression of GA receptors oscillates in seedlings, yielding a window of strong GA activity at the end of the night that overlaps with the period of maximum growth. This clock-mediated control of GA signaling is not only crucial for the establishment of rhythmic patterns of growth but also affects the expression of many circadian-controlled genes that participate in a wide range of biological processes. Here we propose a possible mechanism that might operate for the transcriptional control of GID1 expression by the circadian clock.
生物钟作为植物活动的中央协调者，调节着植物适应环境的关键特性，如开花时间、气体交换、生长和应激反应。在 5 月份的《美国国家科学院院刊》上，我们描述了生物钟通过对赤霉素（GA）受体基因（GID1a 和 GID1b）的转录控制，对 GA 信号转导的调节。我们发现，在短日照光周期中，GA 受体在幼苗中呈振荡表达，在夜间结束时产生一个强烈的 GA 活性窗口，与生长的高峰期重叠。这种生物钟介导的 GA 信号转导调控不仅对建立节律性生长模式至关重要，而且还影响着许多参与广泛生物学过程的生物钟控制基因的表达。在这里，我们提出了一种可能的机制，即生物钟可能通过转录控制 GID1 的表达。
