Webb Alex A R
Department of Plant Sciences, University of Cambridge, Downing Street, CAMBRIDGE, CB2 3EA, UK.
New Phytol. 2003 Nov;160(2):281-303. doi: 10.1046/j.1469-8137.2003.00895.x.
Circadian rhythms regulate many aspects of plant physiology including leaf, organ and stomatal movements, growth and signalling. The genetic identity of some of the components of the core circadian oscillator has recently become known. Similarly, the photoperception and phototransduction pathways that entrain the oscillator to the day and night cycle are being determined. Less clear are the pathways by which the circadian oscillator regulates cellular physiology. Circadian oscillations in cytosolic free calcium might act to transduce the temporal outputs of the circadian oscillator. This hypothesis requires rigorous testing using novel noninvasive technologies. Plants might gain advantage from the circadian clock by being able to predict changes in the environment and coordinate physiological processes, presumably increasing survival and hence, reproductive fitness. Technical advances coupled with cell-specific measurement techniques will allow the advantages of the circadian regulation of physiology to be quantified. Summary 281 I. Introduction 282 II. The circadian clock 283 III. The regulation of cellular physiology by circadian oscillations in cytosolic free Ca 286 IV. The circadian regulation of physiology 292 V. The benefits of the circadian regulation of physiology 298 VI. Future prospects 299 VIII. Conclusions 300 Acknowledgements 300 References 300.
昼夜节律调节植物生理学的许多方面，包括叶片、器官和气孔运动、生长及信号传导。核心昼夜振荡器的一些组成部分的基因特性最近已为人所知。同样，使振荡器与昼夜周期同步的光感知和光转导途径也正在被确定。昼夜振荡器调节细胞生理学的途径则不太清楚。胞质游离钙的昼夜振荡可能起到转导昼夜振荡器的时间输出的作用。这一假设需要使用新型非侵入性技术进行严格测试。植物或许能够通过预测环境变化并协调生理过程从生物钟中获益，大概这会提高存活率，进而提高繁殖适应性。技术进步与细胞特异性测量技术相结合，将使昼夜节律对生理学调节的优势得以量化。总结281 一、引言282 二、生物钟283 三、胞质游离钙的昼夜振荡对细胞生理学的调节286 四、生理学的昼夜节律调节292 五、生理学昼夜节律调节的益处298 六、未来展望299 八、结论300 致谢300 参考文献300
