Growth and development of plants is controlled by external and internal signals. Key internal signals are those generated by hormones and the circadian clock. We highlight interactions between the circadian clock and hormonal signalling networks in regulating the physiology and growth of plants. Microarray analysis has shown that a significant proportion of transcripts involved in hormonal metabolism, catabolism, perception and signalling are also regulated by the circadian clock. In particular, there are interactions between the clock and abscisic acid, auxin, cytokinin and ethylene signalling. We discuss the role of circadian modulation ('gating') of hormonal signals in preventing temporally inappropriate responses. A consideration of the daily changes in physiology provides evidence that circadian gating of hormonal signalling couples the rhythmic regulation of carbon and water utilisation to rhythmic patterns of growth.

中文翻译：

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植物中昼夜节律和激素信号之间的相互作用。

植物的生长发育受外部和内部信号控制。关键的内部信号是由激素和生物钟产生的信号。我们强调生物钟和激素信号网络之间在调节植物生理和生长方面的相互作用。微阵列分析表明，参与激素代谢、分解代谢、感知和信号传导的大部分转录本也受到生物钟的调节。特别是，时钟与脱落酸、生长素、细胞分裂素和乙烯信号之间存在相互作用。我们讨论了激素信号的昼夜节律调节（“门控”）在防止暂时不适当的反应中的作用。