Circadian regulation of hormone signaling and plant physiology
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The survival and reproduction of plants depend on their ability to cope with a wide range of daily and seasonal environmental fluctuations during their life cycle. Phytohormones are plant growth regulators that are involved in almost every aspect of growth and development as well as plant adaptation to myriad abiotic and biotic conditions. The circadian clock, an endogenous and cell-autonomous biological timekeeper that produces rhythmic outputs with close to 24-h rhythms, provides an adaptive advantage by synchronizing plant physiological and metabolic processes to the external environment. The circadian clock regulates phytohormone biosynthesis and signaling pathways to generate daily rhythms in hormone activity that fine-tune a range of plant processes, enhancing adaptation to local conditions. This review explores our current understanding of the interplay between the circadian clock and hormone signaling pathways.
KeywordsCircadian clock Hormone Signaling Growth Immunity Adaptation
Work in the Harmer laboratory is supported by Grants R01 GM 069418 from the National Institutes of Health and IOS 1238040 from the National Science Foundation.
H.S.A and S.L.H both contributed to the writing of this manuscript.
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