Journal
GENES
Volume 9, Issue 12, Pages -Publisher
MDPI
DOI: 10.3390/genes9120567
Keywords
circadian clock; phytohormones; growth and development; Arabidopsis thaliana
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Funding
- Spanish Ministry of Economy and Competitiveness [BFU2016-77236-P]
- Generalitat de Catalunya (AGAUR) [2017 SGR 01211]
- CERCA Program/Generalitat de Catalunya
- Spanish Ministry of Economy and Competitiveness through the Severo Ochoa Program for Centers of Excellence in RD [SEV-2015-0533]
- Severo Ochoa Program
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The rotation of the Earth entails changes in environmental conditions that pervasively influence an organism's physiology and metabolism. An internal cellular mechanism known as the circadian clock acts as an internal timekeeper that is able to perceive the changes in environmental cues to generate 24-h rhythms in synchronization with daily and seasonal fluctuations. In plants, the circadian clock function is particularly important and regulates nearly every aspect of plant growth and development as well as proper responses to stresses. The circadian clock does not function in isolation but rather interconnects with an intricate network of different pathways, including those of phytohormones. Here, we describe the interplay of the circadian clock with a subset of hormones in Arabidopsis. The molecular components directly connecting the circadian and hormone pathways are described, highlighting the biological significance of such connections in the control of growth, development, fitness, and survival. We focus on the overlapping as well as contrasting circadian and hormonal functions that together provide a glimpse on how the Arabidopsis circadian system regulates hormone function in response to endogenous and exogenous cues. Examples of feedback regulation from hormone signaling to the clock are also discussed.
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