期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 115, 期 41, 页码 10523-10528出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1803398115
关键词
phytochrome; photoperiodism; systems biology; circadian rhythms; Arabidopsis
资金
- Biotechnology and Biological Sciences Research Council [BB/M025551/1, BB/N005147/1]
- NIH [GM079712]
- National Science Foundation [IOS-1656076]
- Next-Generation BioGreen 21 Program (Rural Development Administration, Republic of Korea) [PJ013386]
- Royal Society [RG150711]
- Japan Society for the Promotion of Science
- BBSRC [BB/N005147/1, BB/M025551/1] Funding Source: UKRI
In plants, light receptors play a pivotal role in photoperiod sensing, enabling them to track seasonal progression. Photoperiod sensing arises from an interaction between the plant's endogenous circadian oscillator and external light cues. Here, we characterize the role of phytochrome A (phyA) in photoperiod sensing. Our metaanalysis of functional genomic datasets identified phyA as a principal regulator of morning-activated genes, specifically in short photoperiods. We demonstrate that PHYA expression is under the direct control of the PHYTOCHROME INTERACTING FACTOR transcription factors, PIF4 and PIF5. As a result, phyA protein accumulates during the night, especially in short photoperiods. At dawn, phyA activation by light results in a burst of gene expression, with consequences for physiological processes such as anthocyanin accumulation. The combination of complex regulation of PHYA transcript and the unique molecular properties of phyA protein make this pathway a sensitive detector of both dawn and photoperiod.
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