Dawn and photoperiod sensing by phytochrome A

Seaton, D.D. and Toledo-Ortiz, G. and Ganpudi, A. and Kubota, A. and Imaizumi, T. and Halliday, K.J. (2018) Dawn and photoperiod sensing by phytochrome A. Proceedings of the National Academy of Sciences of the United States of America, 115 (41). pp. 10523-10528. ISSN 0027-8424

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Abstract

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. © 2018 Proceedings of the National Academy of Sciences of the United States of America. All rights reserved.

Item Type:
Journal Article
Journal or Publication Title:
Proceedings of the National Academy of Sciences of the United States of America
Additional Information:
Copyright 2018 National Academy of Sciences.
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/1000
Subjects:
ID Code:
129517
Deposited By:
Deposited On:
21 Dec 2018 14:55
Refereed?:
Yes
Published?:
Published
Last Modified:
24 Sep 2020 04:24