Projects per year
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.
Original language | English |
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Pages (from-to) | 10523-10528 |
Number of pages | 6 |
Journal | Proceedings of the National Academy of Sciences (PNAS) |
Volume | 115 |
Issue number | 41 |
Early online date | 25 Sept 2018 |
DOIs | |
Publication status | Published - 9 Oct 2018 |
Keywords / Materials (for Non-textual outputs)
- Arabidopsis
- circadian rhythms
- photoperiodism
- phytochrome
- systems biology
Fingerprint
Dive into the research topics of 'Dawn and photoperiod sensing by phytochrome A'. Together they form a unique fingerprint.Projects
- 2 Finished
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14 ERA-CAPS PHYTOCAL: Phytochrome Control of Resource Allocation and Growth in Arabidopsis and in Brassicaceae crops
Halliday, K. (Principal Investigator), Krahmer, J. (Researcher) & Romanowski, A. (Researcher)
1/10/15 → 30/03/19
Project: Research
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Bilateral NSF/BIO-BBSRC: Modelling Light Control of Development
Halliday, K. (Principal Investigator), Grima, R. (Co-investigator), Furniss, J. (Researcher), Seaton, D. (Researcher) & Urquiza garcía, J. (Researcher)
1/09/15 → 31/03/19
Project: Research
Profiles
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Karen Halliday
- School of Biological Sciences - Personal Chair of Systems Physiology
- Global Academy of Agriculture and Food Systems
Person: Academic: Research Active