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Phototropins maintain robust circadian oscillation of PSII operating efficiency under blue light

Litthauer, Suzanne and Battle, Martin W and Lawson, Tracy and Jones, Matthew A (2015) 'Phototropins maintain robust circadian oscillation of PSII operating efficiency under blue light.' The Plant Journal, 83 (6). pp. 1034-1045. ISSN 0960-7412

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The circadian system allows plants to coordinate metabolic and physiological functions with predictable environmental variables such as dusk and dawn. This endogenous oscillator is comprised of biochemical and transcriptional rhythms that are synchronized with a plant's surroundings via environmental signals, including light and temperature. We have used chlorophyll fluorescence techniques to describe circadian rhythms of PSII operating efficiency (Fq′/Fm′) in the chloroplasts of Arabidopsis thaliana. These Fq′/Fm′ oscillations appear to be influenced by transcriptional feedback loops previously described in the nucleus, and are induced by rhythmic changes in photochemical quenching over circadian time. Our work reveals that a family of blue photoreceptors, phototropins, maintain robust rhythms of Fq′/Fm′ under constant blue light. As phototropins do not influence circadian gene expression in the nucleus our imaging methodology highlights differences between the modulation of circadian outputs in distinct subcellular compartments.

Item Type: Article
Uncontrolled Keywords: phototropin; circadian rhythms; chlorophyll fluorescence; PSII operating efficiency; chloroplast; Arabidopsis thaliana
Subjects: Q Science > QK Botany
Divisions: Faculty of Science and Health
Faculty of Science and Health > Life Sciences, School of
SWORD Depositor: Elements
Depositing User: Elements
Date Deposited: 31 Jul 2015 09:53
Last Modified: 15 Jan 2022 00:26

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