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

Litthauer, S., Battle, M. W., Lawson, T. and Jones, M. A. (2015) Phototropins maintain robust circadian oscillation of PSII operating efficiency under blue light. Plant Journal, 83(6), pp. 1034-1045. (doi:10.1111/tpj.12947) (PMID:26215041)

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Abstract

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 (F'q/F'm) in the chloroplasts of Arabidopsis thaliana. These F'q/F'm 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 F'q/F'm 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:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Jones, Dr Matt
Authors: Litthauer, S., Battle, M. W., Lawson, T., and Jones, M. A.
College/School:College of Medical Veterinary and Life Sciences > Institute of Molecular Cell and Systems Biology
Journal Name:Plant Journal
Publisher:Wiley
ISSN:0960-7412
ISSN (Online):1365-313X
Published Online:28 July 2015

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