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Phototropins maintain robust circadian oscillation of PSII operating efficiency under blue light
Author(s) -
Litthauer Suzanne,
Battle Martin W.,
Lawson Tracy,
Jones Matthew A.
Publication year - 2015
Publication title -
the plant journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.058
H-Index - 269
eISSN - 1365-313X
pISSN - 0960-7412
DOI - 10.1111/tpj.12947
Subject(s) - phototropin , circadian rhythm , circadian clock , suprachiasmatic nucleus , biology , endogeny , biophysics , arabidopsis thaliana , oscillating gene , microbiology and biotechnology , chloroplast , arabidopsis , cryptochrome , clock , neuroscience , biochemistry , gene , mutant
Summary 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 . TheseFq ′ / 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 ofFq ′ / 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.