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Science. 2013 Mar 15;339(6125):1316-9. doi: 10.1126/science.1230397.

Circadian control of chloroplast transcription by a nuclear-encoded timing signal.

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1
SynthSys, University of Edinburgh, Edinburgh, UK.

Abstract

Circadian timekeeping in plants increases photosynthesis and productivity. There are circadian oscillations in the abundance of many chloroplast-encoded transcripts, but it is not known how the circadian clock regulates chloroplast transcription or the photosynthetic apparatus. We show that, in Arabidopsis, nuclear-encoded SIGMA FACTOR5 (SIG5) controls circadian rhythms of transcription of several chloroplast genes, revealing one pathway by which the nuclear-encoded circadian oscillator controls rhythms of chloroplast gene expression. We also show that SIG5 mediates the circadian gating of light input to a chloroplast-encoded gene. We have identified an evolutionarily conserved mechanism that communicates circadian timing information between organelles with distinct genetic systems and have established a new level of integration between eukaryotic circadian clocks and organelles of endosymbiotic origin.

PMID:
23493713
DOI:
10.1126/science.1230397
[Indexed for MEDLINE]
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