Journal
SCIENCE
Volume 339, Issue 6125, Pages 1316-1319Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1230397
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Funding
- Royal Society
- Royal Society Anglo-Japanese Daiwa Foundation
- Biotechnology and Biological Sciences Research Council [BB/I005811/1]
- Nuffield Foundation
- University of York
- Special Coordination Fund for Promoting Science and Technology
- Ministry of Education, Culture, Sports, Science and Technology of Japan [21770034, 24117505, 24770037, 23120505, 24248061]
- Japan Society for the Promotion of Science [21770034, 24117505, 24770037, 23120505, 24248061]
- Sumitomo Foundation
- Grants-in-Aid for Scientific Research [21770034, 24770037, 24117505] Funding Source: KAKEN
- BBSRC [BB/I005811/2, BB/I005811/1] Funding Source: UKRI
- Biotechnology and Biological Sciences Research Council [BB/I005811/2, BB/I005811/1, 1107454] Funding Source: researchfish
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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.
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