Journal
SCIENCE
Volume 322, Issue 5909, Pages 1832-1835Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1161403
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Funding
- Leverhulme Trust
- Spanish Ministry of Education and Science
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The circadian oscillator in eukaryotes consists of several interlocking feedback loops through which the expression of clock genes is controlled. It is generally assumed that all plant cells contain essentially identical and cell- autonomous multiloop clocks. Here, we show that the circadian clock in the roots of mature Arabidopsis plants differs markedly from that in the shoots and that the root clock is synchronized by a photosynthesis- related signal from the shoot. Two of the feedback loops of the plant circadian clock are disengaged in roots, because two key clock components, the transcription factors CCA1 and LHY, are able to inhibit gene expression in shoots but not in roots. Thus, the plant clock is organ- specific but not organ- autonomous.
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