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Science 20 November 1998:
Vol. 282. no. 5393, pp. 1488 - 1490
DOI: 10.1126/science.282.5393.1488
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Reports

Phytochromes and Cryptochromes in the Entrainment of the Arabidopsis Circadian Clock

David E. Somers, Paul F. Devlin, Steve A. Kay *

Circadian clocks are synchronized by environmental cues such as light. Photoreceptor-deficient Arabidopsis thaliana mutants were used to measure the effect of light fluence rate on circadian period in plants. Phytochrome B is the primary high-intensity red light photoreceptor for circadian control, and phytochrome A acts under low-intensity red light. Cryptochrome 1 and phytochrome A both act to transmit low-fluence blue light to the clock. Cryptochrome 1 mediates high-intensity blue light signals for period length control. The presence of cryptochromes in both plants and animals suggests that circadian input pathways have been conserved throughout evolution.

Department of Cell Biology and National Science Foundation Center for Biological Timing, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92307, USA.
*   To whom correspondence should be addressed. E-mail: stevek{at}scripps.edu

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Orchestrated Transcription of Key Pathways in Arabidopsis by the Circadian Clock.
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Science. ISSN 0036-8075 (print), 1095-9203 (online)