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Science 24 February 1995:
Vol. 267. no. 5201, pp. 1163 - 1166
DOI: 10.1126/science.7855596
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Articles

Science, Vol 267, Issue 5201, 1163-1166
Copyright © 1995 by American Association for the Advancement of Science

articles

The regulation of circadian period by phototransduction pathways in Arabidopsis

AJ Millar, M Straume, J Chory, NH Chua, and SA Kay

National Science Foundation (NSF) Center for Biological Timing, Department of Biology, University of Virginia, Charlottesville 22903.

Transgenic Arabidopsis plants expressing a luciferase gene fused to a circadian-regulated promoter exhibited robust rhythms in bioluminescence. The cyclic luminescence has a 24.7-hour period in white light but 30- to 36-hour periods under constant darkness. Either red or blue light shortened the period of the wild type to 25 hours. A phytochrome-deficient mutation lengthened the period in continuous red light but had little effect in continuous blue light, whereas seedlings carrying mutations that activate light-dependent pathways in darkness maintained shorter periods in constant darkness. These results suggest that both phytochrome- and blue light-responsive photoreceptor pathways control the period of the circadian clock.


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Science 267, 1161-1163
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