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THE PLANT CELL, Vol 9, Issue 10 1727-1743, Copyright © 1997 by American Society of Plant Biologists
Attenuation of Phytochrome A and B Signaling Pathways by the Arabidopsis Circadian Clock
S. L. Anderson, D. E. Somers, A. J. Millar, K. Hanson, J. Chory and S. A. Kay
National Science Foundation Center for Biological Timing, Department of Cell Biology, Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037
In higher plants, environmental cues such as light signals are integrated
with circadian clock signals to control precisely the daily rhythms
observed for many biological functions. We have used a fusion of the
promoter of a chlorophyll a/b binding protein gene, CAB2, with firefly
luciferase (cab2::luc) to monitor the detailed kinetics of transcription in
response to photoreceptor activation in Arabidopsis. Using this marker in
phototransduction and circadian-dysfunctional mutants, we studied how
signals from phytochrome and the circadian clock are integrated for the
regulation of CAB2 transcription. Results from these mutant studies
demonstrate that similar expression features, namely, the acute and
circadian responses, are present in both etiolated and green seedlings and
that the acute and circadian responses are genetically separable. We also
demonstrate that persistent Pfr signaling occurs in red light-pulsed
etiolated seedlings, which suggests that the circadian clock antagonizes
Pfr-mediated signal transduction. Based on these genetic studies, we
propose a model for the regulation of CAB2 transcription in which
individual photoreceptors and phototransduction components have been
assigned to specific pathways for the regulation of discrete kinetic
components of the CAB2 expression pattern.
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