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First published online September 26, 2003; 10.1105/tpc.014217

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The Plant Cell, Vol. 15, 2476-2488, October 2003, Copyright © 2003,
American Society of Plant Biologists

The Novel MYB Protein EARLY-PHYTOCHROME-RESPONSIVE1 Is a Component of a Slave Circadian Oscillator in Arabidopsis

Norihito Kuno1,a, Simon Geir Møller1,2,b,c, Tomoko Shinomuraa, XiangMing Xuc, Nam-Hai Chuab and Masaki Furuyaa

a Hitachi Advanced Research Laboratory, Saitama 350-0395, Japan
b Laboratory of Plant Molecular Biology, The Rockefeller University, New York, New York 10021
c Department of Biology, University of Leicester, Leicester LE1 7RH, United Kingdom

2 To whom correspondence should be addressed. E-mail sgm5{at}le.ac.uk; fax 44-(0)116-252-3330

Using fluorescent differential display, we identified, from ~8000 displayed bands, a DNA fragment showing rapid induction in response to red light irradiation. This EARLY-PHYTOCHROME-RESPONSIVE1 gene (EPR1) encodes a novel nucleus-localized MYB protein harboring a single MYB domain that is highly similar to the circadian oscillator proteins CCA1 and LHY. EPR1 is regulated by both phytochrome A and phytochrome B, and the red-light induction of EPR1 is not inhibited by cycloheximide, demonstrating that EPR1 represents a primary phytochrome-responsive gene. Our results show that EPR1 overexpression results in enhanced far-red light–induced cotyledon opening and delayed flowering. In wild-type Arabidopsis plants grown in continuous light, the EPR1 transcript exhibits circadian rhythmicity similar to that of CCA1 and LHY. Moreover, EPR1 suppresses its own expression, suggesting that this protein is part of a regulatory feedback loop. Constitutive expression of CCA1 and LHY results in the loss of EPR1 rhythmicity, whereas increased levels of EPR1 have no effect on the central oscillator. We propose that EPR1 is a component of a slave oscillator that contributes to the refinement of output pathways, ultimately mediating the correct oscillatory behavior of target genes.




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