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The Plant Cell, Vol. 13, 2659-2670, December 2001, Copyright © 2001,
American Society of Plant Biologists

A Role for LKP2 in the Circadian Clock of Arabidopsis

Thomas F. Schultz1,a, Tomohiro Kiyosue1,b,c, Marcelo Yanovsky1,a, Masamitsu Wadac,d and Steve A. Kay2,a

a Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037
b Gene Research Center, Kagawa University, Miki-cho Kita-gun, Kagawa 761-0795, Japan
c Division of Biological Regulation and Photobiology, National Institute for Basic Biology, Okazaki 444-8585, Japan
d Department of Biological Sciences, Graduate School of Science, Tokyo Metropolitan University, Tokyo 192-0397, Japan

2 To whom correspondence should be addressed. E-mail stevek{at}scripps.edu; fax 858-784-2973

A third member of the ZTL gene family was identified in the Arabidopsis genome and was named LKP2 (for LOV kelch protein2). A cDNA was isolated corresponding to this gene, and plants overexpressing LKP2 were generated. The overexpression of LKP2 resulted in arrhythmic phenotypes for a number of circadian clock outputs in both constant light and constant darkness, long hypocotyls under multiple fluences of both red and blue light, and a loss of photoperiodic control of flowering time. The LKP2 mRNA is not regulated by the circadian clock and was detected in all tissues examined. These results suggest that LKP2 functions either within or very close to the circadian oscillator in Arabidopsis. A model is presented for its mode of action.




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