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Science 3 September 1999:
Vol. 285. no. 5433, pp. 1579 - 1582
DOI: 10.1126/science.285.5433.1579
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Reports

Control of Circadian Rhythms and Photoperiodic Flowering by the Arabidopsis GIGANTEA Gene

Deok Hoon Park, 1* David E. Somers, 2* Yang Suk Kim, 1 Yoon Hi Choy, 1 Hee Kyun Lim, 1 Moon Soo Soh, 1 Hyo Jung Kim, 1 Steve A. Kay, 2 Hong Gil Nam 1dagger

Photoperiodic responses in plants include flowering that is day-length-dependent. Mutations in the Arabidopsis thaliana GIGANTEA (GI) gene cause photoperiod-insensitive flowering and alteration of circadian rhythms. The GI gene encodes a protein containing six putative transmembrane domains. Circadian expression patterns of the GI gene and the clock-associated genes, LHY and CCA1, are altered in gi mutants, showing that GI is required for maintaining circadian amplitude and appropriate period length of these genes. The gi-1 mutation also affects light signaling to the clock, which suggests that GI participates in a feedback loop of the plant circadian system.

1 Department of Life Science, Pohang University of Science and Technology, Pohang, Kyungbuk, 790-784, Korea.
2 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.
*   These authors contributed equally to this work.

dagger    To whom correspondence should be addressed. E-mail: hgn{at}bric.postech.ac.kr

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