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Science 286 (5446): 1960-1962

Copyright © 1999 by the American Association for the Advancement of Science

A Pair of Related Genes with Antagonistic Roles in Mediating Flowering Signals

Yasushi Kobayashi, 1 Hidetaka Kaya, 1 Koji Goto, 2 Masaki Iwabuchi, 1* Takashi Araki 1dagger

Flowering in Arabidopsis is promoted via several interacting pathways. A photoperiod-dependent pathway relays signals from photoreceptors to a transcription factor gene, CONSTANS (CO), which activates downstream meristem identity genes such as LEAFY (LFY). FT, together with LFY, promotes flowering and is positively regulated by CO. Loss of FT causes delay in flowering, whereas overexpression of FT results in precocious flowering independent of CO or photoperiod. FT acts in part downstream of CO and mediates signals for flowering in an antagonistic manner with its homologous gene, TERMINAL FLOWER1 (TFL1).

1 Department of Botany, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan.
2 Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan.
*   Present address: Research Institute for Biological Sciences, Kayo-cho, Jobo-gun, Okayama 716-1241, Japan.

dagger    To whom correspondence should be addressed. E-mail: taraqui{at}gr.bot.kyoto-u.ac.jp

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