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

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Science  03 Dec 1999:
Vol. 286, Issue 5446, pp. 1960-1962
DOI: 10.1126/science.286.5446.1960

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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 ofFT causes delay in flowering, whereas overexpression of FT results in precocious flowering independent ofCO 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).

  • * Present address: Research Institute for Biological Sciences, Kayo-cho, Jobo-gun, Okayama 716-1241, Japan.

  • To whom correspondence should be addressed. E-mail: taraqui{at}

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