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Science 12 August 2005:
Vol. 309. no. 5737, pp. 1052 - 1056
DOI: 10.1126/science.1115983
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Research Articles

FD, a bZIP Protein Mediating Signals from the Floral Pathway Integrator FT at the Shoot Apex

Mitsutomo Abe,1* Yasushi Kobayashi,1,2*{dagger} Sumiko Yamamoto,1,2* Yasufumi Daimon,1 Ayako Yamaguchi,1 Yoko Ikeda,1 Harutaka Ichinoki,1 Michitaka Notaguchi,1 Koji Goto,2,3 Takashi Araki1,2,4{ddagger}

FLOWERING LOCUS T (FT) is a conserved promoter of flowering that acts downstream of various regulatory pathways, including one that mediates photoperiodic induction through CONSTANS (CO), and is expressed in the vasculature of cotyledons and leaves. A bZIP transcription factor, FD, preferentially expressed in the shoot apex is required for FT to promote flowering. FD and FT are interdependent partners through protein interaction and act at the shoot apex to promote floral transition and to initiate floral development through transcriptional activation of a floral meristem identity gene, APETALA1 (AP1). FT may represent a long-distance signal in flowering.

1 Department of Botany, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan.
2 CREST, Japan Science and Technology Agency, Kawaguchi 332-0012, Japan.
3 Research Institute for Biological Sciences Okayama, Okayama 716-1241, Japan.
4 Adjunct Division of Applied Genetics, National Institute of Genetics, Mishima 411-8540, Japan.

* These authors contributed equally to this work.

{dagger} Present address: Department of Molecular Biology, Max Planck Institute for Developmental Biology, D-72076 Tübingen, Germany.

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

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