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Science 3 December 1999:
Vol. 286. no. 5446, pp. 1962 - 1965
DOI: 10.1126/science.286.5446.1962

Reports

Activation Tagging of the Floral Inducer FT

Igor Kardailsky, 12*dagger Vipula K. Shukla, 1*ddagger Ji Hoon Ahn, 1* Nicole Dagenais, 1 Sioux K. Christensen, 1 Jasmine T. Nguyen, 1§ Joanne Chory, 13 Maria J. Harrison, 2 Detlef Weigel 1parallel

FLOWERING LOCUS T (FT), which acts in parallel with the meristem-identity gene LEAFY (LFY) to induce flowering of Arabidopsis, was isolated by activation tagging. Like LFY, FT acts partially downstream of CONSTANS (CO), which promotes flowering in response to long days. Unlike many other floral regulators, the deduced sequence of the FT protein does not suggest that it directly controls transcription or transcript processing. Instead, it is similar to the sequence of TERMINAL FLOWER 1 (TFL1), an inhibitor of flowering that also shares sequence similarity with membrane-associated mammalian proteins.

1 Plant Biology Laboratory, The Salk Institute for Biological Studies, 10010 North Torrey Pines Road, La Jolla, CA 92037, USA.
2 The Samuel Roberts Noble Foundation, Plant Biology Division, 2510 Sam Noble Parkway, Ardmore, OK 73402, USA.
3 Howard Hughes Medical Institute, The Salk Institute for Biological Studies, 10010 North Torrey Pines Road, La Jolla, CA 92037, USA.
*   These authors contributed equally to this work.

dagger    Present address: Plant Gene Expression Center, 800 Buchanan Street, Albany, CA 94710, USA.

ddagger    Present address: Dow AgroSciences, LLC, 9330 Zionsville Road, Indianapolis, IN 46268, USA.

§   Present address: Akkadix Corporation, 11099 North Torrey Pines Road, La Jolla, CA 92037, USA.

parallel    To whom correspondence should be addressed. E-mail: weigel{at}salk.edu


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