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First published online November 20, 2003; 10.1105/tpc.016345

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The Plant Cell, Vol. 15, 2856-2865, December 2003, www.plantcell.org ©2003, American Society of Plant Biologists

TERMINAL FLOWER2, an Arabidopsis Homolog of HETEROCHROMATIN PROTEIN1, Counteracts the Activation of FLOWERING LOCUS T by CONSTANS in the Vascular Tissues of Leaves to Regulate Flowering Time

Shinobu Takada1,a,b and Koji Goto2,a,b

a Research Institute for Biological Sciences, Okayama 716-1241, Japan
b Core Research for Evolutional Science and Technology, Japan Science and Technology Corporation, Saitama 322-0012, Japan

2 To whom correspondence should be addressed. E-mail kgoto{at}v004.vaio.ne.jp; fax 81-866-56-9454

The flowering time of plants is tightly regulated by both promotive and repressive factors. Molecular genetic studies using Arabidopsis have identified several epigenetic repressors that regulate flowering time. TERMINAL FLOWER2 (TFL2), which encodes a homolog of HETEROCHROMATIN PROTEIN1, represses FLOWERING LOCUS T (FT) expression, which is induced by the activator CONSTANS (CO) in response to the long-day signal. Here, we show that TFL2, CO, and FT are expressed together in leaf vascular tissues and that TFL2 represses FT expression continuously throughout development. Mutations in TFL2 derepress FT expression within the vascular tissues of leaves, resulting in daylength-independent early flowering. TFL2 can reduce FT expression even when CO is overexpressed. However, FT expression reaches a level sufficient for floral induction even in the presence of TFL2, suggesting that TFL2 does not maintain FT in a silent state or inhibit it completely; rather, it counteracts the effect of CO on FT activation.




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