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Plant and Cell Physiology Advance Access originally published online on December 20, 2007
Plant and Cell Physiology 2008 49(2):191-200; doi:10.1093/pcp/pcm176
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© The Author 2007. Published by Oxford University Press on behalf of Japanese Society of Plant Physiologists. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

The FLX Gene of Arabidopsis is Required for FRI-Dependent Activation of FLC Expression

Carol R. Andersson, Chris A. Helliwell, David J. Bagnall, Trijntje P. Hughes, E. Jean Finnegan, W. James Peacock and Elizabeth S. Dennis*

CSIRO Plant Industry, GPO Box 1600, Canberra ACT 2601, Australia

*Corresponding author: E-mail, Liz.Dennis{at}csiro.au; Fax, +61-2-6246 5000.


  Abstract

The Arabidopsis FLOWERING LOCUS C (FLC) gene encodes a MADS box protein that acts as a dose-dependent repressor of flowering. Mutants and ecotypes with elevated expression of FLC are late flowering and vernalization responsive. In this study we describe an early flowering mutant in the C24 ecotype, flc expressor (flx), that has reduced expression of FLC. FLX encodes a protein of unknown function with putative leucine zipper domains. FLX is required for FRIGIDA (FRI)-mediated activation of FLC but not for activation of FLC in autonomous pathway mutants. FLX is also required for expression of the FLC paralogs MADS AFFECTING FLOWERING 1 (MAF1) and MAF2.

Keywords: Arabidopsis - FLC activator - Flowering time - FLX Gene - FRI pathway - MADS AFFECTING FLOWERING

Abbreviations: ChIP, chromatin immunoprecipitation; DFC, DOWNSTREAM OF FLC; FLC, FLOWERING LOCUS C; flx, flc expressor; FRI, FRIGIDA; GFP, green fluorescent protein; LB, left border; MAF, MADS AFFECTING FLOWERING; ORF, open reading frame; RB, right border; RNAi, RNA interference; SAM, S-adenosylmethionine; TAIL-PCR, thermal asymmetric interlaced-PCR; UFC, UPSTREAM OF FLC

(Received October 10, 2007; Accepted December 17, 2007)
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Compiled by, F. Tooke, T. Chiurugwi, and N. Battey
Flowering Newsletter bibliography for 2008
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