Journal Article

The <i>FLX</i> Gene of <i>Arabidopsis</i> is Required for <i>FRI</i>-Dependent Activation of <i>FLC</i> Expression

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

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 49, issue 2, pages 191-200
Published in print February 2008 | ISSN: 0032-0781
Published online February 2008 | e-ISSN: 1471-9053 | DOI:
The FLX Gene of Arabidopsis is Required for FRI-Dependent Activation of FLC Expression

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  • Biochemistry
  • Molecular and Cell Biology
  • Plant Sciences and Forestry


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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

Journal Article.  6264 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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