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JXB Advance Access published online on May 25, 2006
Journal of Experimental Botany, doi:10.1093/jxb/erj169
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© The Author [2006]. Published by Oxford University Press [on behalf of the Society for Experimental Biology]. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org
Received September 20, 2005
Accepted February 22, 2006

RESEARCH PAPER

MGOUN3: evidence for chromatin-mediated regulation of FLC expression

Soazig Guyomarc'h 1, Moussa Benhamed 2, Gaëtan Lemonnier 3, Jean-Pierre Renou 3, Dao-Xiu Zhou 2, and Marianne Delarue 2 *

1 Institut de Biotechnologie des Plantes, UMR CNRS 8618, Bât. 630. Université Paris XI, F-91405 Orsay cedex, France; Present address: Institut für Pflanzenwissenschaften, Altenbergrain 21, CH-3013 Bern, Switzerland
2 Institut de Biotechnologie des Plantes, UMR CNRS 8618, Bât. 630. Université Paris XI, F-91405 Orsay cedex, France
3 Unité de Recherche en Génomique Végétale, INRA, 2 rue Gaston Crémieux, F-91057 Evry, France

* To whom correspondence should be addressed.
Marianne Delarue, E-mail: delarue{at}ibp.u-psud.fr


  Abstract

The MGOUN3(MGO3)/BRUSHY1(BRU1)/TONSOKU(TSK) gene of Arabidopsis thaliana encodes a nuclear leucine-glycine-asparagine (LGN) domain protein that may be implicated in chromatin dynamics and genome maintenance. Mutants with defects in MGO3 display a fasciated stem and disorganized meristem structures. The transition to flowering was examined in mgo3 mutants and it was found that, under short days, the mutants flowered significantly earlier than the wild-type plants. Study of flowering-time associated gene expression showed that the floral transition inhibitor gene FLC was under-expressed in the mutant background. Ectopic expression of the flower-specific genes AGAMOUS (AG), PISTILLATA (PI), and SEPALLATA3 (SEP3) in mgo3 vegetative organs was also detected. Western blot and chromatin immunoprecipitation experiments suggested that histone H3 acetylation may be altered in the mgo3 background. Together, these data suggest that MGO3 is required for the correct transition to flowering and that this may be mediated by histone acetylation and associated changes in FLC expression.

Keywords: Arabidopsis thaliana; BRU1; chromatin dynamics; FLC; histone modifications; MGO3; TSK.
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