Mutations in LIKE HETEROCHROMATIN PROTEIN 1 affect flowering time and plant architecture in Arabidopsis
Author:
Gaudin Valérie1, Libault Marc1, Pouteau Sylvie1, Juul Trine1, Zhao Gengchun1, Lefebvre Delphine1, Grandjean Olivier2
Affiliation:
1. Laboratoire de Biologie Cellulaire, 2. Laboratoire de Génétique, INRA, route de St Cyr, 78026 Versailles cedex, France
Abstract
In plants, recent studies have demonstrated links between the regulation of developmental processes and chromatin dynamics and organisation. Analysis of new mutations affecting overall plant architecture, leaf development and flowering time in Arabidopsis has allowed us to clone and characterise LHP1, the Drosophila heterochromatin protein 1 (HP1) homologue. LHP1 has the chromo and chromo shadow domains central to the function of animal proteins. Yeast two hybrid studies and in planta deletion experiments suggest similar modes of action in plants and animals via homodimer formation. In vivo localisation experiments revealed a specific subnuclear protein distribution in foci throughout the nucleus. Our data suggest that LHP1 may act as a main regulator of gene expression in plants, through formation of heterochromatin-like repressive complexes, to control developmental pathways involved in organ and cell size, and the vegetative to reproductive phase transition.
Publisher
The Company of Biologists
Subject
Developmental Biology,Molecular Biology
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