title: Role of HD2 genes in seed germination and early seedling growth in Arabidopsis.
abstract: The Arabidopsis HD2 family of histone deacetylases consist of 4 members (HD2A, HD2B, HD2C, HD2D) that play diverse roles in plant development and physiology through chromatin remodelling. Here, we show that the transcripts of HD2 family members selectively accumulate in response to glucose through a HXK1-independent signal transduction pathway during the early stages of seedling growth. Germination was enhanced in hd2a null mutants relative to wild-type seeds. In contrast, hd2c mutants were restrained in germination relative to wild-type seeds. In hd2a/hd2c double mutants, germination was restored to wild-type levels. The data suggests that HD2A and HD2C may have different and opposing functions in germination with the glucose/HD2A pathway acting to restrain germination and the HD2C pathway acting to enhance germination. These pathways may function early in the regulation of seedling germination, independently of the glucose/HXK1/ABA signal transduction pathway, to fine tune the onset of germination.
authors: Department of Biology, Carleton University, Ottawa, ON, K1S 5B6, Canada.
authors: Adam
authors: A
authors: Colville
authors: Reem
authors: R
authors: Alhattab
authors: Ming
authors: M
authors: Hu
authors: Hélène
authors: H
authors: Labbé
authors: Tim
authors: T
authors: Xing
authors: Brian
authors: B
authors: Miki
mesh_terms: D017360:Arabidopsis / Q000235:genetics* / Q000254:growth & development; D029681:Arabidopsis Proteins / Q000235:genetics / Q000378:metabolism*; D018506:Gene Expression Regulation, Plant; D018525:Germination / Q000235:genetics*; D005947:Glucose / Q000378:metabolism; D006655:Histone Deacetylases / Q000235:genetics / Q000378:metabolism*; D005810:Multigene Family; D036226:Seedlings / Q000235:genetics / Q000254:growth & development*; D015398:Signal Transduction
chemical_list: D029681:Arabidopsis Proteins; D006655:Histone Deacetylases; D005947:Glucose