Histone modifications and expression of DAM6 gene in peach are modulated during bud dormancy release in a cultivar-dependent manner
Article first published online: 7 SEP 2011
© 2011 The Authors. New Phytologist © 2011 New Phytologist Trust
Volume 193, Issue 1, pages 67–80, January 2012
How to Cite
Leida, C., Conesa, A., Llácer, G., Badenes, M. L. and Ríos, G. (2012), Histone modifications and expression of DAM6 gene in peach are modulated during bud dormancy release in a cultivar-dependent manner. New Phytologist, 193: 67–80. doi: 10.1111/j.1469-8137.2011.03863.x
- Issue published online: 2 DEC 2011
- Article first published online: 7 SEP 2011
- Received: 9 June 2011, Accepted: 1 August 2011
- bud dormancy;
- chromatin immunoprecipitation (ChIP);
- histone H3;
- Prunus persica (peach);
- •Bud dormancy release in many woody perennial plants responds to the seasonal accumulation of chilling stimulus. MADS-box transcription factors encoded by DORMANCY ASSOCIATED MADS-box (DAM) genes in peach (Prunus persica) are implicated in this pathway, but other regulatory factors remain to be identified. In addition, the regulation of DAM gene expression is not well known at the molecular level.
- •A microarray hybridization approach was performed to identify genes whose expression correlates with the bud dormancy-related behaviour in 10 different peach cultivars. Histone modifications in DAM6 gene were investigated by chromatin immunoprecipitation in two different cultivars.
- •The expression of DAM4–DAM6 and several genes related to abscisic acid and drought stress response correlated with the dormancy behaviour of peach cultivars. The trimethylation of histone H3 at K27 in the DAM6 promoter, coding region and the second large intron was preceded by a decrease in acetylated H3 and trimethylated H3K4 in the region of translation start, coinciding with repression of DAM6 during dormancy release.
- •Analysis of chromatin modifications reinforced the role of epigenetic mechanisms in DAM6 regulation and bud dormancy release, and highlighted common features with the vernalization process in Arabidopsis thaliana and cereals.