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Background  In seeds, the transition from dormancy to germination is regulated by abscisic acid (ABA) and gibberellins (GAs), and involves chromatin remodelling. Particularly, the repressive mark H3K27 trimethylation (H3K27me3) has been shown to target many master regulators of this transition. DAG1 (DOF AFFECTING GERMINATION1), is a negative regulator of seed germination in  Arabidopsis , and directly represses the GA biosynthetic gene  GA3ox1 (gibberellin 3-β-dioxygenase 1 ). We set to investigate the role of DAG1 in seed dormancy and maturation with respect to epigenetic and hormonal control.    Results  We show that  DAG1  expression is controlled at the epigenetic level through the H3K27me3 mark during the seed-to-seedling transition, and that  DAG1  directly represses also the ABA catabolic gene  CYP707A2 ; consistently, the ABA level is lower while the GA level is higher in  dag1  mutant seeds. Furthermore, both DAG1 expression and protein stability are controlled by GAs.    Conclusions  Our results point to DAG1 as a key player in the control of the developmental switch between seed dormancy and germination.    Electronic supplementary material  The online version of this article (doi:10.1186/s12870-016-0890-5) contains supplementary material, which is available to authorized users.

The DAG1 transcription factor negatively regulates the seed-to-seedling transition in Arabidopsis acting on ABA and GA levels