Probably involved in the regulation of chromatin states (Probable). Contributes to RPP7-mediated and basal immunity, especially against Hyaloperonospora arabidopsidis isolate Hiks1. Regulates negatively EDM2-dependent floral transition (PubMed:21830950). Isoform 1 interacts with EDM2 in nucleus. Reduced resistance to Hyaloperonospora arabidopsidis isolate Hiks1. Slight early flowering phenotype.