Probably methylates CpG residues and maintains DNA methylation (PubMed:14513380, PubMed:24535433). May be involved in methylation-dependent gene silencing (PubMed:14513380). May play a minor role in the maintenance of DNA methylation (PubMed:24535433). a 2'-deoxycytidine in DNA + S-adenosyl-L-methionine = a 5-methyl-2'-deoxycytidine in DNA + H(+) + S-adenosyl-L-homocysteine Expressed in roots and inflorescences (PubMed:14513380). Expressed in roots, panicles, anthers, pistils, endosperm and imbibed embryos (PubMed:18281124). Expressed in tissues containing actively replicating and dividing cells, such as shoot and root meristems (PubMed:24535433). No visible phenotype under normal growth conditions. Belongs to the class I-like SAM-binding methyltransferase superfamily. C5-methyltransferase family. Truncated N-terminus.