Participates in maintaining the H3K27me3 mark at target genes by interacting with LHP1-PRC2 complexes during replication, thus contributing to H3K27me3 inheritance. Interacts with EZA1/SWN, LHP1, SLD5 and CLF in the nucleus. Expressed in root meristematic zones, initiating lateral roots, young leaves and the shoot apex. Mainly expressed in dividing cells such as primary roots of seedlings (within the meristematic zone but not in the differentiation zone), lateral roots primordia, developiong leaves and shoot apices. Induced by the auxin analog 2,4-D. Enhances phenotypes of the lhp1-3 mutant, thus leading to reduced plant size, early flowering in all photoperiod conditions and altered leaf morphology, associated with an increased expression of H3K27me3-positive genes.