Component of the chromatin assembly factor complex (CAF-1) involved in chromatin assembly following DNA replication and DNA repair. Assembles histone octamers onto replicating DNA in vitro. Required for several aspects of development, including seedling growth and leaf hair differentiation. Plays a critical role in the organization of shoot apical meristem (SAM) and root apical meristem (RAM) during postembryonic development by facilitating stable maintenance of gene expression states. Seems not required to maintain transcriptional repression of heterochromatic genes. Involved in heterologous recombination. May repress endocycle