Probable chromatin-remodeling factor that is functionally redundant with CHR23 in root and shoot stem cell initiation, and root apical meristem (RAM) and shoot apical meristem (SAM) maintenance. Plays an important role in mediating the temporary plant growth arrest induced upon perception of stress (PubMed:17605754, PubMed:23062007). May promote seed maturation and repress initiation of germination (PubMed:24839909). ATP + H2O = ADP + H(+) + phosphate Expressed in root endodermis, cotyledons, young buds, developing cauline leaves, rosette and cauline leaf stipules, sepals of young flower buds, stigma and seeds. No visible phenotype under normal growth conditions, but double mutant plants chr12 and chr23 are embryonic lethal. Belongs to the helicase family.