Utilizes UDP-glucose as the sugar donor and catalyzes the formation of O-beta-D-glucosyl-cis-zeatin from cis-zeatin. May regulate active versus storage forms of cytokinins and could have an impact on seed growth (By similarity). cis-zeatin + UDP-alpha-D-glucose = H(+) + O-beta-D-glucosyl-cis-zeatin + UDP Belongs to the UDP-glycosyltransferase family.