Bifunctional glycosyltransferase that can produce both C- and O-glycosidated flavonoids. Converts 2-hydroxynaringenin to isovitexin. Converts eriodictyol to orientin and isoorientin. Converts naringenin and eriodictyol to naringenin 7-O-glucoside and eriodictyol 7-O-glucoside, respectively. Expressed in radicles, hypocotyls and juvenile leaves. Expressed at low levels in roots. Belongs to the UDP-glycosyltransferase family.