Glycosyltransferase that possesses phloretin 2'-O-glycosyltransferase activity. Converts phloretin to phlorizin (phloretin 2'-O-glucoside), a potent antioxidant. Is specific for phloretin and does not possess glycosyltransferase activity toward caffeic acid, catechin, chlorogenic acid, 2-coumaric acid, 3-coumaric acid, 4-coumaric acid, cyanidin, 3,4-dihydroxyhydrocinnamic acid, epicatechin, 3-hydroxybenzoic acid, naringenin, 3,4-dihydroxybenzoic acid, quercetin and rutin. Can glycosylate phloretin in the presence of UDP-glucose, UDP-xylose and UDP-galactose. phloretin + UDP-alpha-D-glucose = H(+) + phlorizin + UDP Belongs to the UDP-glycosyltransferase family.