UDP-glucose-dependent glucosyltransferase catalyzing the c-glucosylation of 2-hydroxyflavanones (2-hydroxynaringenin, 2-hydroxyeriodictyol and 2-hydroxypinocembrin) and phloretin. No activity with flavanones, flavones or flavonols. a 3'-hydro-2'-hydroxy-beta-oxodihydrochalcone + UDP-alpha-D-glucose = a 3'-(beta-D-glucopyranosyl)-2'-hydroxy-beta-oxodihydrochalcone + H(+) + UDP Optimum pH is 6.5-7.0. Optimum temperature is 50-55 degrees Celsius. Expressed in cotyledons. Not detected in flowers, leaves, roots and hypocotyls. Expressed in germinating seeds and during cotyledon development. Belongs to the UDP-glycosyltransferase family.