Isoflavone 7-O-glucosyltransferase converting daidzein to daidzin, genistein to genistin and formononetin to ononin (PubMed:24700248). Shows some activity toward the flavanones liquiritigenin and naringenin, but not toward cyanidin, isoliquiritigenin, apigenin, luteolin, kaempferol, quercetin, daidzin and puerarin (PubMed:24700248). a 7-hydroxyisoflavone + UDP-alpha-D-glucose = a 7-hydroxyisoflavone 7-O-beta-D-glucoside + H(+) + UDP Expressed in roots. Detected in stems and leaves. Down-regulated by methyl jasmonate. Belongs to the UDP-glycosyltransferase family.