UDP-glycosyltransferase that glucosylates coniferyl aldehyde to form coniferyl aldehyde 4-O-glucoside (PubMed:15907484). Glucosylates sinapyl aldehyde to form sinapyl aldehyde 4-O-glucoside (PubMed:15907484). Is not active in presence of coniferyl alcohol or sinapyl alcohol (PubMed:15907484). Can glucosylate the phytotoxic xenobiotic compound 2,4,5-trichlorophenol (TCP) (PubMed:15907484). (E)-coniferaldehyde + UDP-alpha-D-glucose = 4-O-(beta-D-glucosyl)-4-trans-coniferyl aldehyde + H(+) + UDP (E)-sinapaldehyde + UDP-alpha-D-glucose = 4-O-(beta-D-glucosyl)-4-trans-sinapoyl aldehyde + H(+) + UDP Interacts with SIS8. Colocalizes with SIS8 in the nucleus. Expressed in seedlings, roots and leaves. No visible phenotype under normal growth conditions, but mutant plants display a sugar-resistant seedling development phenotype. Belongs to the UDP-glycosyltransferase family. Truncated N-terminus. Truncated N-terminus.