GT43 family glycotransferases OsGT43A (LOC_Os05g03174), OsGT43E (LOC_Os05g48600), OsGT43H (LOC_Os04g01280), and OsGT43J (LOC_Os06g47340) are predicted or reported facilitate polymerization of ?-(1,4)-linked xylose residues to form the xylan backbone.