Glucosyltransferase involved in the last step of benzoxazinoid glucoside biosynthesis. Catalyzes the glucosylation of hydroxamic acids utilizing UDP-glucose as glucose doner, reducing the toxicity of these natural insecticides for storage. Can use DIMBOA and DIBOA as substrates, HMBOA (2-hydroxy-7-methoxy-2H-1,4-benzoxazin-3(4H)-one) and HBOA (2-hydroxy-2H-1,4-benzoxazin-3(4H)-one) with a lower efficiency, but not indole acetic acid or quercitin. DIMBOA + UDP-alpha-D-glucose = DIMBOA beta-D-glucoside + H(+) + UDP DIBOA + UDP-alpha-D-glucose = DIBOA beta-D-glucoside + H(+) + UDP kcat is 11.6 sec(-1) for DIMBOA. kcat is 12.5 sec(-1) for DIBOA. kcat is 22.6 sec(-1) for UDPG. Optimum pH is 8.5. Optimum temperature is 45 degrees Celsius. Expressed at the same levels in roots and shoots. Highly expressed in young seedlings up to 4 days after imbibition. Belongs to the UDP-glycosyltransferase family.