2-oxoglutarate-dependent dioxygenase required for hydroxylation in position C-7 of the benzoxazinoids. Can use 2,4-dihydroxy-2H-1,4-benzoxazin-3(4H)-one 2-D-glucoside (DIBOA-glucoside) as substrate, but not aglucone DIBOA. 2-oxoglutarate + DIBOA beta-D-glucoside + O2 = CO2 + succinate + TRIBOA beta-D-glucoside Binds 1 Fe(2+) ion per subunit. kcat is 2.1 sec(-1) for DIBOA-glucoside. Optimum pH is 6.0. Expressed in seedlings and newly formed crown roots. Highest expression in the scutellar node. Low to non detectable levels in cob, tassel and mature organs like husk or leaves. Peak of expression in 3- and 4-day-old seedlings. Loss of DIMBOA biosynthesis. Belongs to the iron/ascorbate-dependent oxidoreductase family.