The Benzoxazinoids DIBOA and DIMBOA are secondary metabolites of grasses that function as natural pesticides. The biosynthesis of the benzoxazinoid pathway has been elucidated in maize (Zea mays) and branches off the tryptophan biosynthesis pathway. An extensive expression analysis of the biosynthesis genes was carried out on RNA and protein level. The development specific expression pattern of the DIMBOA biosynthesis genes is identical in all three existing root types of maize. The highest expression of the DIMBOA biosynthesis genes was found in the differentiation zone, whereas the highest amount of DIMBOA was found in the root tip. This leads to the assumption that the metabolite is being transported.
«