Hydroxamic acids (4-hydroxy-1,4-benzoxazin-3-ones), defence chemicals in the gramineae

Abstract

Hydroxamic acids of the type 4-hydroxy-1,4-benzoxazm-3-ones constitute one of the most extensively studied secondary metabolites m relation to host plant resistance to pests and diseases They play a maJor role in the defence of cereals against insects, fungi and bacteria, in the detoxification of herbicides and in allelopathic effects of the crop Although other mechanisms have also a bearing on these effects, more intensive exploitation of hydroxamic acids in cereal crops 1s indicated.