Cyclic hydroxanc acids present in some species of Gramineae have been reported to be Important In resbtace of these plnts to fngi aNd insects. Since The amount of DIMBOA5 (Fig. 1) and its glucoside may total more than 1% of the dry wt of corn plants (14,16). In aqueous solutions near neutral pH, free DIMBOA has been reported to decompose quantitatively to MBOA and formic acid (28,29). This facile decomposition of DIMBOA to MBOA has been used for the measurement of DIMBOA content ofcorn by isotopic dilution (15), spectrofluorometry (3), and IR analysis (22). By each method, MBOA is the compound actually measured, and 100% conversion of DIMBOA to MBOA is assumed.

12,4-Dihydroxy-7-methoxy-2H-1,4-benzoxazin-3(4H) (11) reported that a lyophilized water extract from corn was only slightly inhibitory to most isolates of ECZ; however, it was strongly inhibitory to most other soft rot bacteria. The observed effect was an extension of the duration of the lag phase of growth. No significant effect on growth rate was detected after the lag phase. It was suggested that the differential inhibitor(s) to soft rotting Erwinia species present in the extract could be involved in the resistance of corn to these bacteria.-'Research cooperative with the College of Agricultural and Life Sciences,

No abstract

No abstract