イネいもち病菌に対するモミラクトンA, Bおよびその誘導体の抗菌活性

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The effects of momilactones A (M-A) and B (M-B) extracted from rice husks, and of their derivatives, momilactone A alcohol (M-A-OH) and momilactone B acetate (M-B-Ac), upon the spore germination, germ tube growth and appressorium formation of rice blast fungus, Pyricularia oryzae Cavara were investigated. Three or six isolates belonging to 3 pathogenic race groups of this fungus were used in this study. The chemicals used were suspended in water containing 0.1 % of Tween 80 and adjusted to the concentrations of 10^<-3>, 10^<-4> and 10^<-5> M, respectively. All chemicals used inhibited spore germination and germ tube growth, but the inhibition % reduced with the elapse of incubation time during treatment. The antifungal activity was highest in M-B, followed by M-B-Ac and M-A-OH, and was least in M-A. The inhibitory activities differed considerably with the isolates used. The ED_<50> values in M-A and M-B of the inhibition of germ tube growth at 9 hr treatment were about 10^<-4>〜10^<-3> M and about 10^<-5>〜10^<-4> M, respectively. Only M-A stimulated the appressorium formation.
1980-09-25