54 ナシ黒班病菌(Alternaria Kikuchiana Tanaka)の生産する宿主特異的毒素の単離と構造

概要

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The structure of two host-specific phytotoxic metabolites, AK-toxin I and II, isolated from culture broth of Alternaria kikuchiana Tanaka (the fungus causing black spot disease of Japanese pear) were elucidated. Chemical and Spectral data showed AK-toxin I to be the ester consisting of N-acetyl-β-methyl-phenylalanine and 9,10-epoxy-8-hydroxy-9-methyl-2E,4Z,6E-decatrienoic acid (1) and AK-toxin II to be β-demethyl derivative (2). The biological assay showed the same host-specific toxic property as those induced by the causal fungus. The threshold concentration of AK-toxin I inducing nectosis was 10^<-8>M on susceptible cultivar, Nijisseiki. But in the case of resistant cultivar, Chojuro, even 1.2×10^<-4>M solution of AK-toxin I did not induce any necrosis on the leaves.
天然有機化合物討論会の論文
1982-09-10