82(PA3-2) 桑輪斑病菌代謝植物毒素の構造(ポスター発表の部)

概要

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A zonate leaf spot disease has spread more and more in mulberry fields in a part of Western Japan. The fungus of this disease was identified as Acrospermum viticola Ikata. In total, 29 species belonging to 24 genera of 16 families were recorded as the host plants for the fungus during the field survey. This fungous disease distributes over the subtropical and tropical zones in the world. Now, we have isolated the phytotoxins, named AV-toxins C(1), A(2) and D(3) from the cultivation of A. viticola, and AV-toxins D(3) and E(4) from the zonate parts of disease leaves. Compounds 1 and 2 were identified as known antibiotics, questiomycin A and N-acetylquestiomycin A, respectively, by chemical and spectroscopic evidence. The structures of 3 and 4 were characterized by various NMR technique(^1H-^1H COSY, ^<13>C-^1H COSY and ^<13>C-^1H long range COSY), comparing with those of 1 and 2 Compounds 3 and 4 are the first examples of phenoxazine derivatives having the methoxyl groups in the C-ring. The above phytotoxins, AV-toxins C, D and E were active in a concentration of ca. 1Oμg/ml by the soaking method.
天然有機化合物討論会の論文
1987-07-25