5 稲いもち病菌の代謝する植物毒性物質

概要

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Blast caused by Pyricularia oryzae is the most destructive disease of the rice plant in Japan and the metabolites of this fungus have been expected to be responsible for the symptoms of this disease. The ethylacetate extract of the culture broth filtrate of P. oryzae was separated by chromatographies. Pyriculol I which causes a dark-necrotic spot on a rice leaf, and related compound II, IIIa and IIIb were isolated. The structural determinations of these compounds were based on the spectral data, chemical transformations as well as their microbial interconversions. Compounds IV, V and VI were isolated and were found to reduce or stimulate the growth of rice seedlings. The structure of IV was determined by preparing from 2-hydroxyjuglone, and the structure of V and VI were elucidated by comparisons of their spectral data with that of IV. The known compound Tenuazonic acid VII and a diketopiperazine VIII were also isolated as the metabolites of this fungus, theirphytotoxic activities and antifungal activities were studied. An attempt to synthesize pyriculol I and related compounds is in progress.
天然有機化合物討論会の論文
1972-10-01