イネ小球菌核病菌の菌核形成に関与する物質

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When the rice stem rot fungus (Leptosphaeria salvinii Cattaneo) is cultured for a long time, most of the isolates lose their ability to produce sclerotia. Such sterile isolates, however, regained their ability, when the decoctions of leaves, leaf-sheaths and stems of rice plant were added to culture media. It is suggested that some substances involved in rice plant may play a difinite role in this recovery of ability for sclerotia production. The bioactive substances were not extracted by distilled water, alcohol, acetone, ether, HCl, H 2S0 4, or NaOH. Because of insolubility in these solvents, it was inferred that nucleic acid may be one of the suspected substances. When RNA was added to the synthetic liquid media at a rate of 4〜8 mg per litre, the isolates which had ceased to produce sclerotia, came to form sclerotia. On the synthetic media added with DNA at a rate of 4 mg per litre, however, sclerotia production was not incited. In the cells of mycelia and pseudoparenchyma of sclerotia, developed on RNA-added synthetic media, oil drops were found more abundantly than in those grown on RNA-absent media. Lipase activity of mycelia was found to be increased by addition of RNA to the medium. Such increase of the fatty substances in the vegetative mycelium may represent a preparative stage for the formation of sclerotia. The paper-electrophoresis patterns obtained with the extracts from mycelia grown on RNA-added media, indicated that there are three protein components, being similar to those obtained with the extract from sclerotia. The extracts from mycelia grown on RNA-absent media showed four protein components. From the results given above, it seems that disturbances in RNA metabolism may be one of the causes for the loss of sclerotia producing ability of the fungus cultured on artificial media.
日本植物病理学会の論文
1960-07-25

イネ小球菌核病菌の菌核形成に関与する物質

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