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Since the name" vitamin" was given to" accessory food factors" by FUNK in 1911, many papers on the influence of vitamin upon the development of higher animals, bacteria and yeast-fungi have been published by various authors. As far as are aware, very few studies on its action on the causal fungi of plant diseases have been conducted up to the present. The present studies were intended to determine the influence of Oryzanin upon the development of three fungi parasitic on rice-plant, viz. Ophiobolus Miyabeanus ITO et KURIBAYASFII, Gibberella Fujikuroi (SAWADA) WOLLENTW. and Piricularia Oryzae BR. et CAV., assuming some interesting relations between them from the mycological and phytopathological points of view. In the preliminary experiment, the stability of Oryzanin against high temperature and pressure was examined and it was ascertained that it can scarcely be destroyed by an application of the ordinary method of sterilization. So the cultural media containing Oryzanin were sterilized twice in a KOCH'S steam-sterilizer for an hour with a 24 hours' interval throughout the present experiment. As the commercial Oryzanin contains about 15% of alcohol, we also examined its influence upon the development of these 3 fungi. From the experimental results it was noticed that alcohol had almost no influence on Ophiobolus Miyabeanus and Gibberella Fujikuroi by adding it up to about 3% in the cultural media and it seemed to be the same in Piricularia Oryzae. The summarized conclusions of the study are as follows:1. The better development of Ophiobolus Miyabeanus and Piricularia Oryzae was attained by the increased addition of Oryzanin in the cultural media, while it was not the same in the case of Gibberella Fujikuroi, showing that its optimum concentration is about 13%. 2. Formation of conidia of Ophiobolus 111iyabeanus and Gibberella Fujikuroi was accelerated by the addition of Oryzanin to their cultural media.

On the Influence of Oryzanin upon the Development of Some Parasitic Fungi