窒素およびカリ施用量がイネごま葉枯病菌の宿主侵入に及ぼす影響

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In this communication we dealt with the conidial germination and hyphal invasion of Helminthosporium oryzae on or into the leaves of rice plants raised in sand culture with different nutrient solutions. About 98 percent of germinated conidia established their invasion through motor ce11s and the rest through stomatal pore, and no instances invading through other area were recongnized. After the invasion of infection hyphae into motor ce11s, abundant granular substances were deposited in the ce11s. These granular substances were abundant in the ce11s of plants raised with excess potassium (8K and 3K) or excess nitrogen (6N) and a few in the ce11s of plant grown in nitrogen or potassium deficiency (1/4N or l/4K). This granular degeneration of the ce11s seemed to be an indicative of plant resistant to the fungus, the deficient plant being susceptible to the funga1 infection. Although no morpho1ogical difference was observed among the fungal hyphae on the tested plants, the infection hyphae seemed to be 1ittle narrower in the motor ce11s showed high glanular degeneration.(Received June 21,1965)
日本植物病理学会の論文
1966-01-30