殺菌剤の選択毒性機構に関する研究 : 植物病原菌による pentachloronitrobenzene の吸収, 代謝および蓄積

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The mechanism and the nature of selective toxicity of pentachloronitrobenzene (PC-NB) were studied from the view-point of absorption, metabolism and accumulation of the compound by plant pathogenic fungi. PCNB inhibited strongly the growth of Rhizoctonia solani and an isolate of Botrytis cinerea, but slightly the growth of the other isolate of B. cinerea, Fusarium oxysPorum f. lycopersici, F. oxyspuum f. niveum, and soon. The inhibitory action of PCNB against R. solani was fungistatic. That is, the mycelium inhibited by PCNB grow well when transfered to the PCNB-free medium. when R. solani was successively cultured on the PCNB-containing medium for a long time, the mycelium which was inhibited in growth at an early stage began to grow gradually. The sensitive fungi took up two or three times more PCNB than did the resistant ones. The PCNB-metabolizing ability (detoxifying abillty) of the resistant fungi was stronger than that of the sensitive fungi. A large amount of PCNB accumulated Within the mycelium of sensitive fungi, whereas only sllght amount within the resistant fungal mycelium. The balance between the speed of absorption of PCNB and the detoxication within the fungus may play the first important role on its selective toxicity. (Received June 27, 1969)
日本植物病理学会の論文
1970-03-30