疫病菌と他微生物との相互作用に関する研究 : (3) Phytophthora capsici Leon.の菌糸に対する細菌の随伴現象

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To elucidate the microbial succession in plant tissue rotted by Phytophthora, the association of bacteria with the surface of the hyphae of Phytophthora capsici on agar medium was studied by the opposition culture method using 16 species of bacteria, including cucumber-B_1, which was isolated from the cucumber rotted by P. capsici. Among the 3 agar media used, the bacterial association with P. capsici occurred rapidly at 28-32C and pH 6.6 on oatmeal agar medium, which was favorable for the pathogen. Of the bacteria tested, cucumber-B_1 was associated markedly with the hyphae 24-48 hrs after the opposition culture, as well as was Erwinia carotovora and other several motile bacteria. The associated bacteria, cucumber-B_1, were always found on the surface of the hyphae except at the growing point (or apical area), and the association was better in high concentration agar medium (2%) than in lower (1.0-1.5%). The taxis of bacteria to the hyphae of P. capsici in the bacterial suspension was studied. The taxis of E. carotovora E. aroideae, and cucumber-B_1 occurred remarkably on oatmeal agar medium ; Sarcina lutea showed no taxis on agar medium. Bacterial taxis to the sterilized hyphae and glass fiber was not observed. From this result, it is suggested that the association of bacteria with P. capsici could be established not only by an attachment or adherence by chance but also by an interrelationship between the bacteria and P capsici, that is, the attractive phenomena due to exudation from the hyphae of the pathogen.
日本植物病理学会の論文
1973-12-25

疫病菌と他微生物との相互作用に関する研究 : (3) Phytophthora capsici Leon.の菌糸に対する細菌の随伴現象

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