そ菜頚軟腐病細菌の生態的研究 : 第6報各種植物の生育が導入細菌 Erwiniaaroideae の生存に及ぼす影響

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Seeds of 22 plant species including host plants for Erwinia aroideae were rsed. Immediately after inoculation of E. aroideae to air-dried soil, surface-steri1ized seeds Were sown in this moist soi1, and grown under field conditions. The seeds germinated within a week, and during this period the introduced pathogen predominated in this soil. From thirty-two days after seeding, rhizosphere populations of the growing plants were examined periodica11y by dilution plating and immunofluorescent staining. E. aroideae was recovered from the rhizosphere of only three plants, i. e. chinese cabbage, cucumber and morning-glory, in 3 cases of 52 tested, using the dilution plate method (Table 2). Immuofluorescent staining revealed surviva1 of E. aroideae in the rhizospheres of chinese cabbage, radish, wheat, oat, red bean, tomato, cucumber , sponge-gourd, and morning-g1ory (Table 2 and Plate). On thc contrary E. aroideae was detected consistently in the control soil during the experimental period by dilution plating using modifled Drigalski's medium (Table l). These results suggest that growing plants, including host plant, at least in early stages of growth can not effectively support the growth of E. aroideae and perhaps hasten the death of the pathogen through the intense microbial competition around the roots.
日本植物病理学会の論文
1969-01-25