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イオンビームで改良された植物内生細菌の性質

Characteristics of mutant endophytic bacteria strains improved using ion beams

相野 公孝*; 松浦 克成*; 佐藤 勝也; 鳴海 一成

Aino, Masataka*; Matsuura, Katsunari*; Sato, Katsuya; Narumi, Issei

The endophytic bacteria produce various kinds of bioactive substances, by which the plants grow well and exhibit resistance to diseases and environmental stress. We could successfully obtain mutants that have enhanced suppressiveness against the tomato bacterial wilt by ion-beam irradiation to ${it Pseudomonas fluorescens}$ FPH 9601. In this study, we investigated antagonistic effect, production of antagonistic substance against tomato bacterial wilt and survival inside tomato seedling roots of the mutants. The ability to colonize inside tomato seedling roots of the mutants was not different from that of the parental strain. On the other hand, the ability to produce antagonistic substance from the colonized roots was varied. However, relationship between the production of antagonistic substance and suppression effect of tomato bacterial wilt was not ascertained.

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