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KMID : 0545120000100060811
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Journal of Microbiology and Biotechnology
2000 Volume.10 No. 6 p.811 ~ p.816
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Isolation of Bacterial Strain Antagonistic to Pyricularia oryzae and Its Mode of Antifungal Action
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Bae, Dong Won
Lee, Joon Taek/Son, Dae Young/Lee, Eun Sook/Kim, Hee Kyu
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Abstract
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An antagonistic bacterium PM-1 which strongly inhibits the growth of Pyricularia oryzae was isolated and identified as Paenibacillus macerans. The antifungal substances of the strain PM-1 showed the broad antifungal spectra against P. oryzae races. Relating to the localization test, it was found that the antifungal substances existed not only in the cytoplasm but also in the culture supernatant, and importantly the antifungal activity of the latter was stronger than that of the former. The extracellular antifungal substances were extremely heat-stable up to 121℃ for 15min. The substances were optimally produced at 20℃ and pH 10.0 in a potato dextrose broth. The culture filtrate of the strain PM-1 caused a partial swelling of the mycelia of P. oryzae, and it prevents the normal growth of the fungus as well. This result suggested that the antifungal substances secreted by the strain PM-1 potentially inhibited the germination of P. oryzae.
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