Korean Journal of Microbiology (미생물학회지)

The Microbiological Society of Korea (한국미생물학회)
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Isolation and Optimal Culture Conditions of Brevibacillus sp. KMU-391 against Black Root Pathogens Caused by Didymella bryoniae

덩굴마름병원균인 Didymella bryoniae의 생물학적 방제를 위한 길항세균의 분리 및 특성

  • Published : 2006.06.01
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Abstract

We isolated a bacterium which produces antifungal substances from the Sanktpeterburg soils at Russia. The iso-lated strain was identified as Brevibacillus sp. and shown a strong antifungal activity on plant pathogenic fungi. Brevibacillus sp. KMU-391 produced maximum level of antifungal substances under incubation aerobically at $30^{\circ}C$ for 48 hours in trypticase soybean broth containing 1.0% sucrose and 1.0% polypeptone at 180 rpm and initiated pH adjusted to 7.0. Precipitate of culture broth by $30{\sim}60%$ ammonium sulfate precipitation exhibited strong antifungal activity against Didymella bryoniae by dry cell weight. Butanol extract of cultured broth also shown fungal growth inhibitory activity against Botrytis cinerea KACC 40573, Botrytis fabae KACC 40962, Colletotrichum gloeosporioides KACC 40804, Colletotrichum orbiculare KACC 40808, Didymella bryoniae KACC 40669, Fusarium graminearum KACC 41040, Fusarium oxysporum KACC 40037, Fusarium oxysporum KACC 40052, Fusarium oxysporum f, sp. radicis-Iycopersici KACC 40537, Fusarium oxysporum KACC 40902, Monosporascus cannonballus KACC 40940, Phytophthora camvibora KACC 40160, Rhizoctonia solani AG-1(IA) KACC 40101, Rhizoctonia solani AG-4 KACC 40142, and Scleotinia scleotiorum KACC 41065 by agar diffusion method.

덩굴마름병균인 Didymella bryoniae KACC 40669에 대하여 높은 항진균 활성을 나타내는 Brevibacillus sp. KMU-391은 Russia의 Sanktpeterburg 지역의 토양 시료로부터 분리하였다. Brevibacillus sp. KMU-391이 생산하는 항진균 물질은 D. bryoniae의 생육을 강하게 억제할 수 있었으며 TSB를 기본배지로 하여 탄소원으로 1.0% sucrose와 1.0%의 polypeptone을 첨가한 후 pH를 7.0으로 조정하여 $30^{\circ}C$에서 180 rpm으로 2일간 배양하였을 때 가장 높은 항진균 활성을 나타내었다. 배양액에 $30{\sim}60%$의 ammonium sulfate를 처리하여 Brevibacillus sp. KMU-391이 생산하는 항진균 물질을 회수한 후 D. bryoniae를 액체배양을 통한 항진균 활성을 조사한 결과 대조구와 비교하여 41%의 생육을 저해하는 것으로 확인되었다. 또한 butanol을 이용하여 항잔균 물질을 회수한 후, 다양한 작물병원성 곰팡이를 대상으로 항진균 활성 spectrum을 조사한 결과 조사, 장미 잿빛곰팡이병, 잠두 붉은점무늬병, 고추 탄저병, 참외 탄저병, 수박 등의 박과작물의 덩굴마름병, 보리 질병, 토마토 시들음병, 글라디올러스 마른썩음병, 토마토 질병, 수박 덩굴쪼김병, 수박 질병, 사과나무 역병, 벼 잎집무늬마름병, 참외 줄기썩음병, 그리고 고추균핵병에 대하여 높은 항진균 활성을 나타내었다. 이러한 결과를 바탕으로 Brevibacillus sp. KMU-391을 이용하여 작물병원성 곰팡이에 대한 생물농약으로서의 응용 가능성을 확인 할 수 있었다.

Keywords

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