Journal of Life Science (생명과학회지)

Korean Society of Life Science (한국생명과학회)
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Isolation and Antifungar Activity of Bacillus ehimensis YJ-37 as Antagonistic against Vegetables Damping-off Fungi

채소류 모잘록병균에 길항하는 Bacillus ehimensis YJ-37의 선발과 항진균성

  • Published : 2002.04.01
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Abstract

This study was carried out to isolate of antagonistic bacterium against Pythium ultimum and Rhizoctonia solani AG-4, causal pathogens of vegetables damping-off. Total of 600 strains were isolated from soil and plait roots. The isolates were screened for antagonism against Pythium ultimum and Rhizoctonia solani AG-4. One strain, named YJ-37, was sellected for detained study among those microoganisms screened. It was identified as Bacillus ehimensis based on morphological and physiological characterisitics according to the Bergey's mannual of systematic bacteriology, Sherlock system of Microbial ID Inc. and 16S rDNA sequences methods. Furthermore Bacillus ehimensis YJ-37 showed antifungal activities against Alternaria altrata, Collectotrichum gloeosporioides, Didymella bryoniae, Fusarium moniliforme, Fusarium oxysporum, F. oxysporum cucumerinum, F. oxysporum niveum, Gloeosporium sp., Glomerella sp., G. cingulata, G. lagenaria, Penicillium digitatum, P. italicum, Phytophthora capsici, Sclerotinia sclerotiorum, and Stemprhylium solani.

채소류 모잘록병균인 Pythium ultimun에 길항하는 미생물을 분리하기 위해 체소류 뿌리를 균원시료로 하여 약600여종의 근권미생물을 분리하였고, 그중 5종의 근권미생물이 길항력을 나타내어 가장 높은 길항력 높은 Yl-37 균주를 최종 선별하였다. 분리한 길항균 YJ-37을 Bergey's Mannual of Systematic Bacteriology의 방법에 준하여 미생물의 형태학적, 배양학적, 생리·생화학적 특성을 조사 하였으며, 미생물의 세포벽의 지방산의 조성으로 자동 동정하는 Sherlock system을 이용하는 방법과 16S rDNA의 부분염기서열을 결정하여 동정하는 방법 등 3가지 방법으로 조사한 결과, 근권 길항미생물인 YJ-37 균주는 Bacillus ehimensis로 동정되었다. 채소류 모잘록병균 Pythium ultimun과 Rhizoctonia solani AG-4 이외에도 B. ehimensis YJ-37에 의한 병원성 진균의 길항력을 조사한 결과, Alternaria altrata, Collectotrichum gloeosporioides, Didymella bryoniae, Fu-sarium moniliforme, F oxysporum, F. oxysporum cucumerinum, F. oxysporum niveum, Gloeosporium sp., Glomerella sp., G. cingulata, G. lagenaria, Penicillium digitatum, P. itazicum, Phytophthora capsici, Sclerotinia sclerotiorum, Stemprhyzium solani등 대부분의 병원균에 대해서 항진균 활성을 나타내었다.

Keywords

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