Antibacterial Activity of Onion Pathogens and Isolation of Bacillus ehimensis YJ-4 from the Rhizosphere of Healthy Onion Roots

건전 양파 근권으로부터 Bacillus ehimensis YJ-4의 분리 및 양파 병원균들에 대한 길항력 조사

  • Published : 2003.06.01

Abstract

This study was carried out to isolate of antagonistic bacterium to Allium cepa L. pathogens. A total of 250 strains were isolated from A. cepa L. roots. The isolates were screened for antagonism to A. cepa L. pathogens and the isolated strain No. YJ-4 was selected among these bacteria. It was identified as Bacillus ehimensis based on morphological and physiological characteristics according to the Bergey's mannual of systematic bacteriology, Sherlock system of Microbial ID Int and 165 rDNA sequences methods. Bacillus ehimensis YJ-4 showed broad spectrum of antibacterial and antifungal activities against plant pathogens as Alternaria porri, Botrytis cinerea, Erwinia carotovora subsp. carotovora Fusarium of oxysporium, penicillium sp., Pseudomonas sp., Rhizoctonia solani, Sclerotium cepivotum, Septoria sp., Stemphylium botryosum. Speially B. ehimensis YJ-4 showed high antifungal activity on growth against F. oxysporium, the causal agent of onion Fusarium wilt.

양파 근권미생물은 양파 뿌리를 균원시료로 하여 약 250여종의 근권미생물을 순수 분리하였고 이들 중에서 길항미생물은 무름병균인 Erwinia carotovora subsp. carotovora와 시들음병균인 Fuarium oxysporium에 각각 서로 대치 배양하여 두 병원균 모두에 가장 강한 길항 효과를 나타내는 YJ-4 균주를 최종 선발하였다. 선발균주 YJ-4는 Bergey's mannual of systematic bacteriology 방법에 따라 조사하여 Bacillus 속으로 판정하였고, 세포벽 지방산을 분석하여 동정하는 Sherlock system에 의해 Bacillus ehimensis와 0.778의 유의성을 확인하였으며, 165 rDNA의 부분 염기서열(609bp)로 Bacillus ehimensis와 98.36%의 높은 유사도를 보여 길항균 YJ-4는 Bacillus ehimensis로 동정하였다. B. ehimensis YJ-4로 명명한길항균은 세균인 무름병균 (Erwinia carotovora subsp. carotovora)과 세균썩음병균 (Pseudomonas sp.)에도 길항력을 나타내었고, 진균인 잘록병균 (Rhizoctonia solani), 잎마름병균 (Stemphylium botryosum), 검은무의병균 (Alternaria porri), 검은점잎마름병균 (Septoria sp.), 잿빛곰팡이병균 (Botrytis cinerea), 흑색썩음균핵병균 (Sclerotium cepivotum), 시들음병균 (Fusarium oxysporium), 푸른곰팡이병균 (Penicillium sp.)등에도 길항 효과를 나타내었다. 특히 시들음병균인 F. oxysporium에 생육억제환의 길이가 24.8mm로 가장 높은 길항력을 나타내었다.

Keywords

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