한국미생물·생명공학회지 (Microbiology and Biotechnology Letters)

  • 제35권2호
  • /
  • Pages.128-134
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  • 2007
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  • 1598-642X(pISSN)
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  • 2234-7305(eISSN)
한국미생물·생명공학회 (The Korean Society for Microbiology and Biotechnology)
권호 표지

다기능 PGPR균주 Bacillus licheniformis K11이 생산하는 항진균성 Siderophore의 정제와 특성

Purification and Characterization of the Siderophore from Bacillus licheniformis K11, a Multi-functional Plant Growth Promoting Rhizobacterium.

  • 우상민 (영남대학교 응용미생물학과) ;
  • 우재욱 (영남대학교 응용미생물학과) ;
  • 김상달 (영남대학교 응용미생물학과)
  • Woo, Sang-Min (Department of Applied Microbiology, Yeungnam University) ;
  • Woo, Jae-Uk (Department of Applied Microbiology, Yeungnam University) ;
  • Kim, Sang-Dal (Department of Applied Microbiology, Yeungnam University)
  • 발행 : 2007.06.28
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초록

식물성장촉진 호르몬인 auxin, 식물병원성 진균의 생육을 억제하는 siderophore, 그리고 세포벽이 cellulose로 구성된 식물병원성 진균의 세포벽을 분해하는 cellulase를 동시에 생산하는 PGPR균주이자 생물방제균주로 선발된 Bacillus licheniformis K11이 생산하는 항진균성 siderophor의 특성을 확인한 결과 catechol type의 siderophore로 확인하였다. 또한 B. licheniformis K11의 siderophore 생산조건을 조사한 결과 nutrient broth(pH 9.0)를 $20^{\circ}C$에서 96 h 배양시 가장 많이 생산하였다. 그리고 탄소원과 질소원으로는 각각 trehalose와 $NH_4Cl$ 첨가시 siderophore를 가장 많이 생산하였다. 그리고 $siderophore_{K11}$의 정제는 Amberlite XAD-2과 sephadex LH-20 column chromatography를 통해 수행하였으며, HPLC를 통해 단일 물질임을 확인하였다. 정제된 $siderophore_{K11}$은 2, 3-dihydroxybenzoate의 유도체로 추정하며, P. capsici의 zoospores와 F. oxysporum의 conidia의 발아를 강하게 억제하였다.

Previously, we isolated plant growth promoting rhizobacterium (PGPR) Bacillus licheniformis K11 which could produce auxin, cellulase and siderophore. The siderophore of B. licheniformis K11 $(siderophore_{K11})$ was determined to be a catechol type siderophore which is produced generally by Bacillus spp. B. licheniformis K11 could produce the siderophore most highly after 96 h of incubation under nutrient broth at $20^{\circ}C$ with initial pH 9.0. For the production of the $siderophore_{K11}$, trehalose and $NH_4Cl$ were the best carbon and nitrogen sources in Davis minimal medium, respectively. The $siderophore_{K11}$ was Produced in M9 medium (pH 9.0) after 4 days at $20^{\circ}C$, and purified from culture broth of B. licheniformis K11 by using Amberlite XAD-2, Sephadex LH-20 column chromatography, and reversed-phase HPLC. The $siderophore_{K11}$ had the biocontrol activity against spore germination of P. capsici and F. oxysporum on potato dextrose agar (PDA). The results indicate that the $siderophore_{K11}$ is an antifungal mechanism of B. licheniformis K11 against phytopathogenic fungi.

키워드

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