한국미생물·생명공학회지 (Microbiology and Biotechnology Letters)

  • 제36권3호
  • /
  • Pages.227-232
  • /
  • 2008
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  • 1598-642X(pISSN)
  • /
  • 2234-7305(eISSN)
한국미생물·생명공학회 (The Korean Society for Microbiology and Biotechnology)
권호 표지

고추역병 유발병원균 Phytophthora capsici에 대한 Bacillus sp. AM-651의 항진균활성

Antifungal Activity of Bacillus sp. AM-651 Against Phytophthora capsici

  • Lee, Jung-Bok ;
  • Shin, Jeong-Hak (School of Bioresource Science, Andong National University) ;
  • Jang, Jong-Ok (Biological Resource Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB)) ;
  • Shin, Kee-Sun (Biological Resource Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB)) ;
  • Choi, Chung-Sik ;
  • Kim, Kun-Woo (School of Bioresource Science, Andong National University) ;
  • Jo, Min-Sub (School of Bioresource Science, Andong National University) ;
  • Jeon, Chun-Pyo (School of Bioresource Science, Andong National University) ;
  • Kim, Yun-Hoi (School of Bioresource Science, Andong National University) ;
  • Kwon, Gi-Seok (School of Bioresource Science, Andong National University)
  • 발행 : 2008.09.28
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초록

고추 역병이 발병된 토양 시료에서 길항미생물을 선발 및 개량하여 다시 현장에 적용했을 때 방제능 및 적응력이 높은 생물 방제균을 선발하고자 총 300여점의 경북 북부지역의 토양시료로부터 길항능이 우수한 균주를 분리하였으며, 이들을 대상으로 고추 역병균에 대한 항진균력이 가장 우수한 균주 AM-651을 최종 선발하였다. 분리균주 AM-651은 생리생화학적 특성과 16S rDNA sequencing의 방법을 이용하여 동정한 결과 Bacillus sp.로 동정되었다. 항진균성 활성물질의 생산을 위한 배지의 최적조건은 Davis minimal media를 변형하여 배양하였을 경우 pH 7, 온도 $30^{\circ}C$ 조건에서 고추 역병균에 대한 항진균 활성이 높았으며, 탄소원으로는 0.5% glucose, 질소원으로는 0.1% $(NH_4)_2SO_4$, 무기염으로는 0.7% $K_2HPO_4$를 첨가하였을 때 가장 높은 활성을 보였다 선발된 Bacillus sp. AM-651 균주를 시간대별로 배양 후 항진균력을 측정 해 본 결과 48시간 배양액에서 고추 역병균에 대한 억제율이 가장 높았다. 또한, Bacillus sp. AM-651의 배양액은 pH와 온도의 변화에서 안정된 활성을 보였다. Bacillus sp. AM-651은 고추 역병 외에도 B. sorokiniana, B. cinerea, R. solani 등에 대하여 항진균 활성이 높았고, 다른 식물성 병원균에 대해서도 비교적 항진균 활성이 높게 나타났다. 열처리한 Bacillus sp. AM-651 배양상등액은 처리전과 비슷한 항진균 활성을 가지므로 열에 안정한 물질인 것으로 추측되었다.

Biological antagonists of Phytophthora capsici were isolated from soil in Gyeongbuk, Korea. Among the isolated bacteria, a Bacillus sp. was identified from l6S rDNA sequence analysis and named Bacillus sp. AM-651. Bacillus sp. AM-65l strain which can strongly a antifungal activity against Phytophthora capsici. Culture conditions for the maximum production of the antagonistic substance were optimized. The production of antibiotic were high on modified Davis mineral medium pH 7 at $30^{\circ}C$. The medium for highest production of the agonistic substance optimized. It is composed the best activity on glucose, $(NH_4)_2SO_4$ and $K_2HPO_4$ at 0.5%, 0.1%, and 0.7%, respectively. By time course of culture solution selected Bacillus sp. AM-65l, the culture solution after 48hrs had strongly growth inhibition rate against P. capsici. And culture solution of Bacillus sp. AM-651 was stable within a pH range $5{\sim}11$ and temperature range $4{\sim}70^{\circ}C$. Bacillus sp. AM-651 cultured broth shown fungal growth inhibitory activity against B. sorokiniana, B. cinerea, R. solani avove and beyond P. capsici and comparatively showed a high activity against C. gloeosporioides, B. dothidea, B. cinerea and F. graminearum by agar diffusion method.

키워드

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