Korean Journal of Environmental Agriculture (한국환경농학회지)

The Korean Society of Environmental Agriculture (한국환경농학회)
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The Algicidal Activity of Pseudoalteromonas sp. NH-12 against the Toxic Dinoflagellate Alexandrium catenella

유독성 와편모류 Alexandrium catenella에 대한 Pseudoalteromonas sp. NH-12의 살조능

  • Jeoung, Nam-Ho (CU Leaders'College, Catholic University of Daegu) ;
  • Son, Hong-Joo (College of Natural Resources and Life Science, Pusan National University) ;
  • Jeong, Seong-Yun (Department of Biomedical Science, Catholic University of Daegu)
  • 정남호 (대구가톨릭대학교 CU 인재학부) ;
  • 손홍주 (부산대학교 생명자원과학대학) ;
  • 정성윤 (대구가톨릭대학교 의생명과학과)
  • Received : 2012.04.16
  • Accepted : 2012.06.25
  • Published : 2012.06.30
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Abstract

BACKGROUND: The aim of this study was to isolate and identify algicidal bacterium that tends to kill the toxic dinoflagellate Alexandrium catenella, and to determine the algicidal activity. METHODS AND RESULTS: Among of four algicidal bacteria isolated in this study, NH-12 isolate was the strongest algicidal activity against A. catenella. NH-12 isolate was identified on the basis of biochemical characteristics and analysis of 16S rRNA gene sequences. The isolate showed 97.67% homology with Pseudoalteromonas prydzensis ACAM $620^T$ (U85855), and was designated Pseudoalteromonas sp. NH-12. The optimal culture conditions of this isolate were $25^{\circ}C$, initial pH 8.0, and 3.0% (w/v) NaCl concentration. The algicidal activity of NH-12 was significantly increased to maximum value in the late of logarithmic phase of bacterial culture. As a result of 'cell culture insert' experiment, NH-12 is assumed to produce secondary metabolites, as an indirect attacker. When 10% culture filtrate of NH-12 was applied to A. catenella, over 99% of algal cells were destroyed within 24 h. In addition, the killing effects were increased in dose and time dependent manners. CONCLUSION(S): Taken together, our results suggest that Pseudoalteromonas sp. NH-12 could be a candidate for controlling of toxic algal blooms.

우리나라뿐만 아니라 전 세계적으로 적조 및 마비성 패독을 일으켜 문제시되고 있는 유독성 와편모류인 A. catenella 를 살조시키는 해양미생물 Pseudoalteromonas sp. NH-12를 마산만의 적조발생 해역에서 분리, 동정하고 그 특성과 살조능에 대해 연구함으로써 보다 환경 친화적인 적조 구제 기술개발의 기초 자료를 제공하고자 하였다. 적조발생 해역인 마산만의 해수에서 분리한 38개의 해양미생물 균주 중 4종의 미생물이 A. catenella 에 대해 살조능을 나타내었으며, 이중 살조능이 가장 우수한 NH-12 균주를 선별하였다. 본 균주는 API kits 및 16S rRNA gene 염기서열을 분석하여 계통분류를 행한 결과 Pseudoalteromonas 속으로 분류되었으며, 최적 배양조건은 $25^{\circ}C$, pH 8.0, 3.0% NaCl 농도였다. Pseudoalteromonas sp. NH-12의 성장 단계별 살조능은 대수증식기 후기, 정지기, 대수증식기 중기, 유도기 순으로 높게 나타났다. 살조물질은 대수증식기 중기 이후에 활발히 생산되기 시작하여 대수증식기 후기에 가장 고농도로 축적되는 것으로 판단된다. 2조 배양계를 이용한 살조 유형 조사에서 Pseudoalteromonas sp. NH-12는 격리된 상태에서도 A. catenella 를 살조시켜 '직접 공격형'이 아니라 세포외로 물질을 분비하여 살조시키는 '살조인자 분비형'으로 확인되었다. 또한 NH-12 균주 배양여과액을 5% 첨가하였을 때 36시간 후에 A. catenella 는 100% 살조되었고, 10%를 첨가한 경우 24시간 후에 99% 이상 살조되었다.

Keywords

References

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