Korean Journal of Microbiology (미생물학회지)

The Microbiological Society of Korea (한국미생물학회)
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Isolation of marine algicidal bacteria from surface seawater and sediment samples associated with harmful algal blooms in Korea

유해조류번성 주변의 해수와 침전물에서 살조균의 분리

  • Received : 2015.10.01
  • Accepted : 2016.02.05
  • Published : 2016.03.31
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Abstract

This study mainly focused on isolation of marine algicidal bacteria associated with phytoplankton blooms and characterization of algicidal activity against harmful algae. Harmful algal blooms (HABs) found naturally in surface waters have caused many environmental problems worldwide. In this study, forty bacterial strains that have capability of inhibiting harmful algal growth were isolated from Masan Bay, Jinhae Bay, Dol Island, Jangmok Bay, and the Tongyeong Sea, Republic of Korea. The bacteria were screened furthermore for the characteristics on algicidal activities against Cochlodinium polykrikoides, Chattonella marina, Skeletonema costatum, Heterosigma akashiwo, Heterocapsa triquetra, Prorocentrum minimum, and Scrippsiella trochoidea. As a result, the algicidal bacteria that were screened from double over layer agar and microscopic counts tests belonged to genera Pseudomonas, Vibrio, Bacillus, Pseudoalteromonas, Ruegeria, Joostella, Marinomonas, Stakelama, Porphyrobacter, and Albirhodobacter. One of the most important HAB species is Co. polykrikoides and the strongest algicidal activity against the dinoflagellate was 94.00% after 6 h treatment with 10% bacterial culture filtrate. In this study, Marinomonas sp. M Jin 1-8, Stakelama sp. ZB Yeonmyeong 1-11 & 1-13, Porphyrobacter sp. M Yeonmyeong 2-22, and Albirhodobacter sp. 6-R Jin 6-1 were found to be as new genera of bacteria having anti-algal activity. These results suggest that these bacteria might play an important role in controlling phytoplankton blooms.

본 연구는 식물성플랑크톤의 대량증식 조절과 관련된 해양성 살조능이 있는 박테리아의 분리와 유해조류에 대한 분리 균주의 살조능 특성에 주로 초점을 맞추고 있다. 해수 표면에서 자연적으로 발생하는 유해조류번성(HAB)은 전세계적으로 많은 환경문제를 일으키고 있다. 본 연구에서는 유해조류 성장을 억제하는 능력을 가진 40개의 박테리아 균주를 마산만, 진해만, 돌섬, 거제도, 통영 앞바다에서 분리하였다. 분리된 균주들은 다양한 유해조류인 Cochlodinium polykrikoides, Chattonella marina, Skeletonema costatum, Heterosigma akashiwo, Heterocapsa triquetra, Prorocentrum minimum, Scrippsiella trochoidea에 대한 살조특성을 추가로 조사하였다. 살조균주의 선별은 이중층 아가배지와 현미경 계수법을 이용하여 진행하였고 Pseudomonas, Vibrio, Bacillus, Pseudoalteromonas, Ruegeria, Joostella, Marinomonas, Stakelama, Porphyrobacter, Albirhodobacter의 속들에 속하는 균주들이었다. 가장 중요한 유해조류인 Co. polykrikoides에 대한 가장 강력한 살조능은 10% 배양상등액으로 6시간 처리했을 때 94%를 보이는 균주였다. 이 연구를 통해 살조효과를 보이는 새로운 속으로 Marinomonas sp. M Jin 1-8, Stakelama sp. ZB Yeonmyeong 1-11 & 1-13, Porphyrobacter sp. M Yeonmyeong 2-22, Albirhodobacter sp. 6-R Jin 6-1를 새롭게 찾았다. 결론적으로 이들 해양박테리아를 이용하면 식물성플랑크톤 번성을 제어하는데 중요한 역할을 할 것으로 예상된다.

Keywords

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