적조생물 Cochlodinium polykrikoides를 저해하는 Micrococcus luteus SY-13이 생산하는 살조물질의 특성과 해양생물에 미치는 영향

Characteristics of Algicide Produced by Micrococcus luteus SY-13 Inhibiting Cochlodinium polykrikoides and the Effects on Marine Organisms

  • 김민주 (부산대학교 미생물학과) ;
  • 정성윤 (부산대학교 한국 Bio-IT 파운드리 센터) ;
  • 차미선 (서울대학교 기계항공공학부) ;
  • 이상준 (부산대학교 미생물학과)
  • Kim, Min-Ju (Department of Microbiology, Pusan National University) ;
  • Jeong, Seong-Yun (Korea Bio-IT Foundry Center, Pusan National University) ;
  • Cha, Mi-Sun (School of Mechanical and Aerospace Engineering, Seoul National University) ;
  • Lee, Sang-Joon (Department of Microbiology, Pusan National University)
  • 발행 : 2008.04.30


Algicidal bacterium was isolated from sea water during the declining period of Cochlodinium polykrikoides blooms and this bacterium had a significant algicidal activity against C. polykrikoides. In this study, algicidal bacterium was identified on the basis of biochemical and chemotaxonomic characteristics, and analysis of 16S rDNA sequences. The algicidal bacterium showed 98.6% homology with Micrococcus luteus ATCC $381^T$. Therefore, this bacterium was designated Micrococcus luteus SY-13. The optimal culture conditions of the algicidal bacterium was $25^{\circ}C$, initial pH 8.0, and 3.0% NaCl concentration. M. luteus SY-13 is assumed to produce secondary metabolites which have algicidal activity. When 10% culture filtrate of this strain was applied to C. polykrikoides ($1.0\;{\times}\;10^4\;cells/ml$) cultures, over 98% of C, polykrikoides cells were destroyed within 6 hours. The culture filtrate of M. luteus SY-13 exhibited similar algicidal activity after heat-treatment at $121^{\circ}C$ for 15 min. While algicidal activity remained in filtrates with pH adjusted to 8.0, loss of algicidal activity occurred when the pHs of filtrates were adjusted to over 9.0 or heat-treated at $121{\times}180^{\circ}C$ for 1 hour. M. luteus SY-13 showed significant algicidal activities against C. polykrikoides (98.9%) and a wide algicidal range against various harmful algal bloom (HAB) species. However, there was no algicidal effect on diatom and marine livefood organisms except Isocrysis galbana. These results suggest that M. luteus SY-13 could be a candidate for use in the control of HABs.


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