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http://dx.doi.org/10.5338/KJEA.2012.31.2.175

The Algicidal Activity of Pseudoalteromonas sp. NH-12 against the Toxic Dinoflagellate Alexandrium catenella  

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)
Publication Information
Korean Journal of Environmental Agriculture / v.31, no.2, 2012 , pp. 175-184 More about this Journal
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.
Keywords
Alexandrium catenella; Algicidal activity; Pseudoalteromonas; Red tide;
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