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Isolation and characterization of algicidal bacteria from Cochlodinium polykrikoides culture

Authors :
Sw Kim Si Wouk Kim
Jy Lee Ji-Young Lee
Mj Kim Min-Ju Kim
Ij Ko In-Jeong Ko
Wonduck Kim
Ji Oh Jeong-Il Oh
Source :
Biotechnology and Bioprocess Engineering. 16:1124-1133
Publication Year :
2011
Publisher :
Springer Science and Business Media LLC, 2011.

Abstract

In this study, we analyzed a bacterial community closely associated with Cochlodinium polykrikoides that caused harmful algal blooming in the sea. Filtration using a plankton mesh and percoll gradient centrifugation were performed to eliminate free-living bacteria. Attached bacteria were analyzed by culture-dependent and culture-independent methods. Five culturable bacterial strains were isolated and identified from the C. polykrikoides mixed bacterial community. The isolates belonged to α-Proteobacteria (Nautella sp., Sagittula sp., and Thalassobius sp.) and γ-Proteobacteria (Alteromonas sp. and Pseudoalteromonas sp.). All of the 5 isolates showed algicidal activity against C. polykrikoides and produced extracellular compounds responsible for algicidal properties after entering the stationary phase. The algicidal compounds produced by the 5 isolates were heat-stable and had molecular masses of less than 10,000 Da. Furthermore, the algicidal compounds were relatively specific for C. polykrikoides in terms of their algicidal activities. Culture-independent analysis of the bacterial community in association with C. polykrikoides was performed using polymerase chain reaction-denaturing gradient gel electrophoresis (PCR-DGGE). On the basis of the PCR-DGGE profile, Sagittula sp. was identified as a dominant species in the bacterial community of C. polykrikoides.

Details

ISSN :
19763816 and 12268372
Volume :
16
Database :
OpenAIRE
Journal :
Biotechnology and Bioprocess Engineering
Accession number :
edsair.doi...........ea97c557e9e715f24d862bae1b7de456