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http://dx.doi.org/10.7845/kjm.2014.4014

Diversity and Physiological Characteristics of Culturable Bacteria from Marine Sediments of Ross Sea, Antarctica  

Lee, Yung Mi (Division of Polar Life Sciences, Korea Polar Research Institute)
Jung, You-Jung (Division of Polar Life Sciences, Korea Polar Research Institute)
Hong, Soon Gyu (Division of Polar Life Sciences, Korea Polar Research Institute)
Kim, Ji Hee (Division of Polar Life Sciences, Korea Polar Research Institute)
Lee, Hong Kum (Division of Polar Life Sciences, Korea Polar Research Institute)
Publication Information
Korean Journal of Microbiology / v.50, no.2, 2014 , pp. 119-127 More about this Journal
Abstract
The affiliations and physiological characteristics of culturable bacteria isolated from the sediments of Ross Sea, Antarctica were investigated. Sixty-three isolates obtained by cultivation were grouped into 21 phylotypes affiliated with the phyla Actinobacteria and Bacteroidetes and with the classes Alphaproteobacteria and Gammaproteobacteria by phylogenetic analysis of 16S rRNA gene sequences. Based on phylogenetic analysis (<98.65% sequence similarity), approximately 49% of total isolates represented potentially novel species or genus. Among them, extracellular protease, lipase, and exopolysaccharide activities at $10^{\circ}C$ or $20^{\circ}C$ were detected in approximately 46%, 25%, and 32% of the strains, respectively. Forty-three isolates produced at least one type of extracellular material and 21 of them produced at least two extracellular protease, lipase, and/or exopolysaccharides. Our findings indicate that culturable bacterial diversity present within the marine sediments of Ross Sea, Antarctica may contribute to the hydrolysis of the major organic constituents which is closely related with carbon and nitrogen cycling in this environment.
Keywords
cold-active enzymes; cultivation; exopolysaccharides; marine sediments;
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