期刊
MARINE DRUGS
卷 9, 期 2, 页码 184-195出版社
MDPI
DOI: 10.3390/md9020184
关键词
psychrophilic; heterotrophic bacteria; diversity; cold-active enzymes; Antarctica
资金
- Ocean Public Welfare Scientific Research Project of China [201005032-4]
- National Key Technology R&D Program of China [2006BAB18B07]
- National Natural Science Foundation of China [30500001]
The diversity and cold-active hydrolytic enzymes of culturable bacteria associated with sandy sediment from Nella Fjord, Eastern Antarctica (69 degrees 22'6 '' S, 76 degrees 21'45 '' E) was investigated. A total of 33 aerobic heterotrophic bacterial strains were isolated at 4 degrees C. These bacterial isolates could be sorted into 18 phylotypes based on the 16S rRNA gene sequence belonging to four phyla, namely Alphaproteobacteria, Gammaproteobacteria, Bacteroidetes and Actinobacteria. Only seven isolates were psychrophilic, 15 isolates were moderately psychrophilic, and 11 isolates were psychrotolerant. More than 72% of the isolates required sodium chloride to grow. Esterase, beta-glucosidase and proteases activities at 4 degrees C were detected in more than 45% of the strains while approximately 21%, 15% and 12% of the strains possessed lipase, amylase and chitinase, respectively. These results indicate that a relatively high culturable bacterial diversity is present within marine sediment of Nella Fjord and it could serve as an ideal candidate region for bioprospecting.
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