Response of bacteria in the deep-sea sediments and the Antarctic soils to carbohydrates: Effects on ectoenzyme activity and bacterial community

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• 作者：Xiang Zeng ; Xiang Xiao ; Fengping Wang
• 关键词：deep-sea sediments ; Antarctic soils ; amending ; cellulose ; chitin ; olive oil ; ectoenzyme activity
• 刊名：Journal of Environmental Sciences
• 出版年：2010
• 出版时间：November 2010
• 年：2010
• 卷：22
• 期：11
• 页码：1779-1785
• 全文大小：284 K

文摘

The response of bacteria to various carbohydrates in the deep-sea sediments and the Antarctic soils was investigated using cellulose, chitin, and olive oil. It was found that the carbohydrates significantly increased the corresponding specific ectoenzyme activity (β-glucosidase, β-N-acetylglucosaminidase, lipase) in the samples from deep-sea sediments. In the case of Antarctic soil samples, the cellulose or olive oil amendments had minor or no effect on β-glucosidase or lipase activity, except the chitin which stimulated β-N-acetylglucosaminidase production. The responses of the bacteria in the deep-sea sediment sample WP02-3 and the Antarctic soil sample CC-TY2 towards the chitin amendment were further analyzed. Chitin amendments were shown to stimulate the ectoenzyme activity in all the tested sediments and the soils. The bacterial response before and after the carbohydrates amendments were compared by denaturing gradient gel electrophoresis and quantitative competitive polymerase chain reaction. Significant changes were found in the structure and density of the bacterial community in the deep sea sediments as compared to the Antarctic soil sample, where the effects were relatively lower. There was no change in the bacterial population in both studied samples in response to carbohydrates amendments. These data indicate that the bacterial communities in the oligotrophic deep-sea sediments are more dynamic than that in the Antarctic soils as they respond to the nutrient sources efficiently by regulation of ectoenzyme activity and/or changing community structure.