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学科主题: Environmental Sciences ; Geosciences, Multidisciplinary
题名: Regulation of bacterial metabolic activity by dissolved organic carbon and viruses
作者: [Xu, Jie] Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou 510301, Guangdong, Peoples R China ; [Xu, Jie ; Jing, Hongmei ; Sun, Mingming ; Harrison, Paul J. ; Liu, Hongbin] Hong Kong Univ Sci & Technol, Div Life Sci, Hong Kong, Hong Kong, Peoples R China
通讯作者: xujie@scsio.ac.cn
关键词: bacterial production ; bacterial respiration ; bacterial growth efficiency ; dissolved organic carbon ; viruses ; coastal waters
刊名: JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
发表日期: 2013
卷: 118, 期:4, 页:1573-1583
部门归属: LTO
资助者: Financial support for this research was provided by the Hundred Talented Program Startup Fund (Y35L041001) by the South China Sea Institute of Oceanology and the University Grants Council of Hong Kong AoE project (AoE/P-04/04-4-II). We thank Candy Lee for helping to count viruses with a flow cytometer.
摘要: The regulation of bacterial metabolic activity by viruses and dissolved organic carbon (DOC) was examined using natural microbial communities in three treatments (active viruses, inactive viruses, and virus free) at two contrasting coastal sites (pristine vs. eutrophic) with substantial differences in environmental conditions during the wet and dry seasons. Our results showed that net growth rates and production of bacterioplankton were reduced primarily by viruses via repressing metabolically active bacteria with high nucleic acid (HNA) content which had a high capacity for incorporating carbon, while bacterial respiration was primarily regulated by DOC lability. The quality of organic matter played a more important role in regulating bacterial growth efficiency (BGE) than the supply of organic matter in eutrophic coastal waters. The lack of HMW-DOC and high carbon demand in the virus-free treatment resulted in a significant increase in cell-specific bacterial respiration, which was responsible for the lowest bacterial growth efficiency among the three treatments. The presence of viruses did not necessarily lower bacterial growth efficiency since virus-induced mortality alleviated bacterial carbon demand and enhanced carbon cycling. Virus-induced mortality was greater in relatively pristine waters than eutrophic waters, likely since the high supply of substrates alleviated the pressure of viral infection, through extracellular proteases produced by bacteria, which might result in the hydrolytic destruction or modification of viral capsids. An important implication of our results was that the input of riverine DOC and nutrients improved bacterial metabolic activity by alleviating virus-induced mortality of bacteria in estuarine and coastal waters.
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000329871400019
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/10864
Appears in Collections:热带海洋环境国家重点实验室(LTO)_期刊论文

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[Xu, Jie] Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou 510301, Guangdong, Peoples R China; [Xu, Jie; Jing, Hongmei; Sun, Mingming; Harrison, Paul J.; Liu, Hongbin] Hong Kong Univ Sci & Technol, Div Life Sci, Hong Kong, Hong Kong, Peoples R China.Regulation of bacterial metabolic activity by dissolved organic carbon and viruses,JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,2013,118(4):1573-1583
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