High Oxygen Concentration Increases the Abundance and Activity of Bacterial Rather than Archaeal Nitrifiers in Rice Field Soil
文献类型: 外文期刊
第一作者: Ke, Xiubin
作者: Ke, Xiubin;Lu, Wei;Ke, Xiubin;Conrad, Ralf
作者机构:
关键词: Nitrification rate;Ammonia-oxidizing bacteria;Ammonium-oxidizing archaea;Nitrite-oxidizing bacteria;Ammonia monooxygenase;Nitrospira;Nitrobacter;Transcription;T-RFLP;qPCR
期刊名称:MICROBIAL ECOLOGY ( 影响因子:4.552; 五年影响因子:4.77 )
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年卷期:
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收录情况: SCI
摘要: Oxygen is considered as a limiting factor for nitrification in rice paddy soil. However, little is known about how the nitrifying microbial community responds to different oxygen concentrations at community and transcript level. In this study, soil and roots were harvested from 50-day-old rice microcosms and were incubated for up to 45 days under two oxygen concentrations: 2 % O-2 and 20 % O-2 (ambient air). Nitrification rates were measured from the accumulation of nitrite plus nitrate. The population dynamics of bacterial (AOB) and archaeal (AOA) ammonia oxidizers was determined from the abundance (using quantitative PCR (qPCR)) and composition (using terminal restriction fragment length polymorphism and cloning/sequencing) of their amoA genes, that of nitrite oxidizers (NOB) by quantifying the nxrA gene of Nitrobacter spp. and the 16S rRNA gene of Nitrospira spp. The activity of the nitrifiers was determined by quantifying the copy numbers of amoA and nxrA transcripts (using RT-qPCR). Different oxygen concentrations did not affect the community compositions of AOB, AOA, and NOB, which however were different between surface soil, bottom soil, and rice roots. However, nitrification rates were higher under ambient air than 2 % O-2, and abundance and transcript activities of AOB, but not of AOA, were also higher. Abundance and transcript copy numbers of Nitrobacter were also higher at ambient air. These results indicate that AOB and NOB, but not AOA, were sensitive to oxygen availability.
分类号: Q938
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