Nitrification of archaeal ammonia oxidizers in acid soils is supported by hydrolysis of urea
文献类型: 外文期刊
第一作者: Lu, Lu
作者: Lu, Lu;Wu, Yucheng;Wang, Baozhan;Lin, Xiangui;Zhu, Jianguo;Jia, Zhongjun;Lu, Lu;Han, Wenyan;Zhang, Jinbo;Cai, Zucong
作者机构:
关键词: 15N pool enrichment;Acid soil;Archaeal ammonia oxidation;Pyrosequencing;Urea hydrolysis
期刊名称:ISME JOURNAL ( 影响因子:10.302; 五年影响因子:12.284 )
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年卷期:
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收录情况: SCI
摘要: The hydrolysis of urea as a source of ammonia has been proposed as a mechanism for the nitrification of ammonia-oxidizing bacteria (AOB) in acidic soil. The growth of Nitrososphaera viennensis on urea suggests that the ureolysis of ammonia-oxidizing archaea (AOA) might occur in natural environments. In this study, 15 N isotope tracing indicates that ammonia oxidation occurred upon the addition of urea at a concentration similar to the in situ ammonium content of tea orchard soil (pH 3.75) and forest soil (pH 5.4) and was inhibited by acetylene. Nitrification activity was significantly stimulated by urea fertilization and coupled well with abundance changes in archaeal amoA genes in acidic soils. Pyrosequencing of 16S rRNA genes at whole microbial community level demonstrates the active growth of AOA in urea-amended soils. Molecular fingerprinting further shows that changes in denaturing gradient gel electrophoresis fingerprint patterns of archaeal amoA genes are paralleled by nitrification activity changes. However, bacterial amoA and 16S rRNA genes of AOB were not detected. The results strongly suggest that archaeal ammonia oxidation is supported by hydrolysis of urea and that AOA, from the marine Group 1.1a-associated lineage, dominate nitrification in two acidic soils tested.
分类号: Q93
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