期刊
ANTONIE VAN LEEUWENHOEK INTERNATIONAL JOURNAL OF GENERAL AND MOLECULAR MICROBIOLOGY
卷 108, 期 2, 页码 329-342出版社
SPRINGER
DOI: 10.1007/s10482-015-0485-4
关键词
Ammonia-oxidizing archaea; Ammonia-oxidizing bacteria; Deep-sea sediments; Ammonia monooxygenase alpha-subunit (amoA) gene; Diversity; Abundance
类别
资金
- China Ocean Mineral Resources R&D Association (COMRA) Program [DY125-15-R-01]
- National Key Basic Research Program of China (973-Program) [2015CB755903]
Nitrification, the aerobic oxidation of ammonia to nitrate via nitrite, is performed by nitrifying microbes including ammonia-oxidizing bacteria (AOB) and archaea (AOA). In the current study, the phylogenetic diversity and abundance of AOB and AOA in deep-sea sediments of the Pacific Ocean were investigated using ammonia monooxygenase subunit A (amoA) coding genes as molecular markers. The study uncovered 3 AOB unique operational taxonomic units (OTUs, defined at sequence groups that differ by a parts per thousand currency sign5 %), which indicates lower diversity than AOA (13 OTUs obtained). All AOB amoA gene sequences were phylogenetically related to amoA sequences similar to those found in marine Nitrosospira species, and all AOA amoA gene sequences were affiliated with the marine sediment clade. Quantitative PCR revealed similar archaeal amoA gene abundances [1.68 x 10(5)-1.89 x 10(6) copies/g sediment (wet weight)] among different sites. Bacterial amoA gene abundances ranged from 5.28 x 10(3) to 2.29 x 10(6) copies/g sediment (wet weight). The AOA/AOB amoA gene abundance ratios ranged from 0.012 to 162 and were negatively correlated with total C and C/N ratio. These results suggest that organic loading may be a key factor regulating the relative abundance of AOA and AOB in deep-sea environments of the Pacific Ocean.
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