Diversity and abundance of aerobic and anaerobic ammonium-oxidizing bacteria in freshwater sediments of the Xinyi River (China).
Here we report on the biodiversity and abundance of aerobic and anaerobic ammonium-oxidizing bacteria in sediment samples from the Xinyi River, Jinagsu Province (China). The biodiversity of aerobic ammonium-oxidizing bacteria in the sediment was assessed using the amoA gene as functional marker. The retrieved amoA clones were affiliated to environmental sequences from freshwater habitats. The closest cultivated relative was Nitrosomonas urea. Anaerobic ammonium-oxidizing (anammox) bacteria were studied using anammox and planctomycete-specific 16S rRNA gene primers. The sediments contained 16S rRNA genes and bacterial cells closely related to the known anammox bacterium Candidatus'Brocadia anammoxidans'. Anaerobic continuous flow reactors were set up to enrich anammox organisms from the sediments. After an adaptation period of about 25 days the reactors started to consume ammonium and nitrite, indicating that the anammox reaction was occurring with a rate of 41-58 nmol cm(-3) h(-1). Community analysis of the enrichments by quantitative fluorescence in situ hybridization showed an increase in the abundance of anammox bacteria from < 1% to 6 +/- 2% of the total population. Analysis of the 16S rRNA genes showed that the enriched anammox organisms were related to the Candidatus'Scalindua' genus.
State Key Laboratory of Hydrology-water Resources and Hydraulic Engineering, Xikang Road 1, Nanjing, 210098, China, and Department of Environmental Science and Engineering, Hohai University, Xikang Road 1, Nanjing 210098, China.
Ying
Y
Zhang
Xiao-Hong
XH
Ruan
Huub J M
HJ
Op den Camp
Toine J M
TJ
Smits
Mike S M
MS
Jetten
Markus C
MC
Schmid
D001420:Bacteria, Aerobic / Q000145:classification* / Q000235:genetics / Q000378:metabolism; D001421:Bacteria, Anaerobic / Q000145:classification* / Q000235:genetics / Q000378:metabolism; D044822:Biodiversity; D002681:China; D017753:Ecosystem; D019015:Geologic Sediments / Q000382:microbiology*; D008969:Molecular Sequence Data; D010802:Phylogeny; D000644:Quaternary Ammonium Compounds / Q000378:metabolism*; D012336:RNA, Ribosomal, 16S / Q000145:classification; D045483:Rivers / Q000382:microbiology*
D000644:Quaternary Ammonium Compounds; D012336:RNA, Ribosomal, 16S