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Composition of denitrifying bacterial enzyme genes nirS, nirK and nosZ in constructed wetlands
Department of Chemical Ecology/Ecotoxicology, Lund University, Lund, Sweden.
Department of Chemical Ecology/Ecotoxicology, Lund University, Lund, Sweden.
Halmstad University, School of Business and Engineering (SET), Biological and Environmental Systems (BLESS), Wetland Research Centre.
Swedish County Administrative Board, Länsstyrelsen Kalmar län, Kalmar, Sweden.
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Abstract [en]

In this study the composition of the denitrifying bacterial community among constructed wetlands in agricultural areas was investigated. Thirty-two constructed wetlands located in Southern Sweden were surveyed, and biofilm samples from each were analyzed by applying denaturing gradient gel electrophoresis, to investigate the community composition of the three denitrifying bacterial enzyme genes nirK, nirS and nosZ. The DNA sequences of the enzyme genes were compared to known DNA sequences in GeneBank using BLAST. The results of the denitrifying bacterial enzyme genes indicated that these habitats may harbour a heterogeneous denitrifying bacterial community. Individual analysis of the enzyme genes revealed that nirS was more heterogeneous than both nirK and nosZ. Most sequences from the present study clustered with known sequences from species belonging to the group of α-Proteobacteria, and to a lesser extent with β- Proteobacteria and γ-Proteobacteria, and only nirS clustered with a member of gram-positive bacteria.

Keyword [en]
denitrification, phylogenetic tree, PCR-DGGE, sequencing
National Category
Natural Sciences
URN: urn:nbn:se:hh:diva-21481OAI: diva2:605282

Included in doctoral thesis: Milenkovski, Susann. Structure and Function of Microbial Communities in Constructed Wetlands - Influence of environmental parameters and pesticides on denitrifying bacteria. Lund University 2009.

Available from: 2013-02-13 Created: 2013-02-13 Last updated: 2013-11-15Bibliographically approved

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Thiere, GeraldineWeisner, Stefan
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