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Abundance and expression of denitrifying genes (narG, nirS, norB, and nosZ) in sediments of wastewater stabilizing constructed wetlands
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  • Journal title : Environmental Engineering Research
  • Volume 20, Issue 1,  2015, pp.51-57
  • Publisher : Korean Society of Environmental Engineering
  • DOI : 10.4491/eer.2014.069
 Title & Authors
Abundance and expression of denitrifying genes (narG, nirS, norB, and nosZ) in sediments of wastewater stabilizing constructed wetlands
Chon, Kyongmi; Cho, Jaeweon;
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As expected, the expression of denitrifying genes in a Typha wetland (relatively stagnant compared to other ponds), showing higher nitrogen removal efficiency in summer, was affected by temperature. The abundance and gene transcripts of nitrate reductase (narG), nitrite reductase (nirS), nitric oxide reductase (norB), and nitrous oxide reductase (nosZ) genes in seasonal sediment samples taken from the Acorus and Typha ponds of free surface flow constructed wetlands were investigated using quantitative polymerase chain reaction (Q-PCR) and quantitative reverse transcription PCR (Q-RT-PCR). Denitrifying gene copy numbers ( genes sediment) were found to be higher than transcript numbers-( transcripts sediment) of the Acorus and Typha ponds, in both seasons. Transcript numbers of the four functional genes were significantly higher for Typha sediments, in the warm than in the cold season, potentially indicating greater bacterial activity, during the relatively warm season than the cold season. In contrast, copy numbers and expression of denitrifying genes of Acorus did not provide a strong correlation between the different seasons.
Constructed wetland;Denitrifying genes;quantitative polymerase chain reaction (Q-PCR);quantitative reverse transcription polymerase chain reaction (Q-RT-PCR);Sediments;
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