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- W2160517962 abstract "ABSTRACT Isolated soil DNA from an oak-hornbeam forest close to Cologne, Germany, was suitable for PCR amplification of gene segments coding for the 16S rRNA and nitrogenase reductase (NifH), nitrous oxide reductase (NosZ), cytochrome cd 1 -containing nitrite reductase (NirS), and Cu-containing nitrite reductase (NirK) of denitrification. For each gene segment, diverse PCR products were characterized by cloning and sequencing. None of the 16S rRNA gene sequences was identical to any deposited in the data banks, and therefore each of them belonged to a noncharacterized bacterium. In contrast, the analyzed clones of nifH gave only a few different sequences, which occurred many times, indicating a low level of species richness in the N 2 -fixing bacterial population in this soil. Identical nifH sequences were also detected in PCR amplification products of DNA of a soil approximately 600 km distant from the Cologne area. Whereas biodiversity was high in the case of nosZ , only a few different sequences were obtained with nirK . With respect to nirS , cloning and sequencing of the PCR products revealed that many false gene segments had been amplified with DNA from soil but not from cultured bacteria. With the 16S rRNA gene data, many sequences of uncultured bacteria belonging to the Acidobacterium phylum and actinomycetes showed up in the PCR products when isolated DNA was used as the template, whereas sequences obtained for nifH and for the denitrification genes were closely related to those of the proteobacteria. Although in such an experimental approach one has to cope with the enormous biodiversity in soils and only a few PCR products can be selected at random, the data suggest that denitrification and N 2 fixation are not genetic traits of most of the uncultured bacteria." @default.
- W2160517962 created "2016-06-24" @default.
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- W2160517962 date "2002-08-01" @default.
- W2160517962 modified "2023-10-17" @default.
- W2160517962 title "Biodiversity of Denitrifying and Dinitrogen-Fixing Bacteria in an Acid Forest Soil" @default.
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- W2160517962 doi "https://doi.org/10.1128/aem.68.8.3818-3829.2002" @default.
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