Abstract
Phylogenetic analysis of the nifH genes, encoding the Fe protein of the nitrogenase enzymatic complex, was carried out for pure cultures of anoxygenic phototrophic bacteria of diverse origin, as well as for heterotrophic alkaliphilic sulfate reducers isolated from saline and soda lakes. Topology of the nitrogenase tree correlated with that of the 16S rRNA gene tree to a considerable degree, which made it possible to use the nifH gene as a molecular marker for investigation of diazotrophic bacterial communities in sediments of hyper saline and soda lakes. Although diazotrophs were revealed in all environmental samples, their phylogenetic diversity was relatively low. Sulfate-reducing deltaproteobacteria and photo- and chemotrophic gammaproteobacteria were predominant in integrated samples. Analysis of the upper sediment layers revealed predominance of phototrophic diazotrophs of various phyla, including purple sulfur and nonsulfur proteobacteria, green nonsulfur bacteria, heliobacteria, and cyanobacteria. Some phylotypes could not be identified, probably indicating the presence of bacterial groups which have not yet been studied by conventional microbiological techniques.
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Original Russian Text © T.P. Tourova, N.V. Slobodova, B.K. Bumazhkin, M.V. Sukhacheva, D.Yu. Sorokin, 2014, published in Mikrobiologiya, 2014, Vol. 83, No. 5, pp. 583–598.
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Tourova, T.P., Slobodova, N.V., Bumazhkin, B.K. et al. Diversity of diazotrophs in the sediments of saline and soda lakes analyzed with the use of the nifH gene as a molecular marker. Microbiology 83, 634–647 (2014). https://doi.org/10.1134/S002626171404016X
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DOI: https://doi.org/10.1134/S002626171404016X