Abstract
In the context of studying the influence of N-fertilization on N2 and N2O flux rates in relation to the soil bacterial community composition in fen peat grassland, a group of bacterial strains was isolated that performed dissimilatory nitrate reduction to ammonium and concomitantly produced N2O. The amount of nitrous oxide produced was influenced by the C/N ratio of the medium. The potential to generate nitrous oxide was increased by higher availability of nitrate-N. Phylogenetic analysis based on the 16S rRNA and the rpoB gene sequences demonstrated that the investigated isolates belong to the genus Proteus, showing high similarity with the respective type strains of Proteus vulgaris and Proteus penneri. DNA–DNA hybridization studies revealed differences at the species level. These differences were substantiated by MALDI-TOF MS analysis and several distinct physiological characteristics. On the basis of these results, it was concluded that the soil isolates represent a novel species for which the name Proteus terrae sp. nov. (type strain N5/687T =DSM 29910T =LMG 28659T) is proposed.
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Acknowledgments
We wish to thank Mrs. B. Selch, Mrs. S. Weinert, Mr. B. Gusovius (ZALF-Müncheberg), Mrs. A. Wasner, Mrs. B. Sträubler and Mrs. G. Pötter (DSMZ-Braunschweig), and Mr. Th. Rossoll (IGB-Berlin) for their excellent technical assistance.
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The EMBL accession number for the 16S rRNA gene sequences of the type strain Proteus terrae N5/687T (DSM 29910T = LMG 28659T) and Proteus penneri DSM 4544T are LN680103 and LN809884, respectively. The rpoB gene sequences of Proteus terrae N5/687T and Proteus hauseri DSM 14437T are LN809885 and LN809886, respectively
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Fig. S1
Neighbour joining tree of the 16S rRNA gene showing the relationships between strain N5/687T and type strains of the species of the genus Proteus and related genera. Filled circles indicate branches of the tree that were also obtained using the maximum likelihood method. The sequence of Yersinia kristensenii ATCC 33638T (GenBank accession no. AF366381) was used as an outgroup (not shown). Numbers at the nodes indicate bootstrap support of more than 70 % (based on 1000 resampled datasets). Bar 0.01 changes per nucleotide position. Supplementary material 1 (EPS 890 kb)
Fig. S2
Neighbour joining tree of the rpoB gene showing the relationships between strain N5/687T and type strains of the species of the genus Proteus and related genera. Filled circles indicate branches of the tree that were also obtained using the maximum likelihood method. The sequence of Yersinia kristensenii CCUG 11294T (GenBank accession no. EF1755969) was used as an outgroup (not shown). Numbers at the nodes indicate bootstrap support of more than 70 % (based on 1000 resampled datasets). Bar 0.01 changes per nucleotide position. Supplementary material 2 (EPS 769 kb)
Fig. S3
Consensus tree showing the molecular evolutionary relationships of the 16S rRNA and rpoB genes. The sequences of Yersinia kristensenii ATCC 33638T (GenBank accession no. AF366381 and EF1755969) was used as an outgroup (not shown). Bar, 0.01 changes per nucleotide position. Supplementary material 3 (EPS 822 kb)
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Behrendt, U., Augustin, J., Spröer, C. et al. Taxonomic characterisation of Proteus terrae sp. nov., a N2O-producing, nitrate-ammonifying soil bacterium. Antonie van Leeuwenhoek 108, 1457–1468 (2015). https://doi.org/10.1007/s10482-015-0601-5
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DOI: https://doi.org/10.1007/s10482-015-0601-5