1887

Abstract

Two airborne bacterial isolates, NS/2 and NS/50, were examined in order to determine their taxonomic position. Their almost complete 16S rRNA gene sequences shared 95.9 % similarity. Sequence comparisons demonstrated that their next relatives are species of the genus (93.6–95.7 % similarity) and the strains ‘’ Txc1, ‘’ Txg1 and ‘’ Myx 2105 (90.5–96.4 %). Phylogenetic calculations indicated that these five strains together with the three recognized species form a separate line of descent within the family ‘’. Isolates NS/2 and NS/50, as well as ‘’ Txc1, ‘’ Txg1 and ‘’ Myx 2105, possessed the characteristics of the genus , the quinone system menaquinone MK-7 and a polyamine pattern with the major polyamine being -homospermidine. Each of the five strains had complex, unique polar lipid profiles, with phosphatidylethanolamine and several unknown aminophospho-, amino-, phospho-, glyco- and polar lipids of which several compounds were also found in established species. All the strains studied possessed fatty acids characteristic of species, including major acids iso-C, anteiso-C, C 5, summed feature 3 (C 7/iso-C 2-OH) and summed feature 4 (iso-C I/anteiso-C B). The five strains could be distinguished from each other and from the three established species of the genus based on relatively low 16S rRNA gene sequence similarities (<97 %), unique polar lipids and differing fatty acid profiles and physiological characteristics. In conclusion, the description of four novel species of the genus appears to be justified, for which the names sp. nov. (type strain NS/50=LMG 21876=DSM 15439), sp. nov. (type strain Txc1=LMG 21951=DSM 11115), sp. nov. (type strain Txg1=LMG 21873=DSM 11116) and sp. nov. (type strain Myx 2105=Txo1=LMG 21873=DSM 11117) are proposed. For strain NS/2, a description only is provided without proposal of a name because its status as a novel species was not demonstrated unambiguously.

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2006-09-01
2019-10-20
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