1887

Abstract

Alkaliphilic strains characterized by optimal growth at pH 9.0 and 5 % (w/v) NaCl designated K1-25 and H3-93 were isolated from extremely shallow soda ponds located in Hungary. Cells of both strains were Gram-stain-positive, non-motile, straight rods and formed central, ellipsoidal endospores with swollen sporangia. The isolates were aerobic, catalase-positive, oxidase-negative and contained a peptidoglycan of type A1γ based on -diaminopimelic acid. In both strains, menaquinone-7 (MK-7) was the predominant isoprenoid quinone and the major cellular fatty acids were anteiso-C and iso-C. The DNA G+C contents of strains K1-25 and H3-93 were 39.0 and 36.3 mol%, respectively. 16S rRNA gene sequence-based phylogenetic analysis revealed 99.2 % similarity between strains K1-25 and H3-93 and the novel isolates had the highest similarities to 1139 (97.8 and 98.3 %, respectively), N-1 (97.0 and 97.4 %), Kh10-101 (97.1 and 97.4 %) and AM31D (96.9 and 97.1 %). DNA–DNA hybridization between our strains and the type strains of closely related species was lower than 70 %. Although DNA–DNA hybridization between strains K1-25 and H3-93 was 27 %, the phenotypic and chemotaxonomic data did not support the differentiation of these two strains into separate species. Therefore, they represent genomovars of a novel species, for which the name sp. nov. is proposed. The type strain is K1-25 ( = DSM 21670  = NCAIM B02301).

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2011-08-01
2019-10-21
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vol. , part 8, pp. 1880 - 1886

16S rRNA gene sequence-based phylogenetic relationships of sp. nov. strains K1-25 and H3-93 and closely related species, reconstructed using the maximum-likelihood (Fig. S1) and least-squares (Fig. S2) algorithms.

RiboPrint patterns of strains of sp. nov. and closely related type strains.

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