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Bacillus aurantiacus sp. nov., an alkaliphilic and moderately halophilic bacterium isolated from Hungarian soda lakes

¹ Department of Microbiology, Eötvös Loránd University, Pázmány P. sétány 1/C, H-1117 Budapest, Hungary
² Department of Anatomy, Cell and Developmental Biology, Eötvös Loránd University, Pázmány P. sétány 1/C, H-1117 Budapest, Hungary
³ DSMZ – Deutsche Sammlung von Mikroorganismen und Zellkulturen GmbH, Inhoffenstr. 7b, D-38124 Braunschweig, Germany

Correspondence
Andrea K. Borsodi
bandrea{at}ludens.elte.hu

Three alkaliphilic and moderately halophilic strains designated K1-5^T, K1-10 and B1-1, characterized by optimal growth at pH 9.0–10.0 and at 3–7 % (w/v) NaCl, were isolated from extremely shallow, alkaline soda lakes located in Hungary. Cells of the strains are Gram-positive, straight rods and form a central to subterminal, ellipsoidal endospore. The isolates are strictly aerobic, catalase-positive, oxidase-negative and contain a peptidoglycan of type A1 based on meso-diaminopimelic acid. In strain K1-5^T, menaquinone-7 (MK-7) is the predominant isoprenoid quinone and anteiso-C_{15 : 0} is the major cellular fatty acid. The DNA G+C content of strain K1-5^T is 42.9 mol%. 16S rRNA gene-based phylogenetic analysis revealed that the strains exhibit levels of sequence similarity of less than 95.8 % to known Bacillus species. According to the polyphasic characterization, the strains represent a novel species, for which the name Bacillus aurantiacus sp. nov. is proposed. The type strain is K1-5^T (=DSM 18675^T =CCM 7447^T =NCAIM B002265^T).

Detailed Biolog GP2 test results for the novel strains are available as supplementary material with the online version of this paper.

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