1887

Abstract

A high-G+C-content Gram-positive bacterium, designated as strain AC4r, was isolated from a highly alkaline, non-saline groundwater environment (pH 11.4). This organism formed small rod-shaped cells, was aerobic, heterotrophic, catalase-positive and oxidase-negative and had an optimum growth temperature of 35 °C and an optimum pH of 9.5. The strain possessed a B2-type cell-wall peptidoglycan, with -Orn as the diagnostic diamino acid. The major respiratory quinones were unsaturated menaquinones with 13 and 14 isoprene units. The predominant fatty acids were anteiso-15 : 0, iso-16 : 0, iso-14 : 0 and iso-15 : 0. The G+C content of the DNA was 67.1 mol%. In a 16S rRNA gene sequence analysis, strain AC4r showed the highest level of similarity (99.2 %) to the type strain of ; however, the DNA–DNA reassociation value between these two organisms was low (38.3 %). On the basis of phylogenetic analysis, the DNA–DNA reassociation value and distinct phenotypic characteristics, strain AC4r represents a novel species within the genus , for which the name sp. nov. is proposed. The type strain is AC4r (=LMG 22690=CIP 108473).

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2006-10-01
2021-04-20
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