1887

Abstract

Two strains of thermophilic, anaerobic, chemolithoautotrophic bacteria, designated JR and DR, were isolated from hydrothermal samples collected on the Mid-Atlantic Ridge from the Rainbow (36° 16′ N, 33° 54′ W) and Menez Gwen (37° 50′ N, 31° 50′ W) vent fields, respectively. Cells of both isolates were short, straight- to vibrio-shaped, motile rods with one polar flagellum, and were Gram-negative and non-sporulating. Strain JR was characterized in detail. It was found to grow optimally at pH 6·5–6·7, at 60 °C and in the presence of 30 g NaCl l. Strain JR could use molecular hydrogen, acetate, succinate, pyruvate and proteinaceous compounds as electron donors, and elemental sulfur, nitrate or Fe(III) as electron acceptors. No fermentation of organic substrates occurred. The G+C content of the DNA of strain JR was 30·8 mol%. Strain DR (=DSM 14927) possessed the same morphology and pH, temperature and salinity optima and ranges, and used the same electron acceptors as strain JR. On the basis of their 16S rDNA sequences (1517 nucleotides), strains JR and DR were identical and distantly related to and (95·3 and 95·2 % sequence similarity, respectively). Based on their phenotypic and phylogenetic characteristics, it is proposed that both strains are members of a new species of the genus , for which the name (type strain JR=DSM 14873=JCM 11955) is proposed.

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2003-09-01
2020-01-21
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