1887

Abstract

A novel thermophilic, acidophilic bacterium, designated strain Pd55, was isolated from a self-temperature-recording colonization system deployed in a hydrothermal diffusing flow (maximum temperature of 78 °C) at the TOTO caldera in the Mariana Arc. Cells of strain Pd55 were motile, short rods with a single polar flagellum. Growth was observed between 30 and 68 °C (optimum growth at 50 °C; 120 min doubling time) and between (initial) pH 4·2 and 7·0 (optimum at pH 5·2). The isolate was a strictly anaerobic chemolithoautotroph capable of using molecular hydrogen as sole energy source and carbon dioxide as sole carbon source. Elemental sulfur served as the sole electron acceptor to support growth. The G+C content of the genomic DNA was 34·0 mol%. Phylogenetic analysis based on 16S rRNA gene sequences indicated that the isolate was related to members of the genera and , although it appeared to be a novel lineage prior to the divergence between and . Strain Pd55 could also be differentiated from and species on the basis of its physiological properties. It is, therefore, proposed that strain Pd55 (=JCM 12420=DSM 16356) represents the type strain of a novel species in a new genus, gen. nov., sp. nov.

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2005-01-01
2024-03-29
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