Colwellia piezophila sp. nov., a novel piezophilic species from deep-sea sediments of the Japan Trench

International Journal of Systematic and Evolutionary Microbiology
Yuichi NogiKoki Horikoshi

Abstract

Two strains of obligately piezophilic bacteria were isolated from sediment collected from the bottom surface of a small canyon on the seaward slope of the Japan Trench at a depth of 6278 m. The isolated strains, Y223GT and Y251E, are closely affiliated with members of the genus Colwellia on the basis of 16S rRNA gene sequence analysis. The G + C contents of both strains were about 39 mol%. DNA-DNA hybridization values between these strains and Colwellia reference strains were significantly lower than those accepted as the phylogenetic definition of a species. The novel strains are Gram-negative, polarly flagellated and facultatively anaerobic. The optimal pressure for growth was 60 MPa at both 4 and 10 degrees C; the most rapid growth rate was observed at 10 degrees C and 60 MPa. No growth occurred at 15 degrees C under any pressure studied. The major isoprenoid quinone is Q-8. The predominant cellular fatty acids are C16 : 0 and C16 : 1. Based on the taxonomic differences observed, the isolated strains appear to represent a novel obligately piezophilic Colwellia species. The name Colwellia piezophila sp. nov. (type strain Y223GT = JCM 11831T = ATCC BAA-637T) is proposed.

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Citations

Jan 18, 2007·Extremophiles : Life Under Extreme Conditions·Federico M Lauro, Douglas H Bartlett
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