1887

Abstract

Two -like bacterial strains, WP2 and WP3, which were isolated from west Pacific deep-sea sediment, were studied to determine their taxonomic position. Cells of the two bacteria were facultatively anaerobic, Gram-negative rods and motile by means of a single polar flagellum. Strain WP2 was psychrophilic, growing optimally at about 10–15 °C, whereas strain WP3 was psychrotolerant, growing optimally at 15–20 °C. The two strains grew in the pressure range 0.1–50 MPa, with optimal growth at 20 MPa. Strain WP3 was able to use nitrate, fumarate, trimethylamine -oxide (TMAO), DMSO and insoluble Fe(III) as terminal electron acceptors during anaerobic growth, whereas strain WP2 was able to use only nitrate, TMAO and DMSO. The 16S rRNA gene sequences of strains WP2 and WP3 were 97 % identical, and showed highest similarity (97 %) to those of KMM 3589 and ATCC 43992, respectively. The gene sequences of strains WP2and WP3 were also determined, and showed highest similarity to those of JCM 10179 (90 %) and SM2-1 (87 %), respectively. Contrary to the 16S rRNA gene sequence results, the phylogeny based on gene sequence analysis placed strain WP2, and in one group, while strain WP3 grouped with and . DNA–DNA hybridization experiments supported the placement of strain WP2 with and . Phylogenetic evidence, together with DNA–DNA relatedness and phenotypic characteristics, indicated that the two new strains represented two novel deep-sea species. The names sp. nov. (type strain WP2=JCM 13876=CGMCC 1.6159) and (type strain WP3=JCM 13877=CGMCC 1.6160) are proposed.

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2007-01-01
2019-10-17
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