1887

Abstract

A novel heterotrophic, Gram-stain-negative, aerobic, rod-shaped bacterium, designated as strain MT5, was isolated from deep seawater in the Mariana Trench and characterized phylogenetically and phenotypically. Bacterial optimal growth occurred at 28 °C (range, 4–45 °C), pH 5–7 (pH 4–11) and with 3–7 % (w/v) NaCl (0–18 %). Phylogenetic analysis based on 16S rRNA gene sequence showed that strain MT5 was related to members of the genus Pseudomonas and shared the highest sequence identities with Pseudomonas pachastrellae CCUG 46540 (99.6 %), Pseudomonas aestusnigri VGXO14 (98.5 %) and Pseudomonas oceani KX 20 (98.4 %). The 16S rRNA gene sequence identities between strain MT5 and other members of the genus Pseudomonas were below 96.7 %. The digital DNA–DNA hybridization values between strain MT5 and the two type strains, P. pachastrellae and P. aestusnigri , were 38.9±2.5 and 25.8±2.4 %, respectively. The average nucleotide identity values between strain MT5 and the two type strains were 90.3 and 87.0 %, respectively. Strain MT5 and the two type strains shared 94.98 and 86.2 % average amino acid identity, and 30 and 33 Karlin genomic signature, respectively. The sole respiratory menaquinone was Q-9. The major polar lipids were phosphatidylethanolamine, diphosphatidyglycerol and phosphatidylglycerol. The predominant cellular fatty acids of strain MT5 were summed feature 8 (C18 : 1ω7c and/or C18 : 1ω6c) (35.3 %), summed feature 3 (C16 : 1ω7c and/or C16 : 1ω6c) (24.1 %), C16 : 0 (15.9 %) and C12 : 0 (7.2 %). The G+C content of the genomic DNA was 61.2 mol%. The combined genotypic and phenotypic data indicated that strain MT5 represents a novel species of the genus Pseudomonas , for which the name Pseudomonas abyssi sp. nov. is proposed, with the type strain MT5 (=KCTC 62295=MCCC 1K03351).

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2018-06-21
2019-08-18
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