Hyphomonas sediminis sp. nov., isolated from marine sediment.

A Gram-staining-negative, aerobic and pear-shaped bacterial strain, designated WL0036T, was isolated from coastal sediment sample collected in Nantong city, Jiangsu province of China (120° 51' 13″ E, 32° 6' 26″ N) in October 2020. Strain WL0036T was found to grow at 20-37 °C (optimum, 28 °C) with 0-9.0% NaCl (optimum, 2.5-4.0%) and displayed alkaliphilic growth with the pH range of pH 6.0-10.0 (optimum, pH 7.0-8.0). The polar lipids profile of strain WL0036T included phosphatidylcholine, phosphatidylethanolamine, glycolipid and an unidentified lipid. The major isoprenoid quinone was determined to be Q-11 and the major fatty acids were C16:0, 11-methyl-C18:1ω7c, and summed features 8 (C18:1ω6c and/or C18:1ω7c). The G + C content of genomic DNA was 61.8%. Phylogenetic trees constructed based on 16S rRNA gene sequence and bac120 gene set (a collection of 120 single-copy protein sequences prevalent in bacteria) indicted that strain WL0036T clustered with strains Hyphomonas neptunium ATCC 15444T and H. polymorpha PS728T. The average nucleotide identities between strain WL0036T and strains H. neptunium ATCC 15444T and H. polymorpha PS728T were 80.7% and 81.2%, respectively. Strain WL0036T showed 22.8% and 23.2% of digital DNA-DNA hybridization identities with H. neptunium ATCC 15444T and H. polymorpha PS728T, respectively. As inferred from the phenotypic and genotypic characteristics and the phylogenetic trees, strain WL0036T ought to be recognized as a novel species in genus Hyphomonas, for which the name Hyphomonas sediminis sp. nov. is proposed. The type strain is WL0036T (= MCCC 1K05843T = JCM 34658T = GDMCC 1.2413T).

Sphingopyxis jiangsuensis sp. nov. Isolated From the Surface Water of the Yellow Sea.

A novel bacterium, designated strain XHP0097T, was isolated from the surface water of the Yellow Sea, China. The cells were Gram-stain-negative, aerobic, rod-shaped, yellow-colored, and non-motile on 2216E agar. Optimal growth of strain XHP0097T occurs at 28 °C and pH 7.0 with the presence of NaCl concentration 2% (w/v). According to the analysis of comparative 16S rRNA gene sequence, strain XHP0097T showed the highest 16S rRNA gene sequence similarity with Sphingopyxis panaciterrulae KCTC 22112T (98.2%). Phylogenetic analysis based on 16S rRNA gene sequences as well as on 120 ubiquitous single-copy protein-coding genes supported that strain XHP0097T formed a distinct phyletic lineage as a new species within the genus Sphingopyxis. Strain XHP0097T showed an average nucleotide identity value and a digital DNA-DNA hybridization (dDDH) of 79.1-81.7% and 21.9-24.4% to the members of the genus Sphingopyxis, respectively. According to genome sequence, the DNA G + C content of XHP0097T was 64.8%. The major fatty acids (>10%) were C16:0 (17.5%), summed feature 3 (C16:1ω7c and/or C16:1ω6c) (15.1%), and summed feature 8 (C18:1ω7c and/or C18:1ω6c) (19.2%). The major polar lipids of strain XHP0097T were phosphatidylcholine (PC), phosphatidylethanolamine (PE), phosphatidylglycerol (PG), diphosphatidylglycerol (DPG), and sphingoglycolipid (SGL). Q-10 was the predominant respiratory quinone. Characteristics of physiological and biochemical, phylogenetic, and chemotaxonomic analysis demonstrated the isolate XHP0097T represents a novel species of the genus Sphingopyxis, for which the name Sphingopyxis jiangsuensis sp. nov. is proposed. The type strain is XHP0097T (=MCCC 1K05845T = GDMCC 1.2415T = JCM 34678T).