Devosia alba sp. nov., a potential nitrite-reducing bacterium isolated from a mudflat
摘要
A Gram-stain-negative, obligately aerobic, motile with polar and lateral flagella and rod-shaped bacterium (1.0–1.5 μm long, 0.4–0.6 μm wide), designated RY10T, was isolated from a mudflat in Zhejiang province, China. Strain RY10T grew at 15–37 °C (optimum 25 °C) and pH 5.0–8.0 (optimum 7.0) and in the presence of 0–4.0% (w/v) NaCl (optimum 2.0–3.0%). Chemotaxonomic analysis indicated that the major respiratory quinone was Q-10, the dominant cellular fatty acids were C16:0, C18:0, summed feature 3 (C16:1 ω7c and/or C16:1 ω6c) and summed feature 8 (C18:1 ω7c), and the major polar lipids were phosphatidylglycerol, diphosphatidylglycerol, two unknown phosphoglycolipids and two unknown aminolipids. The DNA G + C content of strain RY10T was 62.3% based on its genomic sequence. Phylogenetic analysis based on 16S rRNA gene sequences revealed that strain RY10T formed a distinct lineage within the clade of the genus Devosia. Strain RY10T also exhibit low digital DNA-DNA hybridization (< 70%) and average nucleotide identity values (< 95%) with other Devosia species. Based on the polyphasic taxonomic characterization, strain RY10T is considered to represent a novel species of genus Devosia, for which the name Devosia alba sp. nov. is proposed. The type strain is RY10T (= MCCC 1K03748T = KCTC 72161T).