Dyadobacter flavalbus sp. nov., isolated from lake sediment

A novel bacterial strain, designated NS28^T, was isolated from interfacial sediment sampled at Taihu Lake, PR China. Cells were rod-shaped, Gram-negative, aerobic and non-motile on Reasoner's 2A medium. The results of phylogenetic analysis based on 16S rRNA gene sequences indicated that strain NS28^T was most closely related to species from the genus Dyadobacter, with 98.4 and 96.0 % 16S rRNA gene sequence similarity to its closest phylogenetic neighbours Dyadobacter sediminis CGMCC 1.12895^T and Dyadobacter luticola CCTCC AB 2017091^T, respectively. MK-7 was the only cellular menaquinone. The major fatty acids were summed feature 3 (C_16 : 1ω7c and/or C_16 : 1ω6c), iso-C_15 : 0 and C_16 : 1ω5c. The major polar lipids were phosphatidylethanolamine, one phospholipid, one aminolipid, one lipid and two unidentified lipids. Genomic analysis of strain NS28^T indicated that the total genome size was 6 477 094 bp with a G+C content of 44.8 mol%, 5380 protein-coding genes, 79 contigs and an N50 length of 299584 bp. On the basis of the genomic DNA sequence, the average nucleotide identity values were 90.5 and 74.1 % with D. sediminis CGMCC 1.12895^T and D. luticola CCTCC AB 2017091^T, respectively. Digital DNA-DNA hybridization results of strain NS28^T with D. sediminis CGMCC 1.12895^T and D. luticola CCTCC AB 2017091^T were 40.9 and 18.6 %, respectively. Based on the phenotypic, chemotaxonomic, phylogenetic and genome sequence data presented here, it is proposed that strain NS28^T represents a novel species of the genus Dyadobacter for which the name Dyadobacter flavalbus is proposed . The type strain is NS28^T (=NBRC 113854^T=MCCC 1K03764^T).