Danxiaibacter flavus gen. nov., sp. nov., a novel bacterium of the family Chitinophagaceae isolated from forest soil on Danxia Mountain

A Gram-stain-negative, aerobic, short rod-shaped, yellow bacterium, designated SYSU DXS3180(T), was isolated from forest soil of Danxia Mountain in PR China. Growth occurred at 15-37 degrees C (optimum, 28-30 degrees C), pH 6.0-10.0 (optimum, pH 7.0-8.0) and with 0-2.0 % NaCl (optimum, 0-0.5 %, w/v). Strain SYSU DXS3180(T) was positive for hydrolysis of Tween 20, Tween 60, Tween 80 and starch, but negative for urease, H2S production, nitrate reduction, Tween 40 and gelatin. Phylogenetic analysis based on 16S rRNA gene and genome sequences showed that SYSU DXS3180(T) belonged to the family Chitinophagaceae. The closely related members were Foetidibacter luteolus YG09(T) (94.2 %), Limnovirga soli KCS-6(T) (93.9 %) and Filimonas endophytica SR 2-06(T) (93.7 %). The genome of strain SYSU DXS3180(T) was 7287640 bp with 5782 protein-coding genes, and the genomic DNA G+C content was 41.4 mol%. The main respiratory quinone was MK-7 and the major fatty acids (>10 %) were iso-C-15 : 0, iso-C-17 : 0 3-OH and iso-C-15 : 1 G. The major polar lipids consisted of phosphatidylethanolamine, two unidentified aminolipids and two unidentified polar lipids. Based on the phylogenetic, phenotypic and chemotaxonomic characteristics, strain SYSU DXS3180(T) is proposed to represent a novel species of a novel genus named Danxiaibacter flavus gen. nov., sp. nov., within the family Chitinophagaceae. The type strain is SYSU DXS3180(T) (=KCTC 92895(T)=GDMCC 1.3825 (T)).