Hydrogenophaga soli sp. nov., isolated from rice field soil

A novel Gram-stain-negative bacterial strain, designated strain S10 T , was isolated from soil collected in a rice field in Goyang, South Korea. Cells of strain S10 T were strictly aerobic, motile and rod-shaped. Colonies were round, convex, smooth and white. The strain grew optimally at 37 °C, pH 7.0 and 0 % (w/v) NaCl. Phylogenetic analysis of the 16S rRNA gene sequence of strain S10 T revealed that the bacterium belongs to the family Comamonadaceae and is related to members of the genus Hydrogenophaga, with Hydrogenophaga caeni EMB71 T being its closest relative (97.9 % sequence similarity). The DNA G+C content of strain S10 T was 68.2 mol%. Strain S10 T contained phosphatidylethanolamine and diphosphatidylglycerol as the major polar lipids. The major fatty acids were C16 : 0 and summed feature 3 (C16 : 1ω7c and/or iso-C15 : 0 2-OH). The predominant respiratory quinone was ubiquinone Q-8. DNA-DNA hybridization values of strain S10 T with Hydrogenophaga caeni KCTC 12613 T , Hydrogenophaga atypica DSM 15342 T and Hydrogenophaga defluvii DSM 15341 T were 16.1±4.8, 49.0±3.2 and 21.9±8.8 %, respectively. Based on phylogenetic distinctiveness, DNA-DNA hybridization and specific physiological and biochemical characteristics, strain S10 T (=KCTC 52520 T =JCM 31711 T ) is classified as a novel species of the genus Hydrogenophaga, for which the name Hydrogenophagasoli sp. nov. is proposed.