Rhodoligotrophos appendicifer gen. nov., sp. nov., an appendaged bacterium isolated from a freshwater Antarctic lake
A Gram-stain-negative, non-spore-forming, non-motile, irregularly circular, aerobic/microaerobic appendaged bacterium (strain 120-1T) was isolated from Naga-ike, one of the freshwater lakes in the Skarvsnes ice-free area of Antarctica. Strain 120-1T grew between 5 and 35 °C, with optimum growth at 30 °C. The pH range for growth was between 6.0 and 9.0 (optimum of approximately pH 7.0). The range of NaCl concentration allowing growth of strain 120-1T was between 0 and 5.0 %, with an optimum of 0.5–1.0 %. Strain 120-1T was able to utilize organic compounds such as glucose, arabinose, gluconate, adipate and malate. Red colonies were formed on plate medium and the carotenoids were present in the cells. Ubiquinones Q-9 and Q-10 were the major respiratory quinones. The major cellular fatty acids were C16 : 0, C18 : 1ω9c and C18 : 1ω7c. The G+C content of the genomic DNA was 61.1 mol%. Comparative analyses of 16S rRNA gene sequences and physiological characteristics of strain 120-1T indicate that strain 120-1T is a phylogenetically novel bacterium, and that it represents a novel species in a new genus, Rhodoligotrophos gen. nov., in the order Rhizobiales , family Rhodobiaceae . The name Rhodoligotrophos appendicifer gen. nov. sp. nov. is proposed as the type species of this new genus, with 120-1T ( = JCM 16873T = ATCC BAA-2115T) as the type strain.