Arthrobacter ulcerisalmonis sp. Nov., isolated from an ulcer of a farmed atlantic salmon (salmo salar), and emended description of the genus arthrobacter sensu lato

A Gram-stain positive, pleomorphic, oxidase-negative, non-motile isolate from the ulcer of a farmed Atlantic salmon (Salmo salar), designated strain T11b^T, was subjected to a comprehensive taxonomic investigation. A comparative analysis of the 16S rRNA gene sequence showed highest similarities to the type strains of Pseudarthrobacter siccitolerans (98.1%) and Arthro-bacter methylotrophus and Pseudarthrobacter phenanthrenivorans (both 98.0 %). The highest ANI value observed between the assembled genome of T11b^T and the publicly available Pseudarthrobacter and Arthrobacter type strain genomes were 81.15 and 80.99 %, respectively. The major respiratory quinone was menaquinone MK-9(H₂). The polyamine pattern contained pre-dominantly spermidine. The polar lipid profile consisted of the major lipids diphosphatidylglycerol, phosphatidylglycerol, monogalactosyl-diacylglycerol and dimannosylglyceride. Minor amouts of trimannosyldiacylglycerol and phosphatidylinositol were also detected. The peptidoglycan was of the type A3α l-Lys–l-Ser–l-Thr–l-Ala (A11.23). In the fatty acid profile, anteiso and iso branched fatty acids predominated (anteiso C_{15: 0}, iso C_{16: 0}, anteiso C_{17: 0}). Moderate to low DNA–DNA similarities, physiological traits as well as unique traits in the fatty acid pattern distinguished strain T11b^T from the next related species. All these data point to the fact that strain T11b^T represents a novel species of the genus Arthrobacter for which we propose the name Arthrobacter ulcerisalmonis sp. nov. The type strain is T11b^T (=CIP 111621^T=CCM 8854^T=LMG 30632^T=DSM 107127^T).