The taxonomic position of Arthrobacter siderocapsulatus Dubinina and Zhdanov 1975AL was investigated using 16S rDNA, fatty acid and phenotypic analyses. The type strain (NCIMB 11286T) showed 99.85% 16S rDNA similarity to the type strain of Pseudomonas putida. Phenotypic properties of the two strains were compared using API 20NE and BIOLOG kits. Identical reactions were recorded for all tests, except for assimilation of malonic acid. The two strains also showed almost identical cellular fatty acid profiles. On the basis of evidence presented in this and earlier studies, it is proposed that Arthrobacter siderocapsulatus is a later subjective synonym of Pseudomonas putida (Trevisan 1889) Migula 1895AL.


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