Abstract
A unicellular manganese-oxidizing bacterium (strain L7), isolated from Lake Ladoga, is identified as "Siderocapsa" sp. according to its morphology. However, this bacterium belongs to the phylogenetic cluster of Pseudomonas putida. The physiological characteristics (utilization of sugars, polyatomic alcohols, organic acids, and phenolic substrates as carbon and energy sources) also indicate the similarity of strain L7 to representatives of the genus Pseudomonas. The growing culture oxidizes Mn(II); the rate of oxidation depends on the type of added organic substrate. Carbonate requirement for this process indicates mixotrophic metabolism. The relatedness of the isolated bacterium to the representatives of the genus Pseudonomas and their phenotypic similarity provide a basis for considering strain L7 not as "Siderocapsa" sp., but as a new species, Pseudomonas siderocapsa sp. nov., of the P. putida cluster.
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