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The carbon monoxide-utilizing hydrogen bacterium DSM 1083 (Carboxydo- bacterium strain Z- 1062), the type strain of Seliberia carboxydohydrogena, was found to be a monotrichous, nonbudding, rarely screw-sculptured bacterium which did not convert lactose to 3-ketolactose and which was not pathogenic for tomatoes. Because of these properties and its strictly aerobic metabolism, it is proposed that this organism be transferred from the genus Seliberia to the genus Pseudomonas as Pseudomonas carboxydohydrogena (Sanjieva and Zavarzin) comb. nov. This species is distinctly different from other CO-utilizing pseudo- monads with regard to guanosine plus cytosine content, substrate utilization spectrum, and extent of star formation. To date, only a few bacteria have been de- scribed which are able to utilize carbon monox- ide aerobically as a sole source of carbon and energy: Hydrogenomonas carboxydovorans (10, 1 l), Pseudomonas carboxydovorans (la), Seli- beria carboxydohydrogena (20, 21, 28), Pseu- domonas carboxydoflava (27, 28), Pseudomo- nas gazotropha (27,28), Comamonas compran- soris (27, 28), and Achromobacter carboxydus (27, 28). All carbon monoxide-utilizing bacteria known so far can grow as hydrogen bacteria as well, and they are either nonmotile or motile by means of a polarly or subpolarly inserted flagellum (18, 28). With the exception of S. carboxydohydro- gena, the bacteria of this physiologic group were reported to be pseudomonads or pseudomonad- like organisms (18,28). Electron microscope ob- servations of cells of S. carboxydohydrogena never showed budding processes, and clearly spiral cells were rarely encountered. This finding and the strictly respiratory metabolism of S. carboxydohydrogena prompted us to investi- gate the taxonomic position of this organism in detail.

international journal of systematic bacteriology

Pseudomonas carboxydohydrogena (Sanjieva and Zavarzin) comb. nov., a Monotrichous, Nonbudding, Strictly Aerobic, Carbon Monoxide-Utilizing Hydrogen Bacterium Previously Assigned to Seliberia