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DNA base composition and classification of some more free-living nitrogen-fixing bacteria

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Abstract

The recently discoveredAzotobacter paspali has a % GC of 63.2–64.6. This value and the described physiological and biochemical features, justify its inclusion in the genusAzotobacter. Its % GC which is somewhat lower than that of the other members of this genus, and several unusual phenotypic properties, confirm its status as a separate species.

Azotobacter miscellum ATCC 17962 has the same % GC value asAzotobacter vinelandii.

Azotomonas insolita NCIB 8627 (58.9% GC) andAzotomonas fluorescens NCIB 9884 (64.8% GC) have peritrichous flagella. They do not belong to the genus to which they have been assigned; besides, the existence of the genusAzotomonas still remains to be ascertained.

Pseudomonas azotocolligans NCIB 9391 (65.6% GC) also has peritrichous flagella. It should be removed from the genusPseudomonas. The taxonomic position of the latter three organisms is still unknown.

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  1. Laboratory for Microbiology, Faculty of Sciences, State University, Gent, Belgium

    J. De Ley

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  1. J. De Ley
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De Ley, J. DNA base composition and classification of some more free-living nitrogen-fixing bacteria. Antonie van Leeuwenhoek 34, 66–70 (1968). https://doi.org/10.1007/BF02046415

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