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J Bacteriol. 1971 August; 107(2): 563-569
Copyright © 1971 American Society for Microbiology. All Rights Reserved.

Comparison of the Morphology and Deoxyribonucleic Acid Composition of 27 Strains of Nitrifying Bacteria¹

^a Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543
The University of Texas, M. D. Anderson Hospital and Tumor Institute at Houston, Houston, Texas 77025

ABSTRACT

The gross morphology, fine structure, and per cent guanine plus cytosine (GC) composition of deoxyribonucleic acid of 27 strains of nitrifying bacteria were compared. Based on morphological differences, the ammonia-oxidizing bacteria were separated into four genera. Nitrosomonas species and Nitrosocystis species formed one homogenous group, and Nitrosolobus species and Nitrosospira species formed a second homogenous group in respect to their deoxyribonucleic acid GC compositions. Similarly, the nitrite-oxidizing bacteria were separated into three genera based on their morphology. The members of two of these nitrite-oxidizing genera, Nitrobacter and Nitrococcus, had similar GC compositions, but Nitrospina gracilis had a significantly lower GC composition than the members of the other two genera.

¹ Contribution no. 2643 from the Woods Hole Oceanographic Institution, Woods Hole, Mass. 02543.

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