Ribosomal ribonucleic acid (RNA) homology studies indicated that there is 90 to 96% homology between and and 64 to 70% homology between these two species and . These findings support the inclusion of these three species in the genus . In contrast, “” strains showed very little homology with the other species (< 22% RNA homology) and should not be considered a member of this genus. The taxonomic placement of “” is uncertain. The nearest relatives of the genus were and (>65% RNA homology); and exhibited 30 to 60% RNA homology with species. Deoxyribonucleic acid studies indicated that subsp. was related to at a level of deoxyribonucleic acid homology of >45% and at a level of RNA homology of 99%; moreover, this organism was found to be a microaerophilic nitrogen fixer. Thus, subsp. is a subjective synonym of . In contrast, deoxyribonucleic acid homology studies indicated that subsp. is not related to , or any other species tested, and its taxonomic position is uncertain. Several strains of azospirilla which form unique star-shaped colonies were identified as by deoxyribonucleic acid homology.


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