Deoxyribonucleic acid homology experiments were performed among representative strains of , and and other nitrogen-fixing strains identified as -like. All strains showed less than 20% homology when or was used as a probe. The range of homology among strains (strain P3L-5[T = type strain] was used as the probe) varied from 54 to 100%, indicating that these strains comprise a relatively homogeneous species. Strain Hino appears to be a variant of because it exhibited only 28 to 44% homology with this species. Strains P3L-2, CR5D-16, and CR5D-23 showed less than 20% homology with , and , indicating that these strains do not belong to these species. Additional data will be necessary to fully clarify the taxonomy of these nitrogen-fixing strains.


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