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Forty-eight strains representing the eight recognized Rhizobium species, two new Phaseolus bean Rhizobium genomic species, Bradyrhizobium spp., Agrobacterium spp., and unclassified rhizobia from various host plants were examined by restriction fragment length polymorphism (RFLP) analysis of 16S rRNA genes amplified by polymerase chain reaction (PCR). Twenty-one composite genotypes were obtained from the combined data of the RFLP analysis with nine endonucleases. Species assignments were in full agreement with the established taxonomic classification. Estimation from these data of genetic relationships between and within genera and species correlated well with previously published data based on DNA-rRNA hybridizations and sequence analysis of 16S rRNA genes. This PCR-RFLP method provides a rapid tool for the identification of root nodule isolates and the detection of new taxa.

Rapid Identification of Rhizobia by Restriction Fragment Length Polymorphism Analysis of PCR-Amplified 16S rRNA Genes