Abstract
Indigenous strains of R. trifolii, originating from different geographical regions, were compared using total DNA restriction analysis, plasmid DNA profiles and intrinsic antibiotic resistance patterns. The results of strain relatedness using 2 of these techniques (DNA restriction and antibiotic resistance patterns) were similar, and indicated that these strains formed a heterogeneous group. A large variation in plasmid DNA profiles was observed among the R. trifolii isolates investigated, indicating heterogeneity of plasmid DNA pools. This variation occurred even in some strains that were shown to be related on the basis of their antibiotic resistance patterns. The application of these techniques to differentiate indigenous R. trifolii strains is discussed in this report.
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