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Two strains of Rhizobium phaseoli, one of which (strain 1234) was resistant to high concentrations of streptomycin, were used to inoculate plots of French beans (Phaseolus vulgaris). Bacteria were isolated from nodules and typed using their intrinsic resistance to low concentrations of seven antibiotics. The inoculum strains were a minority of isolates from inoculated plots. The high concentration streptomycin resistance character was used in the case of strain 1234 to confirm the accuracy of identification. The resident population of R. phaseoli was shown to be heterogeneous; 54 different resistance patterns were recorded. Isolates having the same intrinsic resistance pattern, with few exceptions, were uniform in their reaction with antiserum raised against one of the inoculum strains and in their colony morphology.

Demonstration of Heterogeneity in a Natural Population of Rhizobium phaseoli using Variation in Intrinsic Antibiotic Resistance