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Variation in the virulence of some streptomycin resistant mutants of Pseudomonas phaseolicola.

One strain of each of the 2 races of Pseudomonas phaseolicola was tested for in vitro resistance to streptomycin. The race 1 strain showed a greater resistance to the antibiotic than the race 2 strain. Resistant mutants were isolated from each strain and used to infect plants of Phaseolus vulgaris cv. Higuerillo V 345. Variation was noted in both the range of symptoms produced and in the numbers of bacteria re-isolated from the plants. Some mutants retained their resistance after passage through the plant while others reverted back to parental type.