SUMMARY: Phage-resistant mutants were obtained from four strains of . Mutation to phage resistance tended to coincide with mutations in other features, such as morphology of colonies or effectiveness in nitrogen fixation. The accompanying mutations occurred independently, and their frequency varied widely from strain to strain.

Some mutants seemed stable in their newly acquired features; others continued to mutate at high rates.

Some of the mutants as regards nitrogen fixation were stable or could eventually be stabilized, but other mutants derived from one of the parent strains remained unstable even after several successive replatings or passages through nodules.


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