Genetic variation in local populations of Sinorhizobium meliloti

Restriction fragment length polymorphism (RFLP) analysis was used to assess genetic variation in samples of two field populations of Sinorhizobium meliloti (from sites 2km apart) that had been characterized on the basis of phage sensitivity. Restricted genomic DNAs from 120 isolates were hybridized to each of four DNA probes from the S. meliloti chromosome, two from the symbiotic megaplasmid (pnod) and two from the nonsymbiotic megaplasmid …