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Meso-tartrate resistance and phylogenetic relationships of biotypes of Salmonella typhimurium
Published online by Cambridge University Press: 14 April 2009
Summary
Meso-tartrate utilizing and resistant (mT+) recombinants were produced readily in transductions from an mT+ donor strain to 42 naturally occurring meso-tartrate non-utilizing and sensitive (mT−) recipient strains of Salmonella typhimurium, and were produced, sometimes as frequently, in interbiotype crosses between different pairs of strains from the mT− biotypes 2, 18, 26 and of the FIRN group (biotypes 30 and 32). These findings suggested that the sites of the mta mutations were independent in strains from the different mT− biotypes and were in agreement with their probable different lines of descent. Intrabiotype crosses indicated genetic homogeneity among strains of biotype 26 and among strains of biotype 30; on the other hand, they suggested that in each of the biotypes 2, 18 and 32, a minority of strains had mta mutations present at different intragenic sites from those of the majority of strains. The derivations of the strains of the minority types are discussed.
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