Phylogenetic Relationships between different D‐Xylose Biogroups in Wild‐type Salmonella typhimurium strains and a suggested Evolutionary Pathway

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Abstract
Sixty‐two wild‐type Salmonella typhimurium strains were characterized for their D‐xylose enzyme activities. Strains from the xylose strong biogroup synthesized high levels of D‐xylose isomerase and D‐xylulokinase and transported D‐xylose. Strains from the xylose weak biogroup synthesized only low levels of D‐xylulokinase and low, or no, levels of D‐xylose isomerase and were deficient in the ability to transport D‐xylose. These findings are discussed in the light of known phylogenetic relationships among the biotypes of Salm. typhimurium.