Abstract
DNA isolated from a rough variant of Streptococcus sanguis transformed smooth, competent strains of Strep. sanguis into variants with rough colonial morphology. The rough variant showed increased adherence ability and this property was transferred. A similar rough colonial morphology of Strep. mutans could not be transferred to these competent Strep. sanguis strains by transformation, suggesting that the rough morphology of Strep. mutans and that of Strep. sanguis are determined by different genetic markers. The smooth and rough variants of Strep sanguis had different growth rates. The logarithmic phase of the smooth wild-type was significantly shorter than that of the rough variant.
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