Abstract
Six strains of turnip yellow mosaic virus and one each of wild cucumber mosaic virus and turnip crinkle virus have been analysed for the amino acid composition of their proteins, the base ratios and the products of pancreatic ribo-nuclease digestion of their RNA. The results for TYMV show that the six strains fall into two well-defined groups clearly defined by the content of cytosine which averaged 38·2% (molar % of total bases) in one group and 41·6% in the other. Within each group there are no significant differences between the animo acid compositions of the proteins but there are a number of marked differences between the groups. Likewise the amounts of the mono-, di- and most of the tri-nucleotides produced by ribo-nuclease digestion showed many differences between the groups whereas within each group smaller but statistically significant differences were found. WCMV has a base ratio similar to, and TCV a base ratio very different from those of TYMV. Many large differences in amino acid composition and base sequence were found both between these two viruses and the six strains of TYMV. No close correlations between base sequence and amino acid composition were found but differences in base composition and sequence were accompanied by marked differences in amino acid composition.
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