Protein composition of unusual tobacco mosaic virus strains

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Abstract
Amino acid analyses have been made of the proteins of single-lesion isolates of five strains of tobacco mosaic virus (TMV) differentiated by Lycopersicon hosts. These hosts differed in their genetical control of resistance to TMV, and the virus strains had therefore survived specific selection pressures. Two of the five strains differed in their amino acid composition from type TMV and from all other tomato strains of TMV previously examined. Symptoms induced by the five strains in four tomato lines and in Nicotiana tabacum cvs White Burley and Kawala are described.