Abstract
SUMMARY The capsid proteins of three potato virus X isolates that belong to different strain groups on the basis of their reactions with host resistance genes have been compared by means of SDS-PAGE and partial proteolysis mapping. Considerable differences were observed in both the migration rates in SDS-PAGE and the peptide patterns generated after partial digestion with V8 protease of the capsid proteins of the isolates. The high molecular weight proteins synthesized by in vitro translation of genomic RNAs extracted from the three isolates were electrophoretically indistinguishable and antigenically unrelated to capsid proteins.
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