Following nitrous acid mutagenesis of cowpea mosaic virus (CPMV) virion RNA, a mutant has been isolated which is able to grow in Phaseolus vulgaris but is unable to grow in the ‘Early Red’ or ‘Blackeye Early Ramshorn’ varieties of cowpea (Vigna unguiculata). Dot blot analysis failed to detect virus-specific RNA in ‘Blackeye Early Ramshorn’ plants which had been inoculated with mutant 7A-4, indicating that no CPMV RNA synthesis had occurred. Supplementation experiments showed that the mutation was located in B RNA.
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