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Genetic Analysis of Cowpea Chlorotic Mottle and Brome Mosaic Viruses

John Innes Institute, Colney Lane, Norwich NOR 70F, England

We have assigned mutations in cowpea chlorotic mottle virus and the related brome mosaic virus to specific RNA components. Coat protein changes, as well as associated ‘maturation faults’ and systemic symptom changes, are located on RNA species 3; local and primary lesion alterations are found on either RNA species 2 or 3. Changes in nucleoprotein component ratio are associated either with the coat protein changes on RNA species 3 or with primary lesion alterations on species 2. Local lesion temperature sensitivity is found on RNA species 1.

Received 4 December 1972; accepted 29 January 1973.