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Alfalfa mosaic virus (AMV) and Prunus necrotic ringspot virus (PNRSV) belong to the genera ALFAMOVIRUS: and ILARVIRUS:, respectively, of the family BROMOVIRIDAE: Initiation of infection by AMV and PNRSV requires binding of a few molecules of coat protein (CP) to the 3' termini of the inoculum RNAs and the CPs of the two viruses are interchangeable in this early step of the replication cycle. CIS:-acting sequences in PNRSV RNA 3 that are recognized by the AMV replicase were studied in in vitro replicase assays and by inoculation of AMV-PNRSV RNA 3 chimeras to tobacco plants and protoplasts transformed with the AMV replicase genes (P12 plants). The results showed that the AMV replicase recognized the promoter for minus-strand RNA synthesis in PNRSV RNA 3 but not the promoter for plus-strand RNA synthesis. A chimeric RNA with PNRSV movement protein and CP genes accumulated in tobacco, which is a non-host for PNRSV.

Recognition of cis-acting sequences in RNA 3 of Prunus necrotic ringspot virus by the replicase of Alfalfa mosaic virus