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Isolated nuclei from healthy pea plants were primed with pea enation mosaic virus (PEMV), southern bean mosaic virus (SBMV), radish mosaic virus (RdMV), tobacco mosaic virus (TMV), PEMV RNA, SBMV RNA, RdMV RNA, or TMV RNA. RNA replication occurred only with PEMV RNA and not with intact PEMV or any of the other viruses or RNAs, as judged by ensuing actinomycin D-insensitive polymerase activity. Molecular hybridization experiments showed that some of the product of the polymerase was PEMV-specific (-)RNA. The substrate and ionic requirements of this polymerase were the same as those for the RNA-dependent RNA polymerase present in nuclei isolated from PEMV-infected pea plants. No virus particles could be recovered from nuclei primed with PEMV RNA. These results are discussed in relation to the possible mechanism for in vivo infection of pea cells.

Replication of pea enation mosaic virus RNA in isolated pea nuclei