Two types of RNA, each with a molecular weight of approximately 0.12 × 106, designated RNA 5 and satellite RNA, have been found in purified cucumber mosaic virus (CMV) preparations and have been characterized by molecular hybridization analysis using 32P-labeled complementary DNA probes transcribed from these RNAs. RNA 5 usually makes up about 5% or less by weight of the total viral RNA and was shown to consist of specific cleavage products of CMV RNAs 1-4. Its nucleotide complexity was equivalent to about three times its molecular weight. By contrast, satellite RNA could form up to about 50% by weight of virion RNA and had the following properties: (1) It contained a unique nucleotide sequence with no homology with CMV RNAs, (2) CMV and tomato aspermy virus, but not alfalfa mosaic virus or tobacco ringspot virus, could function as helper viruses for its replication and encapsidation, (3) its nucleotide sequence was independent of the host plant and the helper virus used for its propagation and it was not derived from a host plant RNA, and (4) it was not a negative copy of any of the CMV RNA species. We concluded that this RNA is a true satellite RNA and has no relationship to the RNA found in defective interfering particles of animal viruses. © 1978.
Gould, A. R., Palukaitis, P., Symons, R. H., & Mossop, D. W. (1978). Characterization of a satellite RNA associated with cucumber mosaic virus. Virology, 84(2), 443–455. https://doi.org/10.1016/0042-6822(78)90261-1