Evidence for a Satellite RNA Associated Naturally with the U5 Strain and Experimentally with the U1 Strain of Tobacco Mosaic Virus

Summary Isolates of tobacco mosaic virus strain U5 (TMV-U5) from native Nicotiana glauca plants induced the accumulation of a dsRNA (mol. wt. 0.6 × 106) in infected plants that was more abundant than the replicative form (RF) dsRNA of TMV (mol. wt. 4.3 × 106). Some but not all subcultures of such a field isolate obtained from single local lesions on N. tabacum cv. Xanthi-nc, had lost the ability to induce the 0.6 × 106 mol. wt. dsRNA....