protoplasts inoculated with raspberry ringspot virus accumulated top component (T), middle component (M) and bottom component (B) particles progressively from about 20 h post-infection (p.i.) until at least 73 h p.i.; the ratio between the amounts of T and B particles changed little during the multiplication cycle of the virus. In contrast, in raspberry ringspot virus-infected protoplasts although the accumulation of T particles continued up to at least 91 h p.i., the accumulation of B and M particles decreased greatly or ceased after about 60 h p.i. In either species of protoplast there was no evidence that T particles arose from B or M particles although some physical treatments did cause an apparent loss of nucleic acid from B and M particles.


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