Synthesis, Accumulation and Encapsidation of Individual Brome Mosaic Virus RNA Components in Barley Protoplasts

The rates of virus RNA synthesis and virion accumulation were investigated in brome mosaic virus-infected barley protoplasts. Single-stranded virus RNAs could be detected as early as 6 h after inoculation. Only RNA components I and z were detected at this time, suggesting that their synthesis i initiated relatively early in infection. The RNAs were synthesized atsimilar rates from t 6 to 35 h post inocu-lation with maximal synthesis until approx. 25 h after inoculation. Double-stranded replicative forms of the four virus RNAs were observed. Their synthesis was first detectable at 6 h post inoculation and followed a time course similar to that of the single-stranded RNA species. Analysis of RNA encapsidation a d infectivity assays of protoplast homogenates revealed that virion formation was greatest between IO and 25 h after inoculation. All four RNAs were present in virions at IO h post inoculation. Particles containing RNA 3 and RNA 4 accumulated at a faster rate than particles containing RNA I or RNA 2