Echinochloa ragged stunt virus (ERSV) and rice ragged stunt virus (RRSV; Reoviridae) were purified from their respective host plants and disrupted in SDS. Evidence for the double-strandedness of ERSV RNA was obtained. Electrophoresis in 10% polyacryl-amide gels resolved the RNAs of each virus into 10 segments, ranging for ERSV from 0.61 × 106 to 2.8 × 106 daltons, with a sum representing the total genome of 17.89 × 106 daltons, and for RRSV from 0.6 × 106 to 2.98 × 106 daltons, with a sum of 18.15 × 106 daltons. Although the overall RNA pattern of the two viruses was similar, there were distinctive features. Using 7.5–15% polyacrylamide gels, electrophoresis of SDS-dissociated RRSV particles yielded five major proteins of 129 × 103,123 × 103, 63 × 103 and 35 × 103 daltons, and two minor proteins of 113 × 103 and 88 × 103 daltons, respectively, while comparable samples of ERSV yielded four major proteins of 127 × 103,123 × 103,63 × 103 and 34 × 103 daltons, and three minor proteins of 103 × 103,50 × 103 and 49 × 103 daltons, respectively. We conclude from this and other evidence that ERSV and RRSV are closely related viruses and should be classified in the same subgroup, despite reported differences in the morphology of their outer capsids.

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