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J Gen Virol 65 (1984), 119-127; DOI 10.1099/0022-1317-65-1-119
© 1984 Society for General Microbiology
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Two Purified RNAs of Soil-borne Wheat Mosaic Virus are Needed for Infection

Yukio Shirako{dagger} and Myron K. Brakke

Agricultural Research Service, U.S. Department of Agriculture and Department of Plant Pathology, Nebraska Agricultural Experiment Station, University of Nebraska, Lincoln, Nebraska 68583, U.S.A.

RNAs of soil-borne wheat mosaic virus (SBWMV) from virions 281 nm, 138 nm and 92 nm long (designated here by relative lengths as 1.0L, 0.5L and 0.35L, respectively), were isolated and purified by three cycles of sucrose density gradient centrifugation. Infectivity assays with these RNAs proved the bipartite nature of SBWMV, the combination of 1.0L and either 0.5L or 0.35L RNAs being required for infection and for multiplication of progeny viruses. The 0.5L RNA underwent deletion mutation, producing smaller variants with various sizes, of which 0.4L and 0.35L RNAs were confirmed to be functional in combination with 1.0L RNA. The coat proteins of all isolates had mol. wt. of 19700. The mol. wt. of 1.0L, 0.5L, 0.4L and 0.35L RNAs, determined under denaturing conditions, were 2.28 x 106 (6500 bases), 1.23 x 106 (3500 bases), 0.97 x 106 (2800 bases) and 0.86 x 106 (2450 bases), respectively. A new virus group, furovirus (fungus-borne rod-shaped virus), is proposed for SBWMV.

Keywords: SBWMV, deletion mutant, bipartite, furovirus

{dagger} Present address: Faculty of Agriculture, Tohoku University, 1-1 Tsutsumidori-Amamiyamachi, Sendai 980, Japan.

Received 2 June 1983; accepted 13 September 1983.




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Copyright © 1984 by the Society for General Microbiology.