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Sedimentation Coefficients of the Virions of Soil-Borne Wheat Mosaic Virus. Myron K. Brakke, Research Chemist, Agricultural Research Service, U.S. Department of Agriculture and also Professor, Department of Plant Pathology, University of Nebraska, Lincoln, NE 68583; Phytopathology 67:1433-1438. Accepted for publication 11 May 1977. Copyright 1977 The American Phytopathological Society, 3340 Pilot Knob Road, St. Paul, MN 55121. All rights reserved.. DOI: 10.1094/Phyto-67-1433.

The sedimentation coefficient of virion I of soil-borne wheat mosaic virus was estimated to be 219S, the same, within error, as the sedimentation coefficient of the dimer of virion II, estimated to be 218S. The monomer of virion II sedimented at 177S, and was 138 nm long. Another strain of the virus had a virion II (designated IIb) that was 92 nm long and sedimented at 159S. The two virus strains coexist in some fields.