Partial Characterization of a Soybean Strain of Tobacco Mosaic Virus. L. L. McDANIEL, Associate Collection Manager; American Type Culture Collection (ATCC), Rockville, MD. M. L. MARATOS, Biologist Specialist, and J. E. GOODMAN, Biologist, American Type Culture Collection (ATCC), Rockville, MD; and S. A. TOLIN, Professor, Virginia Polytechnic Institute and State University, Blacksburg. Plant Dis. 79:206-211. Accepted for publication 21 October 1994. Copyright 1995 The American Phytopathological Society 206. DOI: 10.1094/PD-79-0206.

Properties ofa strain of tobacco mosaic virus (TMV-S) originally isolated from soybean (Glycine max) were compared with those of two isolates of the common strain of TMV (ATCC PV-135 and PV-220), one TMV strain infecting bean (Phaseolus vulgaris) (TMV-B, ATCC PV-742), and sunnhemp mosaic virus (SHMV, ATCC PV-744). The virion capsid protein subunits of the common and soybean strains were 21 kDa. Reduced and alkylated capsid proteins of TMV-B and SHMV migrated as two bands and more rapidly than capsid proteins of the common and soybean strains in acrylamide gels containing sodium dodecyl sulfate. Host symptomatology, scrological assays, particle morphology, and gel electrophoresis of the mono-partite genome (6.4 kb) and whole virions demonstrated that TMV-S is closely related to the common strain of TMV but only distantly related to SHMV and TMV-B, which should be regarded as an SHMV isolate.