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Inheritance of Resistance to Seed Transmission of Barley Stripe Mosaic Virus in Barley. T. W. Carroll, Professor, Department of Plant Pathology, Montana State University, Bozeman, MT 59717; P. L. Gossel(2), and E. A. Hockett(3). (2)Former laboratory technician, Department of Plant Pathology, Montana State University, Bozeman, MT 59717; (3)Research agronomist, U.S. Department of Agriculture, Science and Education Administration, Agricultural Research, Department of Plant and Soil Science, Montana State University. Phytopathology 69:431-433. Accepted for publication 25 October 1978. This article is in the public domain and not copyrightable. It may be freely reprinted with customary crediting of the source. The American Phytopathological Society, 1979. DOI: 10.1094/Phyto-69-431.

A single recessive gene conditions resistance to seed transmission of barley stripe mosaic virus (BSMV) in barley (Hordeum vulgare L.). Among the progenies of crosses of Modjo (resistant) and Vantage (susceptible) barleys infected with the Montana isolate three (MI-3) of BSMV, susceptible F₁ and F₂ seedlings segregated 1 resistant to 3 susceptible plants. Data from F₃ families were used to determine F₂ genotypes, because the low levels of seed transmission were difficult to detect in some of the hetrozygous susceptible plants of the F₂ generation. Frequency of seed transmission by infected homozygous susceptible plants of Vantage (barley) was about 70–80%, indicating that the gene governing susceptibility to seed transmission had a penetrance of 70–80%. Variable expressivity also was associated with this gene since infected seedlings expressed symptoms of variable severity at different growth stages. During this study, the virus was presumed to be genetically stable with respect to seed transmissibility.