Inheritance of Resistance to Seed Transmission of Barley Stripe Mosaic Virus in Barley

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Abstract
A single recessive gene conditions resistance to seed transmission of barley stripe mosaic virus (BSMV) in barley (H. vulgare L.). Among the progenies of crosses of ''Modjo'' (resistant) and ''Vantage'' (susceptible) barleys infected with the Montana [USA] 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 heterozygous susceptible plants of the F2. 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.

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