Abstract
Seven lines of Avena sterilis L. were compared to one of A. sativa L. as sources of resistance to the barley yellow dwarf virus (BYDV), in crosses with the susceptible A. sativa ‘Lamar’ on the basis of visual symptoms under conditions of artificial virus inoculation in the field. Additive gene action explained most of the genetic variability observed, and heritability estimates were generally high. According to East's formula, four or fewer segregating factors were involved, so the classification of plants on a symptom basis was tested against simple genetic models. Three simple models explained the variation observed in the F2 generation of four crosses. Two crosses conformed to a model with one dominant and three additive resistance genes, and the other two fit models with only two and three additive genes, respectively.
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