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Published in Crop Sci 24:337-340 (1984)
© 1984 Crop Science Society of America
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Genetic Analysis of Resistance to Barley Yellow Dwarf Virus in Hybrids between Avena sativa ‘Lamar’ and Virus-Resistant Lines of Avena sterilis1

B. Landry, A. Comeau, F. Minvielle and C.-A. St-Pierre2

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.

Key Words: Interspecific hybridization • Heritability • Resistance genes

1 Contribution from Faculté des Sciences de l'Agriculture et de l'Alimentation, Université Laval, and contribution no. 205 from the Research Station, Agriculture Canada, Ste-Foy, Québec, Canada. This work was part of a M.Sc. thesis by the senior author.

2 Respectively graduate student at plant science, Davis, California 95616, research scientist at Research Station, Agriculture Canada, Ste-Foy G1V 2J3, professor of animal genetics and professor of plant breeding at Université Laval, Québec, Canada, G1K 7P4.

Received for publication October 18, 1982.




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