Inheritance of Resistance To Heterodera Avenae in Barley

Inheritance of resistance to H. avenae in four cultivars of barley, Athinais, CI 8147, Marocaine 079 and Nile, was attributed to a single dominant gene. In a fifth cultivar, Morocco, the resistance may have been due to a single dominant gene but the possibility of two genes involved in the resistance could not be discounted. The same gene was involved in the resistance of Athinais and Marocaine 079, different genes were involved in Athinais and Nile, while both of these genes differed from the resistance in Morocco. Resistance in CI 8147 also differed from Morocco, but the relation of this gene to genes in other cultivars is not known. Therefore, at least three, with a possibility of five, different major genes were involved in the expression of resistance to H. avenae by the barley cultivars used in this test.