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Genetics of Resistance of CI 15160 Durum Wheat to Biotype D of Hessian Fly

H. W. Ohm^*, F. L. Patterson, J. E. Foster and P. L. Taylor

Box 125, RR 3, Liberty, IN 47353
Dep. of Agronomy
Dep. of Entomology, Purdue Univ., West Lafayette, IN 47907-7899
Dep. of Entomology, Univ. of Nebraska, Lincoln, NE 68583

^* Corresponding author.

A genetic study was conducted using the durum wheat (Triticum durum Desf.) Cl 15160 because of its resistance to Biotypes C, D, E, and L of the Hessian fly, Mayetiola destructor (Say). This resistance to Biotypes E and L, currently prevalent in regions in the eastern USA, is potentially useful in the development of resistant cultivars. The objectives of this study were to determine the number of genes conferring resistance to Biotype D in Cl 15160, establish the allelic relationships or independence of these genes to 11 of the named genes that confer resistance to Biotype D, and determine the allelic relationship between the resistance genes in Cl 15160 and those in six durum introductions. A controlled environment chamber was used during infestation. Analyses of progeny rows from random selfed backcross plants, D6647*2/CI 15160, indicated that one, and possibly two genes, control resistance to Biotype D. One of these genes confers a high level of resistance expression, while the second gene may have a low degree of expression. These genes differ from the named genes H5 and H9 through H18 as determined by testcross analysis, but at least one gene may be linked to H16 and possibly H10. The resistance genes in CI 15160 also differ from those in five durum introductions, including H19. At least one gene, however, is either allelic or very tightly linked to a resistance gene in CI 15161. The highly expressed gene in Cl 15160 may be a useful new source of resistance to the Hessian fly.

Received for publication November 2, 1990.