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Genetics of Resistance of PI 422297 Durum Wheat to the Hessian Fly

Dep. of Agronomy, IAV Hassan II, BP6202 Rabat/Inst., Morocco
Dep. of Agronomy
USDA-ARS, Dep. of Entomology
Dep. of Agronomy, Purdue Univ., West Lafayette, IN 47907

^* Corresponding author.

The durum wheat (Triticum durum Desf.) PI 422297 was selected for genetic studies because of its resistance to Biotypes B, C, D, and L of the Hessian fly, Mayetiola destructor (Say). The objectives of this study were to determine the number of genes controlling the resistance of PI 422297 to Biotype D, and to establish the allelic relationships or independence of these genes to currently known genes that confer resistance against this biotype. This experiment was conducted in a controlled environment chamber maintained at 19 ± 2 °C. In testcross analyses, random selfed BC progeny rows between the susceptible parent D6647 and PI 422297 indicated that two genes controlled the expression of this resistance; these two genes are independent of H5, H9, H10, H14, H15, and H17. No fully susceptible progeny rows were observed in the crosses involving H11 and H16 together, or H16 singly, with the two genes in PI 422297. However, the level of resistance of the PI 422297 genes at 26 °C indicates that a linkage or allelic relationship is involved between one gene in PI 422297 and H16. Therefore, one of the two genes in PI 422297 is different from all previously known genes for resistance to Biotype D. We designate this gene as H19. The other gene is associated with H16. Additional research is planned to determine whether the second gene of PI 422297 that confers resistance to biotype D of Hessian fly is allelic or linked to H16.

Received for publication November 2, 1987.