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Expression and Inheritance of Resistance of ELS 6404-160 Durum Wheat to Hessian Fly

Plant Science Res., R.R. 1, Box 30, Boswell, IN 47921
Dep. of Agronomy
ARS-USDA and Dep. of Entomology
Dep. of Agronomy, Purdue Univ., West Lafayette, IN 47907

^* Corresponding author.

ELS 6404-160, CI17647, a durum wheat (Triticum durum Desf.) introduction from Ethiopia, was found resistant to several biotypes of Hessian fly [Mayetiola destructor (Say)]. Additional genes for resistance are needed for breeding wheat for resistance to the Hessian fly. Research was conducted on a random plant (designated as Selection 5) of ELS 6404-160. Our objectives were to determine (i) the number of genes in ELS 6404-160-5 controlling resistance to biotypes B and D, (ii) if the gene(s) are different from known genes effective against biotypes B, D, and L, (iii) the pattern of resistance of ELS 6404-160-5 to biotypes B, C, D, and L, and (iv) the effectiveness of the resistance at three temperature regimes. Test cross progeny and F₃ line analyses, conducted in greenhouses or growth chambers, indicated that ELS 6404-160-5 has two genes for resistance which are different from other genes known to provide resistance to biotypes D and L. Segregation of test cross progeny rows in a three segregating to one susceptible ratio following the test cross of ELS 6404-160-5 with susceptible D6647 indicated that resistance was governed by two genes. The occurrence of susceptible test cross progenies in test crosses following crosses of ELS 6404-160- 5 with genotypes with known genes for resistance to biotype D indicated that the genes in ELS 6404-160-5 were different than those previously described. ELS 6404-160-5 is resistant to biotypes B, C, D, and L and resistance is quite stable to biotype D at three temperatures. The genes from ELS 6404-160-5 are designated H14 and H15. Gene H15 is closely associated with H9 on chromosome 5A; H14 may be linked to or independent of H10, which is on chromosome 5A.

Received for publication June 4, 1987.