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Inheritance of Resistance of PI 94587 Wheat to Biotypes B and D of Hessian Fly¹

The resistance of PI 94587 wheat (Triticum turgidum L. durum group) to biotype D of Hessian fly [Mayetiola destructor (Say)] was studied at the tetraploid and hexaploid chromosome levels and to biotype B of Hessian fly at the tetraploid chromosome level. Progenies of selfed BC₁ or testcross plants were infested with biotypes B or D of Hessian fly at 20 ± 2 C. Chi-square goodness-of-fit tests were used to test genetic hypotheses. Recombination frequencies and standard errors were determined using the maximum likelihood method.Test cross analysis of the resistance of PI 94587 to biotype D of Hessian fly strongly suggests two independent dominant genes. Test cross plant progenies susceptible to biotype D of Hessian fly were retested to biotype B of Hessian fly using reserve seed. It was probable that two genes (one in addition to the H6 gene) or three were segregating in the test cross progenies. Thus, PI 94587 may have four or five independent dominant genes for resistance to the Hessian fly. Three common wheat selections resistant to biotype D of Hessian fly were derived from crosses between cultivar ‘Riley’ or Purdue breeding line 5724B3-5P-8-2 and PI 94587. They are selections 916, 920 and 941. All three selections have a common dominant gene for resistance from PI 94587. This gene was linked 4.40 ± 1.78 map units from the H5 gene in ‘Abe’ wheat and was designated H11.

Key Words: Host plant resistance • Insect resistance • Triticum aestivum L. em. Thell. • Plant breeding • Mayetiola destructor (Say)

² Former graduate research assistant (now post-doctorate fellow in medical genetics, Indiana Medical School, Indianapolis, Ind.); professor of agronomy; and research entomologist, USDA-ARS, and professor of entomology, Purdue Univ., respectively.

Received for publication December 18, 1981.