Expression and Inheritance of Resistance of ‘Marquillo’ Wheat to Hessian Fly Biotype D1

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Abstract
Resistance of ‘Marquillo’ wheat (Triticum aestivum L.) to the Hessian fly [Mayetiola destructor (Say)] has been used effectively wheat cultivars for more than 30 yrs. Previous analyses of the genetic basis for resistance have been inconclusive. Our objectives were to determine the optimum temperature for expression of the Marquillo resistance in seedlings, to determine the number of genes controlling resistance to biotype D of Hessian fly, and to determine the relation of the Marquillo gene to other genes for resistance. We used biotype D of Hessian fly and standard methods of analysis of resistance of seedling progenies. The Marquillo resistance was expressed most consistently at 16°C. One partially dominant gene controlled resistance at this. temperature in crosses of Marquillo by susceptible cultivars. The Marquillo resistance appeared to be inherited independently from the H12 resistance in the F2 plant progenies of Marquillo/ Luso crosses. Known dominance and genomic relationships imply that the Marquillo gene is distinct from all other known genes for resistance to biotype D of the Hessian fly.

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