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A Second Gene for Resistance to Hessian Fly in Iumillo Durum Wheat

Dep. of Entomology
Dep. of Agronomy
USDA,ARS and Dep. of Entomology, Purdue Univ., West Lafayette, IN 47907

^* Corresponding author (hohom{at}dept.agry.purdue.edu).

Resistance to Hessian fly, Mayetiola destructor (Say), had been reported by other researchers to be transferred from the donor ‘Iumillo’ durum wheat (Triticum durum Desf.) to ‘Marquillo’ spring wheat (T. aestivum L.). We had observed that Iumillo demonstrated a higher proportion of resistant seedlings than Marquillo at temperatures of 21°C and above, and hypothesized that Iumillo may carry a gene(s) that conditions resistance to biotype L of Hessian fly in addition to H18 that had been transferred into Marquillo. Because Iumillo may carry more than one Hessian fly resistance gene, we examined the genetic basis of resistance to Hessian fly of Iumillo. Our objectives were to (i) determine the number of genes for resistance of Iumillo to Hessian fly biotype D at temperatures of 16, 21, 23, and 26°C, tested in a growth chamber, and (ii) determine if the resistance Iumillo to Hessian fly biotype D is inherited independently from H20. A second gene for resistance to Hessian fly biotype D, in addition to gene H18, was identified in Iumillo in backcross (BC) F₂ families. Gene H18 had previously been transferred from Iumillo to Marquillo. The second gene is inherited as a dominant or partially dominant, depending on temperature, gene independent of H18 and segregates independently of H20. Unlike H18, which is not effective above 20°C, this second gene of Iumillo is partially effective in the homozygous state at temperatures of 23 and 26°C.

Received for publication October 23, 1995.