The use of resistance genes in wheat (Triticum aestivum L.) has historically been the most effective and efficient method to control the Hessian fly [Hf, Mayetiola destructor (Say)], one of the most destructive pests of wheat. To date, 30 Hf-resistance genes have been identified from Triticum species and Secale cereale. New resistance genes need to be identified and deployed for continuous success of the host resistance strategy since some resistance genes may be effective for only a few years due to the development of new Hf virulent biotypes. The Hf-resistance gene present in PI 94641, an accession of cultivated emmer wheat (AABB genomes, T. turgidum subsp. dicoccum) from Germany, has been transferred to the common wheat (AABBDD genomes), and the derived wheat germplasms were released as KS99WGRC42 and KS99WGRC43. Molecular mapping using microsatellite markers revealed that this gene is located in the distal region of the short arm of chromosome 1A. Two known Hf-resistance genes, H5 derived from the Portugal common wheat "Ribeiro" (PI 56206) and H11 from Portugal durum wheat PI 94587 (T. turgidum subsp. durum), are also located on chromosome 1A. Both H5 and H11 genes are resistant to biotype GP of the Hessian fly, but susceptible to biotype L. The newly identified gene present in PI 94641 and the derived KS99WGRC42 and KS99WGRC43 is resistant to both of the prevailing biotypes GP and L, indicating that this is a unique and new Hf-resistant gene.
Species 1: Diptera Cecidomyiidae Mayetiola destructor (Hessian fly)
Keywords: resistance gene, molecular mapping
Back to Display Presentations, Subsection Fa. Host Plant Resistance
Back to Posters
Back to The 2002 ESA Annual Meeting and Exhibition