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1 August 2000 Efficacy of Pyramiding Greenbug (Homoptera: Aphididae) Resistance Genes in Wheat
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Abstract

Durable resistance to greenbug, Schizaphis graminum (Rondani), in wheat is a goal of wheat improvement teams, and one that has been complicated by the regular occurrence of damaging biotypes. Simulation modeling studies suggest that pyramiding resistance genes, i.e., combining more than one resistance gene in a single cultivar or hybrid, may provide more durable resistance than sequential releases of single genes. We examined this theory by pyramiding resistance genes in wheat and testing a series of greenbug biotypes. Resistance genes Gb2, Gb3, and Gb6, and pyramided genes Gb2/Gb3, Gb2/Gb6, and Gb3/Gb6 were tested for effectiveness against biotypes E, F, G, H, and I. By comparing reactions of plants with pyramided genes to those with single resistance genes, we found that pyramiding provided no additional protection over that conferred by the single resistance genes. Based on the results of this test, we concluded that the sequential release of single resistance genes, combined with careful monitoring of greenbug population biotypes, is the most effective gene deployment strategy for greenbug resistance in wheat.

David R. Porter, John D. Burd, Kevin A. Shufran, and James A. Webster "Efficacy of Pyramiding Greenbug (Homoptera: Aphididae) Resistance Genes in Wheat," Journal of Economic Entomology 93(4), 1315-1318, (1 August 2000). https://doi.org/10.1603/0022-0493-93.4.1315
Received: 6 July 1999; Accepted: 1 May 2000; Published: 1 August 2000
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