The greenbug, Schizaphis graminum (Rhodani) is one of the major pests of wheat worldwide. The efficient utilization of wheat genes expressing resistance to greenbug infestation is highly dependent on an understanding of gene interrelationships and will be further facilitated through the use of molecular markers linked to resistance genes. The present study involved several F2 wheat populations derived from crosses between susceptible cultivars and resistant germplasm carrying different greenbug resistance genes. These populations were used to characterize the inheritance of a wheat gene (Gbx) conferring tolerance to the greenbug biotype I, to identify molecular markers linked to Gbx, and to investigate the allelic relationship between Gbx and Gb3. Our results indicated that Gbx is inherited as a single dominant gene, which is linked to the microsatellite markers Xbarc53 and Xgwm428 at map distances of 4.6 and 5.7 cM, respectively, in the distal region of the long arm of the wheat chromosome 7D. Gbx is either allelic or closely linked to Gb3.
Species 1: Homoptera Aphididae Schizaphis graminum (greenbug)
Keywords: wheat, genetic markers
Back to Student Competition Display Presentations, Section Fa. Host Plant Resistance
Back to Student Competition Posters
Back to The 2003 ESA Annual Meeting and Exhibition