Introgression of a Strawbreaker Foot Rot Resistance Gene from Winter Wheat into Jointed Goatgrass
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Strawbreaker foot rot (SFR) [Pseudocercosporella herpotrichoides(Fron) Deighton] is a disease of winter wheat (Triticum aestivumL.) in many wheat growing regions in the world. Resistance to SFR can be conferred by a single dominant gene (Pch1) fromAegilops ventricosaTausch that was transferred onto chromosome 7D of wheat. Madsen, a hexaploid winter bread wheat, carriesPch1and is highly resistant to SFR. Jointed goatgrass (Ae. cylindricaHost.) is a winter annual grass weed. Wheat and jointed goatgrass have the D genome in common and have been found to hybridize and backcross under field conditions. Since SFR resistance in winter wheat is controlled byPch1on the D genome, it is theoretically possible for resistance to be transferred to jointed goatgrass via backcrossing. A SFR resistant jointed goatgrass population would potentially have an ecological advantage in the presence of the disease. To evaluate the likelihood of gene introgression, Madsen, Stephens (a SFR susceptible winter wheat), three jointed goatgrass accessions, and 15 artificially produced backcross progenies (BC2S2) were inoculated with SFR. The percentage of infection in Stephens, the joined goatgrass accessions, and the backcross progenies was 80% or greater except for one BC2S2progeny that had only 20% infection. Madsen had 0% infection. The presence ofPch1in the BC2S2progeny was confirmed using a biochemical marker linked to the resistance gene. These results show that a SFR resistance gene from winter wheat can be transferred to jointed goatgrass.
