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CROP BREEDING & GENETICS

Introgression of a Strawbreaker Foot Rot Resistance Gene from Winter Wheat into Jointed Goatgrass

^a Dep. of Crop and Soil Science, Oregon State Univ., Corvallis, OR 97331-3002
^b Dep. of Plant, Soil, and Entomological Sciences, Univ. of Idaho, Moscow, ID 83844-2339

^* Corresponding author (perezjoa{at}oregonstate.edu)

Strawbreaker foot rot (SFR) [Pseudocercosporella herpotrichoides (Fron) Deighton] is a disease of winter wheat (Triticum aestivum L.) in many wheat growing regions in the world. Resistance to SFR can be conferred by a single dominant gene (Pch1) from Aegilops ventricosa Tausch that was transferred onto chromosome 7D of wheat. ‘Madsen’, a hexaploid winter bread wheat, carries Pch1 and is highly resistant to SFR. Jointed goatgrass (Ae. cylindrica Host.) 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 by Pch1 on 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 BC₂S₂ progeny that had only 20% infection. Madsen had 0% infection. The presence of Pch1 in the BC₂S₂ progeny 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.

Abbreviations: PNW, U.S. Pacific Northwest • SFR, strawbreaker foot rot