Submitted to: Agricultural Experiment Station Publication
Publication Type: Experiment Station
Publication Acceptance Date: 11/30/2017
Publication Date: 2/1/2018
Citation: Xu, X. 2018. Pest resistance discovery and introgression. In: Partners and Progress - Wheat Research at OSU, 2017. Oklahoma Agricultural Experiment Station. P-1050, p. 13-15.
Technical Abstract: Russian wheat aphid (RWA), greenbug, and bird cherry-oat aphid (BCOA) are major wheat pests in the USA, while powdery mildew is an important wheat disease causing serious yield losses in the Great Plains. Identification of resistance sources/genes is of agronomic importance. Wheat landraces Osiris and Ghund Hosa likely confer resistance to BCOA, and crosses were made to transfer the potential resistance gene to adapted germplasm. Three biotic resistance genes, including GB595379, Dn10 and Pm59, were identified. Gb595379, a novel greenbug resistance gene conferring broad resistance to greenbug biotypes, was identified in a reselection line PI 595379-1 and mapped to the long arm of chromosome 7D. Dn10 is a Russian wheat aphid resistance gene identified in PI 626580 and mapped to chromosome 7DL. Dn10 confers resistance to RWA biotype 2, and can be used in wheat breeding to replace the rye-derived Dn7 gene, which is currently present in Oklahoma germplasm but associated with undesirable end-use quality. Pm59 was discovered in PI 181356 and mapped to the terminal region of chromosome 7AL. Pm59 confers resistance to powdery mildew isolates collected from the Great Plains and the state of Montana, and can be used to breed powdery mildew-resistant cultivars in Oklahoma.