Quantifying Aegilops tauschii Contributions to Wheat Performance

Project Summary:

Approximately half of the 2026 Texas A&M AgriLife advanced wheat breeding lines contain introgressions from Aegilops tauschii, derived either through direct introgression or via synthetic hexaploid wheat. The deliberate incorporation of Ae. tauschii germplasm was intendedto broaden the genetic diversity of the breeding program; however, all advancement decisions throughout the breeding pipeline were based strictly on agronomic performance rather than pedigree. This proposed research will address the question: Why do so many advancedbreeding lines retain Ae. tauschii introgressions in their pedigrees, and what contributionshave these introgressions made to line performance?
The overall goal of this work is to identify superior cultivar candidates and to trace agronomic performance, stress tolerance, and quality traits back to specific synthetic hexaploid sources. We will evaluate the contribution of primary synthetic hexaploid (PSH) wheat collections, “95 Elite” and “Elite 2,” obtained from the Wheat Genetics Resource Center. These PSHs were initially crossed with TAM 111 and TAM 112, and the resulting progeny have since been further crossed with multiple elite cultivars and experimental breeding lines. Our focus will be on derived lines that have successfully advanced through the breeding pipeline into advanced and elite yield trials.
Traits expressed in these synthetic derived elite lines (Syn-EL) include strong grain and forage yield potential, good bread-making quality, grazing tolerance, silage suitability, and drought resilience. Together with resistance to wheat curl mite, Hessian fly, greenbug, leaf rust, stripe rust, stem rust, and bacterial leaf streak, these lines collectively possess the full complement of traits required for adaptation to Great Plains hard winter wheat production systems.
These Syn-EL lines will be evaluated side by side in the same rainfed and irrigated field trials utilized by the Texas A&M AgriLife/TAM wheat breeding program. Depending on environmental conditions each year, we will generate reliable field data for grain yield, forage yield, drought tolerance, and resistance to key biotic stresses, including leaf rust, stripe rust, stem rust, wheat mosaic viruses, bacterial leaf streak, greenbug, and Hessian fly. Physiological traits will be measured, and UAS phenomic evaluations will be conducted to support trait dissection and breeding decisions.
By comparing trait-genome associations between founder lines and the Syn-EL lines, we will identify genomic regions associated with superior performance in elite germplasm.