Location: Soil Management ResearchTitle: Introgression lines of Triticum aestivum x Aegilops tauschii: Agronomic and nutritional value
Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: 1/17/2018
Publication Date: N/A
Technical Abstract: Eighty-five single homozygous substitution lines (SLs) of the Aegilops tauschii D genome in Chinese Spring (CS) hexaploid wheat (Triticum aestivum L.) genetic background were evaluated for agronomic, phenotypic and ionome profiles during three years of field experiments. An augmented design with a repeated bread wheat check was implemented to adjust for spatial soil variability. Percent significant pairwise differences between SLs was large for kernel phynotypic traits (78.6%) and small for the ionome (28.6%). Agronomic traits (spike harvest index, and spike fertility index) and protein content displayed large (>60.0%) significant differences between SLs. Differences among SLs accounted for 63.8 and 67.7% of variation in macro- and micronutrient concentration in kernels, respectively; and caused significant differences between macro- and micronutrients as to their functional relationships in leaves and grains; the latter showed more positive responses than the former. The ionome validation variance was smallest for CS (81.0%) as compared to 83.7% (6D) to 96.0% (4D) for SLs. Plasticity can be deduced from the ionome’s phenotypic (28.6%) and genotypic (27.9%) coefficients of variation, and heritability estimate (41.5%). Most SLs exhibited high genetic potential for increasing grain micronutrient concentrations, especially Fe and Zn, by 12.0 and 8.0%, respectively, above CS as a model bread wheat cultivar. A small fraction (18%) of SLs showed yield drag compared to CS; whereas, 63% had grain yield within ±5% of CS, and the remaining 19% had significantly larger grain yield than CS. These SLs are expected to broaden the wheat genetic base to improve nutritional and agronomic traits.