Phenotypic and Ionome Profiling of Triticum aestivum x Aegilops tauschii Introgression Lines

作者：Jaradat Abdullah A

来源：Crop Science, 2017, 57(4): 1916-1934.

DOI：10.2135/cropsci2016.09.0797

Eighty-five single homozygous introgressions of the Aegilops tauschii D genome in the cultivar Chinese Spring hexaploid wheat (Triticum aestivum L.) genetic background were used to study phenotypic and ionome profiles during 2 yr 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 substitution lines ranged from low (e.g., 28.6% for the ionome) to large (e.g., 78.6% for seed area). The large (> 60.0%) significant differences between substitution lines in grain crude protein, spike harvest index, and spike fertility index estimates are of value for wheat agronomic improvement. Differences among substitution lines accounted for 63.8 and 67.7% 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 Chines Spring (81.0%) as compared to 83.7% (6D) to 96.0% (4D) for introgression lines. Plasticity can be deduced from the ionome's phenotypic (28.6%) and genotypic (27.9%) coefficients of variation, and heritability estimate (41.5%). Most substitution lines exhibited high genetic potential for increasing grain micronutrient concentrations, especially Fe and Zn by 12.0 and 8.0%, respectively, above Chinese Spring as a model bread wheat cultivar; however, their genetic drag on grain yield is yet to be determined.

• 出版日期2017-8