Characterization of New Wheat-Dasypyrum breviaristatum Introgression Lines with Superior Gene(s) for Spike Length and Stripe Rust Resistance.

<italic>Dasypyrum breviaristatum</italic> (genome VbVb) contains potentially important traits for commercial wheat production. Chromosome 2Vb of <italic>D. breviaristatum </italic>carries several desirable agronomic characters, including long spike length as well as enhanced resistance to stripe rust, which are expressed in a common wheat background. In this study, wheat-<italic>D. breviaristatum</italic> 2Vb deletion lines were produced and identified by fluorescence in situ hybridization (FISH), and 74 molecular markers specific to <italic>D. breviaristatum</italic> chromosome 2Vb were physically localized in 4 distinct chromosomal regions. New wheat-<italic>D. breviaristatum</italic> 2Vb translocation lines were also characterized by FISH. The breakpoint of the translocation T3AS.3AL-2VbS was determined by physically mapped molecular markers. Field evaluation revealed that genes affecting plant height and spike length are located on fraction length (FL) 0.65-1.00 of 2VbS, while the stripe rust resistance gene(s) are located on FL 0.40-1.00 of <italic>D. breviaristatum</italic> chromosome 2VbL. The newly characterized wheat-<italic>Dasypyrum</italic> chromosomal introgressions are of potential value for the improvement of the yield and disease resistance of wheat. [ABSTRACT FROM AUTHOR]