Detection of the introgression loci in Triticum aestivum transferred from Aegilops tauschii by simple sequence repeat (SSR) markers

摘要

Aegilops tauschii?possesses many valuable traits or genes. The introgression loci transferred from?A. tauschii?in populations of 64 lines of BC1F2?and 147 advanced lines of BC1F2-F7?derived from the cross of Chinese Spring (CS;?Triticum aestivum) /SQ-214 (A. tauschii)?//SW3243 (T. aestivum) was characterized using simple sequence repeat (SSR) markers. 68 polymorphic loci covering the D genome were used to analyze the distribution of?A. tauschii?SQ-214 introgression loci in the two derived populations. The result shows that 82.35% loci of?A. tauschii?SQ-214 were detected in BC1F2?population,?while the frequency of introgression loci was 51.47% in the advanced lines of BC1F2-F7?after artificial selection?for stripe rust resistance and agronomic traits. Significant changes of the distribution frequency for the same introgression loci between BC1F2?and BC1F2-F7?populations were observed, and seven selective advantage loci from?A. tauschii?(Xgdm128-3D, Xgdm8-3D, Xgdm72-3D, Xgwm341-3D, Xgdm63-5D, Xgdm132-6D and Xgdm36-6D) were found, which introgression loci distribution frequency increased from 29.69 to 53.91% (BC1F2) to 94.22 to 100% (BC1F2-F7). The selective advantage loci could be used to evaluate the desirable genes or traits derived from?A. tauschii?SQ-214.