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

Yu-Min Yang
Qing-Yu Zhang
Jun Li
Hui-Ting Wei
Xiao-Rong Hu
Zheng-Song Peng
Wu-Yun Yang


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.

Key words: Aegilops tauschii, Triticum aestivum, introgression locus.