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以小麦－中间偃麦草异附加系Ｌ１作抗源选育而成的抗黄矮病小麦新品系Ｙｗ６４２、Ｙｗ４４３、Ｙｗ２４３、Ｙ９８０７０４，其抗性来自中间偃麦草染色体７Ｘ。利用Ｙｗ６４２×中８６０１的Ｆ２分离群体，对由易位系Ｙｗ６４２筛选出的ＲＦＬＰ标记进行连锁分析，确定了ＲＦＬＰ标记ｐｓｒ６８７和ｗｇ３８０分别与７ＸＬ上的ＢＹＤＶ抗性基因共分离。利用上述２个ＲＦＬＰ标记，对具有不同遗传背景的抗病易位系Ｙｗ４４３、Ｙｗ２４３、Ｙ９８０７０４等进行了Ｓｏｕｔｈｅｒｎ分析。结果表明，这些抗病系均具有７ＸＬ的抗病特异带，缺失小麦７ＤＬ特征带，说明这些抗病系是小麦－中间偃麦草７ＤＳ·７ＤＬ－７ＸＬ易位系，ｐｓｒ６８７和ｗｇ３８０可应用于分子标记辅助育种。
Resistance to yellow dwarf wheat Yw642, Yw443, Yw243, Y980704, derived from the wheat-Thinopyrum alopecuroiocarysi L1 strain for resistance breeding, was derived from chromosome 7X of Thinopyrum intermedium. The RFLP markers screened by the translocation line Yw642 were analyzed by linkage analysis using F2 segregating population of Y6064 × 8601 to determine that RFLP markers psr687 and wg380 were co-segregated with BYDV resistance genes on 7XL, respectively. Southern blot analysis of Yw443, Yw243, Y980704 and other disease-resistant translocation lines with different genetic backgrounds was conducted by using the above two RFLP markers. The results showed that all the resistant lines had 7XL resistance-specific bands, which lacks the 7DL characteristic bands of wheat, indicating that these resistant lines are the wheat-Thinopyrum intermedium 7DS.7DL-7XL translocation line. Psr687 and wg380 can be applied to molecular markers Assisted breeding.