西农979中长穗偃麦草（Thinopyrum ponticum）的遗传成分分析

西农979是我国黄淮麦区优质高产、早熟耐寒兼抗赤霉病的小麦新品种。十倍体长穗偃麦草（Thinopyrum ponticum）7E染色体携带有抗赤霉病和抗叶锈病等多种抗性基因。为明确西农979品种的遗传基础,以西农979及其主要供体亲本小偃6号、早优504、陕229、陕213和西农881为材料进行系谱分析,结果表明,西农979及其主要供体亲本陕229、陕213、西农881均为小偃6号的衍生系;小偃6号是十倍体长穗偃麦草的衍生系。在此基础上,利用十倍体长穗偃麦草7E染色体上106个特异分子标记进行分析,发现有6个标记在西农979和小偃6号中扩增出了十倍体长穗偃麦草的特异片段,西农979和小偃6号均携带有十倍体长穗偃麦草7E染色体短臂上分子标记Xwmc653-Xwmc809之间的75.10~77.46cM区段,标记Xcfd31-Xgwm350之间的86.16~87.32cM区段,以及7E染色体长臂标记Xmag1932-Xdauk144之间的147.71~149.51cM区段。结果表明,西农979携带的十倍体长穗偃麦草7E染色体上的遗传物质源自小偃6号,这为进一步研究和利用西农979提供了理论参考。

Genetic Relationship of Xinong 979 and Thinopyrum ponticum Based on Pedigree Analysis and Molecular Markers

Xinong 979 is a famous facultative cultivar with improved quality, high yield potential, and multi-resistance to various diseases, and has been widely extended in the southern Huanghuai Wheat Zone in China. Chromosome 7E of Thinopyrum ponticum carries Fusarium head blight (FHB) resistance gene (Fhb7), leaf rust resistance gene (Lr19) and stem rust resistance gene (Sr25). In this study, the pedigree and 7E chromosome molecular marker of Th. ponticum were used to analyze the genetic relationship among Xinong 979 and its 5 donor parents (Xiaoyan 6, Zaoyou 504, Shaan 229, Shaan 213, and Xinong 881), and Th. Ponticum. Pedigree analysis showed that the Xinong 979, Shaan 229, Shaan 213, and Xinong 881 were all derived from Xiaoyan 6. Xiaoyan 6 was a derivative from Th. ponticum. Six of 106 specific molecular markers of Th. ponticum chromosome 7E showed specific bands of Th. ponticum in Xinong 979 and Xiaoyan 6. Markers of Xwmc653 and Xwmc809 were located on 7ES 75.10-77.46cM; and Xcfd31 and Xgwm350 were located on 7ES 86.16-87.32cM; and Xmag1932 and Xdauk144 were located on 7EL 147.71-149.51cM. The results showed that Xinong 979 was a derivative from Xiaoyan 6. The study provides a reference for further research and utilization of Xinong 979.