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为明确小麦农家种红蚰麦抗白粉病的遗传基础,对红蚰麦和豫麦13的杂交F2代群体进行了遗传分析,结果表明红蚰麦携带1对显性的抗白粉病基因(暂命名为Pmhym)。利用SSR标记和F2代分离群体分组分析法,将该基因定位在7B染色体的长臂上,与3个微卫星标记Xwmc232、Xgwm577和Xwmc526连锁,遗传距离分别是14.3、25.6和57.2cM。分子标记分析表明该基因不同于已有被定位在7BL上的Pm5系列复等位基因,因而推测Pmhym是1个新的抗白粉病基因。上述结果将为开展Pmhym基因的精细定位奠定基础。
In order to clarify the genetic basis of resistance to powdery mildew in wheat cultivars, the F2 population of F2 generation of red mulberry and Yumai13 were analyzed. The results showed that the red mulberry wheat had one dominant dominant powdery mildew resistance gene Named Pmhym). The SSR marker and F2 segregation population segregant analysis were used to locate the gene on the long arm of chromosome 7B and linked to three microsatellite markers Xwmc232, Xgwm577 and Xwmc526 with genetic distances of 14.3, 25.6 and 57.2 cM, respectively. Molecular marker analysis showed that this gene was different from the Pm5 series multiple alleles that have been mapped on 7BL. Therefore, Pmhym was speculated to be a new powdery mildew resistance gene. These results will lay the foundation for the fine mapping of Pmhym gene.