【摘要】 以玉米南方型锈病免疫自交系P2 5和感病自交系F3 4 9及F1、F2 、B1和B2 为材料 ,采用主基因 多基因混合遗传模型研究了P2 5的抗病遗传规律。结果表明 :自交系P2 5的抗病基因为一主基因 ,表现为加性效应 ,没有检测出多基因 ,其在F2 、B1和B2 群体的遗传率分别为 81 88%、38 14 %和 5 5 1%。利用SSR分子标记技术 ,以组合P2 5×F3 4 9的F2 :3 家系作为构图群体 ,构建了玉米SSR遗传连锁图谱 ,并将玉米抗南方型锈病基因定位于 10号染色体上 ,与phi0 5 9标记的遗传距离为 5 8cM。更多还原

【Abstract】 Using P 25 （immune inbred line）,F 349 （susceptible inbred line） and the derived population F₁?F₂?B₁ and B₂ as materials,we investigated the heredity the of disease resistance gene to maize southern rust （ Puccinia polysora Underw.） through the major-gene and polygene inheritance model. The results indicate that a major resistance gene exists in the inbred line P 25 and expresses with additive effect.We didn’t find any multi-genes.The inheritabilities of this major resistant gene among F₂,B₁ and B₂ were 81.88%?38.14% and 55.1%,respectively.We constructed a maize SSR linkage map using P 25 ×F 349 F 2:3 population,and located the resistant gene on chromosome 10.The genetic distance between this gene and phi059 marker was 5.8 cM.更多还原