小麦纹枯病抗性的主基因+多基因遗传分析  

Genetic Analysis of Sharp Eyespot Resistance by Using Major Gene Plus Polygene Mixed Inheritance Analysis in Wheat (Triticum aestivum)

作　　者：吴纪中[1] 颜伟[1] 蔡士宾[1] 任丽娟[2] 汤颋[2] 

机构地区：[1]江苏省农业科学院粮食作物研究所,江苏南京210014 [2]江苏省农业科学院农业生物遗传生理研究所,江苏南京210014

出　　处：《江苏农业学报》2005年第1期6-11,共6页Jiangsu Journal of Agricultural Sciences

基　　金：国家"十五"科技攻关项目 (2001BA511B03);江苏省自然科学基金项目(BK2004170)

摘　　要：以病情指数为指标,利用牙签接菌法对ARZ×扬麦 158衍生的F6 代重组自交系群体 (RIL)进行纹枯病抗性评价,并采用植物数量性状主基因+多基因混合遗传模型分离分析法,研究该群体抗纹枯病基因的遗传规律。结果表明,这一群体中小麦纹枯病的抗性符合两对连锁主基因遗传模型(B 2 1),主基因间表现为加性 加性×加性上位性作用,重组率为 0 178 7。在两对主基因中,效应较大的 1对加性效应为 10 10%,效应较小的 1对加性效应为 2 32%,两对主基因的遗传率中等偏高,为 72 31%。提示抗纹枯病育种应重视主基因的利用。Sharp eyespot caused by Rhizoctonia cerealis is a widespread wheat disease and has resulted in severe yield and quality losses. Developing resistant varieties is an efficient solution to control the disease. Unfortunately, the inheritance of resistance to sharp eyespot is still poorly understood. This study was conducted to elucidate the inheritance of resistance to sharp eyespot in a population of F_6-derived recombinant inbred lines (RILs) from a cross of AR_Z (resistant)×Yangmai 158 (susceptible) by using the major gene plus polygene mixed inheritance model. Response of the RILs and their parents to R. cerealis infection was evaluated in field trial by inoculating R. cerealis with cultured short toothpicks. The results indicated that two linkage major genes with additive-additive×additive epistatic effect (Model B-2-1) governed the inheritance of resistance to sharp eyespot in the RILs. The recombinant rate between the two major genes was about (0.178 7.) These two major genes showed different additive effects. One was about 10.10% and the other 2.32%. The heritability of the major genes was about 72.31%.

关 键 词：主基因 小麦纹枯病 遗传模型 加性效应 抗性 接菌 群体 多基因遗传 AR 分离分析 

分 类 号：S435[农业科学—农业昆虫与害虫防治] S511[农业科学—植物保护]