花生晚斑病抗性遗传分离分析

选用高抗晚斑病种质ICGV86699与高感花生品种中花5号作亲本构建重组近交系XA-RIL群体,采用植物数量性状主基因+多基因混合遗传模型分析晚斑病抗性的遗传特性。结果表明,XA-RIL群体家系间晚斑病抗性差异极显著,抗性受2对加性-上位性主基因+加性-上位性多基因控制,主基因遗传率为60.10%~86.61%,微效多基因遗传率为6.65%~32.77%。相关分析表明,晚斑病抗性与晚熟、结果数少、小籽粒等性状连锁。鉴定出家系XA006为一个综合农艺性状优良的高产、高抗晚斑病材料。

Segregation analysis of resistance to late leaf spot in peanut

 A highly resistant germplasm ICGV86699 and a highly susceptible cultivar Zhonghua 5 were used as parents to build a recombined inbred lines population (XA-RILs). The genetic characteristics of resistance to late leaf spot (LLS) in peanut were studied based on the segregation analysis of genetic system of quantitative traits. The results showed that LLS resistance among XA-RILs was significantly different and the resistance was controlled by two additive-epistatic major genes and additive-epistatic polygenes. The heritabilities of main genes were 60.10%-86.61% while the heritabilities of polygenes were 6.65%-32.77%. The correlation analysis verified that resistance to LLS was linked with some poor agronomic traits such as late maturity, low yield and small seed. From XA-RILs, an elite line, XA006, was selected as a breeding line possessing high yield and resistance to LLS with other desirable agronomical traits.