小麦品种纹枯病抗性遗传的初步研究

A preliminary study on inheritance of the resistance to sharp eyespot in wheat

以病级为指标， 对 ４ 个杂交组合正反交 Ｆ１ 进行了抗病性调查， 发现正反交 Ｆ１ 之间无显著性差异， 表明纹枯病抗性遗传属于核遗传。同时调查 ５ 对杂交组合 Ｆ２ 群体的纹枯病抗性， Ｆ２ 植株比例都不符合质量性状的遗传特征。运用王建康和盖钧镒设计的主多基因混合遗传模型分离世代分析方法， 以及亲本、 Ｆ１ 和 Ｆ２ 方差分析方法， 分析 ５ 个杂交组合的纹枯病抗性遗传， 结果其至少受 １０～１３ 对主基因和一些微效多基因的共同控制， 且遗传率在 ３１６９％ ～５７０９％ 。

The inheritance of resistance to sharp eyespot in wheat was investigated.The result showed that no significant difference was found between F 1′s resistance in reciprocal cross by using t test,and the resistance was inherited through cell nucleus,without any effect from cytoplasm.Segregating ratios of plants in F 2 populations of five crosses indicated that the resistance was a quantitative not qualitative trait.By using single generation analysis based on major gene and ploygene mixed model provided by Wang and Gai(1997),and another method based on the variance of parents,F 1,F 2 to analyzed the data of five crosses,it could be concluded that there were at least 1 0 1 3 major genes with some polygenes controlling the inheritance of resistance,with broad heritability ranged from 31 69% to 59 09%.