小麦品种太空6号对Heterodera avenae郑州群体的抗性遗传分析

通过多年接虫和田间病圃抗性鉴定，发现普通小麦品种太空6号对燕麦孢囊线虫(Heterodera avenae)郑州群体具有较好的抗性。以抗病品种太空6号为父本、感病品种豫麦47为母本配置杂交组合构建遗传分离群体，通过田间病圃鉴定和室内接虫鉴定对太空6号进行了抗性遗传分析，发现豫麦47×太空6号杂种F₂代单株孢囊量为连续分布，具有数量性状特征；F₂代群体单株孢囊量分布图呈偏态分布，说明存在明显的主效基因。应用植物数量性状主基因+多基因混合遗传模型单个分离世代分析方法，分析豫麦47×太空6号杂种F₂代群体在室内接种二龄幼虫和田间病圃中对H. avenae郑州群体的抗性遗传效应均符合B-2模型，推测太空6号对H. avenae的抗性由2对主基因+多基因控制，主基因表现为加性-显性效应，在室内人工接种和田间病圃鉴定条件下主基因的遗传率分别为73.54%和86.90%，说明太空6号对燕麦孢囊线虫郑州群体的抗性是主效基因起主要作用。

Genetic Analysis of Common Wheat Cultivar Taikong 6 for Resistance to Heterodera avenae Zhengzhou Population

Taikong 6 is a common wheat (Triticum aestivum L.) cultivar with high-yield and good agronomic performance bred by Henan Academy of Agricultural Sciences with Satellite-loaded mutation breeding. This cultivar was shown to be resistant to H. avenaee Zhengzhou population in the conditions of repeated inoculation and field tests. In this study, Taikong 6 was crossed with the susceptible cultivarsYumai 47 to produce F₂ segregating population. Reactions of the F₂ progeny to H. avenaee Zhengzhou population was investigated in the field and inoculation tests. The results of genetic analysis showed that the cyst number of F₂ population was the quantitative character with a continuous and skewed distribution, indicating that there are major genes in Taikong 6. The method of joint segregation analysis of single generation of major gene plus polygene mixed inheritance model was used to analyze the inheritance of resistance to H. avenaee Zhengzhou population in Taikong 6, showing that the genetic model B-2 was the most fitted genetic model for the resistance for the cross of Yumai 47 × Taikong 6 in the conditions of inoculation and field tests. This indicates that the resistance to cereal cyst nematode in Taikong 6 is controlled by two major genes with additive-dominant effects plus polygene effect. The major gene heritability of resistance for the cross of Yumai 47 × Taikong 6 to H. avenaee Zhengzhou population in the conditions of inoculation and field tests was 73.54% and 86.90%, indicating the two major genes with the dominant role to resistance of Taikong 6 to H. avenaee Zhengzhou population.