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

Abstract

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 cultivars Yumai 47 to produce an F 2 segregating population. Reactions of the F 2 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 F 2 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.