Abstract: In order to study the genetic rule of resistance to stripe rust in Qinghai spring wheat cultivar Gaoyuan 363, Qinghai spring wheat adult stage stripe rust resistance cultivar Gaoyuan 363 was crossed with the susceptible spring wheat cultivar Taichung 29 (T29) to produce the F_2:3 segregating populations. The stripe rust resistance was identified separately in Xining and Huzhu for two years. The inheritance effects of stripe rust resistance in Gaoyuan 363/T29 F₂ populations was analyzed by the method of single generation of joint segregation analysis using mixed inheritance model of major gene plus polygene. Frequency distributions results of Gaoyuan 363/T29 F_2:3 populations the infection type and disease severity data showed that:tested on two places, Xining and Huzhu, and in two years for Gaoyuan 363/T29 F_2:3 populations, the disease severity and infection type presented a bimodal distribution, which was uncontinuous, but was continuous in some parts. It preliminarily indicated that stripe rust resistance of Gaoyuan 363 was jointly controlled by major gene and minor genes; the result of inheritance model analysis showed that, for Gaoyuan 363 tested in both environments, whether using the disease severity or the infection type data, the most fitted genetic model for stripe rust resistance was controlled by two major genes and partially by minor genes, and the two major gene interactions (C-1:2MG-ADI additive-major-epistatic interaction,C-5:2MG-AED complete dominance effect,C-6:2MG-EEAD equal dominance effect) were different.

Key words: Spring wheat, Gaoyuan 363, Stripe rust resistance, Inheritance model

CLC Number: 

• S435.121