Inheritance of resistance to wheat yellow rust at adult plant stage

Abstract

In order to investigate on inheritance and gene action for resistance to yellow rust, the resistant line C.B227 was crossed with the susceptible variety Avocet. Parents (P1 and P2) and the resulting F1, F2 and F3 generations were planted in a randomised complete block design with two replications in the field. The plants were inoculated with 70E0A⁺ pathotype of yellow rust in the research station of Gharakhil, Iran, and evaluated for resistance at adult plant stage. Disease severity and infection type of flag leaf were recorded for each single plant and final coefficient of infection was calculated. The results of weighted ANOVA indicated that the difference among the generations was significant (p < 0.01) for the trait final infection type. Generation mean analysis showed that dominant effect was more important than additive one. The degree of dominance indicated the presence of complete dominance. Additive, dominance and epistasic additive × additive [i] effects were important in genetic control of resistance. The results of generation variance analysis were consistent with generation mean analysis.

Keywords:

• wheat
• yellow rust
• generation mean analysis
• generation variance analysis

Acknowledgement

We herewith acknowledge the Research Station of Gharakhil that assisted and provided us with the required facilities to conduct this research. Also, we thank our respectful colleagues who assisted us in the stations of Gharakhil for recording the results in farms.