Genetic Analysis of Stripe Rust Resistance at the Seedling Stage of New Winter Wheat Variety Longjian 9828
To determine the type and quantity of stripe rust resistance genes at the seedling stage of the new winter wheat variety Longjian 9828,and to provide support for the rational application of its disease resistance genes.In 2022,genetic analysis of stripe rust resistance was performed by inoculating seedlings of the wheat genetic population(Mingxian 169/Longjian 9828)F1,F2 single plants,and their parent materials with single spore isolates of CYR34,CYR32,and the new strain ZS of Pst.The results showed that Longjian 9828 exhibited moderate resistance to CYR34 and CYR32 of Pst,and high resistance to the new strain ZS,while Mingxian 169 was highly susceptible.After inoculating with CYR34 and CYR32,the F1 generation showed susceptibility,and the F2 generation showed a segregation ratio of 1R∶3S.After inoculating with the new strain ZS,the F1 generation showed resistance,and the F2 generation showed a segregation ratio of 3R∶1S.This indicates that the seedling stage stripe rust resistance of Longjian 9828 to CYR34 and CYR32 of Pst is controlled by one pair of recessive resistance genes,and the seedling stage disease resistance to the new strain ZS is controlled by one pair of dominant resistance genes.These results can provide a reference for the application of the new winter wheat variety Longjian 9828 in production and breeding.