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New source of resistance to stripe rust in wheat landrace PI388060 originated from Punjab, Pakistan

Stripe rust is one of the devastating diseases with potential to affect wheat yield all over the world. It is essential to continuously identify novel causes of resistance and make them available for commercial use in wheat breeding. In current study, fifty wheat landraces were evaluated against eight stripe rust races from different areas of Pakistan at seedling stage and landrace PI 388060 was identified as resistant to all these stripe rust races. The line PI 388060 was crossed with Avocet ‘S’ to derive F2 and F3 progenies for analysis. Seedling and adult plant analysis of the F2 and F3 progeny revealed presence of one major gene in this line. Chi square analysis of the glasshouse data gave good fit to expected segregation ratio of 3:1. Family analysis of the randomly selected F3 lines and their field screening also revealed segregation of the lines in 3:1 ratio. Line #36 exhibited very good resistance in glass house against all the four stripe rust isolates and good resistant reaction in field with highest final rust severity of 10. PI 388060 seemed to be a significant source of resistance to stripe rust and further genetic analysis will be conducted to pinpoint new stripe rust resistant gene in this landrace. The lines from this cross are being raised to get advanced F7 population to further characterize the gene.