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Wheat stripe rust, caused by Puccinia striiformis Eriks. f. sp. tritici, is a destructive wheat disease worldwide. To find new sources of resistance, Guinong 775 wheat was previously bred and identified as having a strong resistance against stripe rust, powdery mild and leaf rust. Guinong 775 showed a strong resistance against mixed fungi (CYR32 and CH42) associated with stripe rust that are common in Guiyang and Qianxinan. It was crossed with the susceptible wheat line Huixianhong to develop F1, F2 and F3 hybrids. In this study, 173 simple sequence repeat markers were used to map the stripe rust resistance gene in Guinong 775, and the resistance phenotype of Guinong 775 was regulated by a single dominant gene named YrGn775. YrGn775 was mapped to chromosome 1BS with the marker Xgwm413 flanking the gene at a distance of 12.0 cM. Genetic and molecular marker analyses demonstrated that this dominant gene may have originated in Aegilops ventricosa. Thus YrGn775 may be a novel gene in wheat.

Mapping the stripe rust resistance gene in Chinese wheat Guinong 775