Transfer of the high-temperature adult-plant stripe rust resistance gene Yr62 in four Chinese wheat cultivars

Abstract

Abstract Wheat stripe rust is one of the diseases that seriously affect wheat production worldwide. Breeding resistant cultivars is an effective measure to control this disease. The wheat stripe rust resistance gene Yr62 has high-temperature adult-plant resistance (HTAP). In this study, PI 660060, a single gene line containing Yr62, was crossed with four Chinese wheat cultivars, namely, LunXuan987 (LX987), Bainongaikang58 (AK58), ZhengMai9023 (ZM9023) and HanMai6172 (H6172). F1 seeds of four cross combinations were harvested and self-crossed in the field. Then 33 lines with good agronomic traits and high disease resistance were screened in the F9 generation. SSR markers Xgwm251 and Xgwm192 flank linked with the Yr62 were used to detect the presence of Yr62 in these 33 F9 lines. Among them, 22 lines successfully introduced the resistance gene Yr62 and evaluated the agronomic traits. Finally, nine lines with good agronomic traits and disease resistance were successfully selected. The wheat lines finally screened in this study provide material support for the future breeding of wheat for stripe rust resistance.