Identification and chromosomal locations of novel genes for resistance to powdery mildew and stripe rust in a wheat line 101-3

Wheat powdery mildew and stripe rust, caused by Blumeria graminis f.sp.tritici (syn. Erysiphe graminis f.sp.tritici) and Puccinia striiformis Westend., respectively, are two important fungal diseases of wheat in many regions in the world that cause significant annual yield losses. In the present study, a dominant powdery mildew and a dominant stripe rust resistance gene in wheat line 101-3 which derived from the progenies of the wide cross between common wheat and Dasypyrum villosum Candary L., was located on chromosome 6B and 1B, respectively, by monosomic analyses. The two genes are different from known resistance genes on chromosome 6B for powdery mildew and 1B for stripe rusts, suggesting that the two genes might be novel resistance genes for powdery mildew and stripe rust, respectively. It is uncertain whether the two genes are allelic or lined with other resistance genes located on chromosome 6B for powdery mildew and 1B for stripe rust. Further allelism tests are necessary to determine the relationships between the resistance gene and other genes located on chromosome 6B for powdery mildew and 1B for stripe rust through molecular markers.