文摘
Molecular identification of wheat powdery mildew resistance (Pm) genes in breeding lines or cultivars is important for resistance breeding. Wanfengjian 34, a Chinese wheat breeding line with desirable agricultural performance in China, showed high level of resistance to powdery mildew at both seedling and adult stages. Genetic analysis demonstrated that the resistance to different Blumeria graminis f. sp. tritici isolates in Wanfengjian 34 was controlled by a single dominant Pm gene, temporarily designated PmWFJ. PmWFJ was mapped to chromosome arm 5DS and flanked by the simple sequence repeat marker Cfd81 and sequence characterized amplified region marker SCAR112 with genetic distance of 0.1 and 1.0 cM, respectively. PmWFJ shared the same locus with the documented Pm genes on the multi-allelic Pm2 locus by allelism tests between PmWFJ and Pm2 alleles, but showed unique powdery mildew reaction pattern compared with these documented Pm genes. Therefore, PmWFJ appears to be a new allele at the documented Pm2 locus. Four closely linked markers of PmWFJ were validated the applicability in 131 cultivar backgrounds for marker-assisted selection.