野生二粒小麦抗条锈病基因YrD479的定位

Wheat is the No. 2 cereal crop providing staple foods in China. The annual planted area of wheat is about 24 Mha. Wheat stripe rust, caused by Puccinia striiformis f. sp. tritici, is a devestating disease in wheat production. Breeding and growing resistant cultivars is the most economic and environmental friendly way to control the disease. Discovery and utilization of novel resistance genes is fundamental for wheat disease resistance breeding and germplasm improvement. Wild emmer wheat, Triticum dicoccoides (2n=4x=28, AABB), is a valuable genetic resource harboring untaped gene pool for disease resistance and stress tolerance. In this paper, we discovered a gene that confer adult-plant resistance to stripe rust in the wild emmer 'DIC479', and designated it as YrD479. It caused necrosis on infected tissues and prevented expansion of rust sporulation. Using a F2 population including 188 individuals, YrD479 was maped to chromosome 2BS within a 4.8 cM interval of Xsdau018 - Xsdau013, and displayed tight linkage to the SSR marker Xgwm374, which founds marker-assisted selction for the YrD479 gene.