MAPPING DISEASE RESISTANCE QTL FOR FUSARIUM HEAD BLIGHT AND LEAF RUST IN A WHEAT DOUBLED HAPLOID POPULATION

Fusarium graminearum and Puccinia triticina are common wheat pathogens in the Mid-Atlantic region, causing Fusarium head blight (FHB) and leaf rust, respectively. Both diseases can cause serious yield losses in epidemic conditions and can be controlled by breeding resistant cultivars. MD01W233-06-1 is an adapted soft red winter wheat (SRWW) breeding line with previously uncharacterized "native" FHB resistance. SS8641 is an FHB-susceptible SRWW cultivar that has the leaf rust resistance gene Lr37 and an additional unidentified source of resistance. These parents were used to generate a doubled haploid mapping population to map their resistance to these diseases. Four FHB resistance quantitative trait loci (QTL) were mapped to chromosomes 3B (3 QTL) and 1A (1 QTL). Several QTL in SRWW have been mapped to these regions. Two leaf rust resistance QTL were mapped to chromosomes 2A, the same location as Lr37, and 5B, known to contain Lr18, previously unreported in either parent