Submitted to: Plant and Animal Genome VX Conference Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 10/30/2005
Publication Date: 1/5/2006
Citation: Stack, R., Faris, J.D. 2006. Identification of a fusarium head blight resistance QTL on chromosome 6b in tetraploid wheat [abstract]. Plant and Animal Genome XIV Conference. Abstract No. P285:172. Interpretive Summary:
Technical Abstract: Fusarium head blight (FHB) is one of the most devastating diseases of bread wheat (Triticum aestivum L., 2n=6x=42) and durum wheat (T. turgidum L., 2n=4x=28). Resistant sources of hexaploid bread wheat have been identified and are currently being employed in breeding programs, but development of resistant tetraploid durum wheat has met with less success. Resistance has been identified in Triticum dicoccoides, a wild tetraploid relative, which readily hybridizes with durum wheat. Evaluation of Langdon durum-T. dicoccoides (LDN-DIC) disomic chromosome substitution lines indicated that T. dicoccoides chromosome 6B contributed a significant level of resistance. In this work, we evaluated a population of 85 recombinant inbred chromosome lines (RICLs) derived from LDN x LDN-DIC 6B for reaction to FHB, and surveyed markers along the previously constructed chromosome 6B genetic linkage map for associations with FHB resistance. Simple linear regression and composite interval regression analysis indicated the presence of a quantitative trait locus (QTL) on the short arm of 6B. This QTL accounted for about 17 percent of the phenotypic variation for resistance to FHB. It will be beneficial to combine this QTL with others to increase the levels of FHB resistance in durum cultivars.