Submitted to: Plant and Animal Genome VX Conference Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: October 15, 2006
Publication Date: January 13, 2007
Citation: Faris, J.D., Kumar, S., Friesen, T.L. 2007. Identification of a novel Fusarium head blight resistance QTL on chromosome 7A in tetraploid wheat. Plant and Animal Genome VX Conference Abstracts. p. 179. Technical Abstract: Fusarium head blight (FHB) caused by Fusarium graminearum is one of the most destructive diseases of durum (Triticum turgidum ssp. durum) and common wheat (T. aestivum). Promising sources of FHB resistance have been identified among common (hexaploid) wheats, but the same is not true for durum (tetraploid) wheats. T. turgidum ssp. dicoccoides, or wild emmer wheat, is a potential tetraploid source of FHB resistance. A previous study indicated that chromosome 7A from T. turgidum ssp. dicoccoides accession PI478742 contributed significant levels of resistance to FHB. In this study a genetic linkage map of chromosome 7A was constructed in a population of 118 recombinant inbred lines derived from a cross between the durum cultivar Langdon (LDN) and a disomic LDN- T. turgidum ssp. dicoccoides PI478742 chromosome 7A substitution line [LDN-DIC 7A(742)]. The population was evaluated for Type II FHB resistance in three greenhouse seasons. Interval regression analysis indicated that a single quantitative trait locus (QTL) designated Qfhs.fcu-7AL explained 19% of the phenotypic variation and spanned an interval of 39.6 cM. Comparisons between the genetic map and a previously constructed physical map of chromosome 7A indicated that Qfhs.fcu-7AL is located in the proximal region of the long arm. It would be beneficial to combine Qfhs.fcu-7AL with the QTL Qfhs.ndsu-3AS in order to develop durum wheat germplasm and cultivars with higher levels of FHB resistance.