Presentation
Fusarium head blight QTL mapping in durum wheat and Triticum carthlicum sources of resistance
Proceedings of the 11th International Wheat Genetics Symposium, Brisbane, QLD, Australia, 24–29 August 2008.
(2008)
Abstract
Durum wheat (Triticum turgidum L. subsp. durum (Desf.) Husn.) is susceptible to Fusarium graminearum Schwabe [teleomorph Gibberella zeae (Schw.) Petch], causal agent of Fusarium head blight (FHB), which reduces grain yield, quality and economic value of the crop. This study was conducted to map quantitative trait loci (QTL) for FHB resistance from two crosses. Doubled haploid (DH) lines were developed from the cross (DH1) ‘Strongfield’ x ‘Blackbird’ (a Triticum turgidum subsp. carthlicum (Nevski in Kom.) Á.Löve & D.Löve genotype), and the cross (DH2) ‘DT707’ x ‘DT696’ (both advanced Canadian durum breeding lines). Both populations were evaluated in replicated FHB nurseries utilizing artificial inoculations under field conditions. The populations were rated for FHB incidence (Type I resistance) and severity (Type II resistance) and on a 1-9 disease rating scale. The two populations were genotyped with microsatellite markers to construct linkage maps and for QTL mapping. The multiple QTL mapping analyses revealed a QTL peak in DH1 at cfa2153 on chromosome 1AS (Blackbird as the source of resistance) explaining up to 24% of the phenotypic variation (LOD 5.4) for FHB incidence, up to 15% (LOD 3.1) for FHB severity, and up to 15% (LOD 3.2) for the 1-9 rating scale. This marker is reported to be linked to Hessian fly resistance genes. In DH2, unlinked markers gwm156 and wmc110 on chromosome 5A were significantly linked to FHB incidence, severity and 1-9 scale. Significant QTLs on 5A have been previously reported (in hexaploid wheat). The cfa2153 locus seems to a good candidate for marker-assisted selection because it is putatively novel and is linked to FHB and Hessian fly resistance.
Disciplines
Publication Date
2008
Location
Brisbane, Australia
Comments
2008 Copyright Sydney University Press
Citation Information
A K Singh, R E Knox, F R Clarke, J M Clarke, et al.. "Fusarium head blight QTL mapping in durum wheat and Triticum carthlicum sources of resistance" Proceedings of the 11th International Wheat Genetics Symposium, Brisbane, QLD, Australia, 24–29 August 2008. (2008) Available at: http://works.bepress.com/asheesh-singh/6/