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Title: Genetic Analysis of Resistance to Soil-borne Wheat Mosiac Virus Derived from Aegilops tauschii

item HALL, M
item FRITZ, A
item Brown-Guedira, Gina

Submitted to: Euphytica
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 2/24/2009
Publication Date: 3/31/2009
Citation: Hall, M.D., Fritz, A.K., Brown Guedira, G.L. Genetic Analysis of Resistance to Soil-borne Wheat Mosiac Virus Derived from Aegilops tauschii. Euphytica. 169:169-176. 2009.

Interpretive Summary: Soil-borne viruses can cause yield losses in wheat in most growing regions of the world. In the Southern Great Plains of the U.S., the Soil-borne Wheat Mosaic Virus (SBWMV) has caused reported yield losses of up to 45%. The virus can cause total crop loss in localized fields where susceptible varieties are grown. Growing resistant varieties is the only effective method for controlling SBWMV in infected fields. In this study, we analyzed the resistance to SBWMV in a winter wheat line that was developed from a cross between wheat and a wild diploid ancestor of wheat, Aegilops tauschii, also known as goatgrass. As a result of this analysis, the first DNA molecular markers or tags for a WSBMV resistance gene were identified. This molecular tag can be used by wheat breeders to select new WSBMV resistant varieties.

Technical Abstract: Soil-borne Wheat Mosaic Virus (SBWMV), vectored by the soil inhabiting fungus Polymyxa graminis, causes damage to wheat (Triticum aestivum) yields in most of the wheat growing regions of the world. In localized fields, the entire crop may be lost to the virus. Although many winter wheat cultivars contain resistance to SBWMV, the inheritance of resistance is poorly understood. A linkage analysis of a segregating recombinant inbred line population from the cross KS96WGRC40 x Wichita identified a gene of major effect conferring resistance to soil-borne wheat mosaic virus (SBWMV) in the germplasm KS96WGRC40. The SBWMV resistance gene within KS96WGRC40 was derived from accession TA2397 of Ae. taushcii and is located on the long arm of chromosome 5D, linked to microsatellite marker Xcfd010. The relationship of this locus with a previously identified QTL for SBWMV resistance and the Sbm1 gene conferring resistance to Soil-borne Cereal Mosaic Virus is not known, but suggests that a gene on 5DL conferring resistance to both viruses may be present in T. aetivsum, as well as the D-genome donor Ae. tauschii.