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Title: Mapping Septoria Leaf Blotch and Soil-borne Mosaic Virus Resistance Genes Derived from Aegilops tauschii

item Brown-Guedira, Gina

Submitted to: Plant and Animal Genome Conference
Publication Type: Abstract Only
Publication Acceptance Date: 10/26/2006
Publication Date: 1/15/2007
Citation: Hall, M.D., Bockus, W., Fritz, A., Brown Guedira, G.L. 2007. Mapping Septoria Leaf Blotch and Soil-borne Mosaic Virus Resistance Genes Derived from Aegilops tauschii. Plant and Animal Genome Conference.

Interpretive Summary: n/a

Technical Abstract: Septoria leaf blotch (STB) is a fungal disease of wheat caused by Septoria tritici and is routinely a problem in temperate wheat growing regions. Soil-borne Wheat Mosaic Virus (SBWMV) is a destructive pathogen of wheat that can cause entire crop failure in localized fields. A linkage analysis of a segregating recombinant inbred line population from the cross KS96WGRC40/Wichita identified genes of major effect conferring resistance to STB and SBWMV. The STB and SBWMV resistance genes within KS96WGRC40 were derived from the Aegilops tauschii accession TA2397. Bulk segregant analysis and deletion bin mapping located the STB resistance gene in KS96WGRC40 in the distal 40% of chromosome 7DS flanked by microsatellite markers Xgwm044 and Xbarc126. Two previously reported STB genes, Stb4 and Stb5, have been mapped to 7DS in the same region as the STB resistance gene within KS96WGRC40. The uniqueness of the STB resistance genes on 7DS is questionable. A bulk segregant analysis located the SBWMV resistance gene in KS96WGRC40 on chromosome 5DL linked to microsatellite marker Xcfd010. The relationship of this gene with a SBWMV resistance QTL mapped in Karl 92 and the Soil-borne Cereal Mosiac Virus resistance gene SbmCz1 is being investigated.