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GrainGenes Reference Report: TAG-107-1226

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Reference	TAG-107-1226
Title	Detection of QTLs for Stagonospora glume blotch resistance in Swiss winter wheat
Journal	Theoretical and Applied Genetics
Year	2003
Volume	107
Pages	1226-1234
Author	Schnurbusch T [ Show all 7 ]
Abstract	Summary: Stagonospora nodorum is the causal agent of the Stagonospora glume blotch disease in hexaploid wheat. The Swiss winter bread wheat cv. ''Arina'' has a highly effective, durable and quantitative glume blotch resistance. We studied 240 single seed descent (SSD)-derived lines of an ''Arina x Forno'' F5:7 population to identify and map quantitative trait loci (QTLs) for glume blotch resistance under natural infestation. Using composite interval mapping (CIM) and LOD>4.5, we detected two chromosomal regions on chromosome arms 3BS and 4BL which were specifically associated with glume blotch resistance. These identified QTLs were designated QSng.sfr-3BS and QSng.sfr-4BL, respectively. QSng.sfr-3BS peaked at the locus Xgwm389 in the telomeric region of the short arm of chromosome 3B and explained 31.2% of the observed phenotypic variance for the resistance within the population. The responsible QSng.sfr-3BS allele originated from the resistant parent ''Arina''. The QTL QSng.sfr-4BL (19.1%) mapped to chromosome arm 4BL (''Forno'' allele) very close to two known genes, TaMlo and a catalase (Cat). Both QTL alleles combined could enhance the resistance level by about 50%. Additionally, they showed significant epistatic effects (4.4%). We found PCR-based microsatellite markers closely linked to QSng.sfr-3BS (gwm389) and QSng.sfr-4BL (gwm251) which make marker-assisted selection (MAS) for Stagonospora glume blotch resistance feasible. We also found one resistance QTL, QSng.sfr-5BL, on the long arm of chromosome 5B which overlapped with QTLs for plant height as well as heading time
External Databases	Pubmed: 12928778
Keyword	[ Hide all but 1 of 22 ] barley bread wheat chromosomal location defense gene glume blotch head blight resistance hexaploid wheat inheritance map mapping microsatellite marker natural phaeosphaeria-nodorum qtl resistance resistant septoria nodorum blotch stagonospora nodorum stress triticum aestivum winter wheat

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