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Detection of QTLs for Stagonospora glume blotch resistance in Swiss winter wheat

Abstract : 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 Forno' F 5:7 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 and, respectively. 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 allele originated from the resistant parent 'Arina'. The QTL (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 (gwm389) and (gwm251) which make marker-assisted selection (MAS) for Stagonospora glume blotch resistance feasible. We also found one resistance QTL,, on the long arm of chromosome 5B which overlapped with QTLs for plant height as well as heading time.
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Contributor : Sophie Paillard <>
Submitted on : Tuesday, October 6, 2020 - 2:33:10 PM
Last modification on : Tuesday, March 9, 2021 - 9:45:38 AM

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T Schnurbusch, · Paillard, · Fossati, · Messmer, · Schachermayr, et al.. Detection of QTLs for Stagonospora glume blotch resistance in Swiss winter wheat. Theor Appl Genet., 2003, 107, pp.1226 - 1234. ⟨10.1007/s00122-003-1372-3⟩. ⟨hal-02959056⟩



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