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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 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.
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https://hal.inrae.fr/hal-02959056
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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