Detection of QTLs for Stagonospora glume blotch resistance in Swiss winter wheat |
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Authors: | T.?Schnurbusch,S.?Paillard,D.?Fossati,M.?Messmer,G.?Schachermayr,M.?Winzeler,B.?Keller author-information" > author-information__contact u-icon-before" > mailto:bkeller@botinst.unizh.ch" title=" bkeller@botinst.unizh.ch" itemprop=" email" data-track=" click" data-track-action=" Email author" data-track-label=" " >Email author |
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Affiliation: | (1) Institute of Plant Biology, University of Zürich, Zollikerstrasse 107, 8008 Zürich, Switzerland;(2) Swiss Federal Research Station for Agroecology and Agriculture (FAL), Reckenholzstrasse 191, 8046 Zürich, Switzerland;(3) Swiss Federal Research Station for Plant Production, Changins, Route de Duillier, P.O. Box 254, 1260 1 Nyon, Switzerland;(4) Pharmaceutical Institute, University of Basel, Benkenstrasse 254, 4108 Witterswil, Switzerland |
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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' 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.Communicated by H. C. Becker |
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Keywords: | Triticum aestivum QTL Stagonospora nodorum Glume blotch Resistance |
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