Abstract
Fusarium head blight (FHB) is one of the most important wheat diseases that causes yield and quality losses as well as contamination with deoxynivalenol (DON). This study aimed for marker-based introduction of three previously mapped QTLs from two German winter wheat resistance sources into an elite background unrelated to the mapping population. A double cross (DC) served as initial population that combined two resistance donor-QTL alleles from “Dream” (Qfhs.lfl-6AL, Qfhs.lfl-7BS) and one donor-QTL allele from “G16-92” on chromosome 2BL with two high yielding, susceptible elite winter wheats (“Brando”, “LP235.1”). The initial population of 600 DC-derived F1 lines was selected with SSR markers for the respective QTLs. After two marker-selection steps, each of eight marker classes was represented by 9–22 lines possessing the respective donor-QTL allele or all possible combinations thereof in the homozygous state. The effect of the QTLs was estimated by field tests at four locations inoculated with Fusarium culmorum. Resistance was measured as the mean of multiple FHB ratings (0–100%). Marker classes incorporating only one QTL were not significantly more resistant than the class without any QTL, the combination of two donor-QTL alleles reduced FHB significantly. On average, lines with Qfhs.lfl-6AL were significantly taller than lines without this QTL. A considerable variation for FHB resistance was found in all marker classes. Marker-based introduction of two QTLs enhanced mean FHB rating by about 40 percentage points, the selected plants, however, were, on average, significantly taller. Both findings strongly support a phenotypic selection following after marker-based introduction of effective QTLs.
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Acknowledgments
The authors thank O. Kram, M. Raith, Stefanie Sabrowski, Bianca Schneider, and Meike Scholz for their excellent technical assistance in data collection. This project was supported by the German Federal Ministry of Education and Research (BMBF, Bonn; FKZ 0312559) and the KWS LOCHOW GmbH within the German-French EUREKA Consortium (Project No. Σ! 2386).
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Communicated by B. Keller.
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Wilde, F., Schön, C.C., Korzun, V. et al. Marker-based introduction of three quantitative-trait loci conferring resistance to Fusarium head blight into an independent elite winter wheat breeding population. Theor Appl Genet 117, 29–35 (2008). https://doi.org/10.1007/s00122-008-0749-8
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DOI: https://doi.org/10.1007/s00122-008-0749-8