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Effects of Two Major Fusarium Head Blight Resistance QTL Verified in a Winter Wheat Backcross Population

^a Bavarian State Research Center for Agriculture, Institute for Crop Science and Plant Breeding, Am Gereuth 8, 85354 Freising, Germany
^b Technical Univ. of Munich, Chair of Plant Breeding, Am Hochanger 2, 85350 Freising-Weihenstephan, Germany
^c Lochow-Petkus GmbH, Bollersener Weg 5, 29303 Bergen, Germany

View larger version (24K): [in this window] [in a new window]   Figure 1. Quantitative trait loci (QTL) analysis of Fusarium head blight (FHB) severity for chromosome 7BS (a) with three additional amplified fragment length polymorphism (AFLP) and simple sequence repeat (SSR) markers and chromosome 6AL (b) with eight additional AFLP markers resulting from bulked segregant analysis using the 145 recombinant inbred lines of the original Dream/Lynx mapping population (Schmolke et al., 2005). The newly integrated AFLP and SSR markers are underlined.

View larger version (10K): [in this window] [in a new window]   Figure 2. Frequency distribution of Fusarium head blight (FHB) severity of the 127 selected BC2F4 genotypes (Dream/4*Lynx) after spray inoculation with Fusarium culmorum. Data are based on means across the three environments 2005. The arrows indicate disease levels of the parents Dream and Lynx, respectively.

View larger version (14K): [in this window] [in a new window]   Figure 3. Boxplot distributions of the 127 selected BC2F4 lines (Dream/4*Lynx) after spray inoculation with Fusarium culmorum differentiated by the four marker classes possessing susceptible (S) and/or resistance (R) alleles of Qfhs.lfl-6AL and Qfhs.lfl-7BS. Data are based on means averaged across all three environments 2005. Solid lines, median; +, means. * Different letters indicate significant differences after a SCHEFFE test for multiple comparisons of means (P < 0.05).