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Landessaatzuchtanstalt

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Browsing Landessaatzuchtanstalt by Subject "Aggressiveness"

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    Effects of non-adapted quantitative trait loci (QTL) for Fusarium head blight resistance on European winter wheat and Fusarium isolates
    (2010) Ohe, Christiane von der; Miedaner, Thomas
    Fusarium head blight (FHB), caused by Fusarium graminearum and F. culmorum, is a devastating disease responsible for tremendous damage in wheat fields and contamination of grain with mycotoxins deoxynivalenol (DON) and nivalenol (NIV), rendering the harvest unsafe for human and animal consumption. The variability of Fusarium populations is high and changes in aggressiveness, chemotypes or species within and among Fusarium populations are known. Stable FHB resistance combined with high yield is one main target in wheat breeding programs. Mapping studies detected several quantitative trait loci (QTL) for FHB resistance in non-adapted sources, such as Sumai3 from China. The two most important and commonly used major QTL are located on chromosome 3BS (Fhb1) und 5A (Qfhs.ifa-5A). However, negative side effects of non-adapted resistance sources introgressed in elite winter wheat material are feared in Europe. Furthermore, the stability of the QTL effect against changing Fusarium populations is unknown. The objectives of this research were to analyze whether (1) the QTL Fhb1 and Qfhs.ifa-5A introgressed from a non-adapted resistance source into two winter wheat varieties have possible side effects on agronomic and quality performance, (2) 3-ADON and 15-ADON chemotypes are significantly different in their aggressiveness and DON production, (3) competition among Fusarium isolates in mixtures exists, and if so, how the resistant host will influence this competition. In conclusion, both resistance QTL are effective and stable in elite spring and winter wheat backgrounds. For improvement of FHB resistance both QTL are valuable, but Qfhs.ifa-5A would suffice for European breeding programs. Due to chemotype shifts, 3-ADON isolates could pose a greater risk to food safety than 15-ADON but breeding and use of highly resistant lines can reduce the risks associated with DON in wheat. Accordingly, resistant spring wheat lines were less affected by the tested Fusarium isolates and mixtures and, therefore, confirmed a high stability of these QTL. Directed selection of highly aggressive isolates due to the resistance QTL seems to be unlikely in the short term.