Combining ability of resistance to head blight caused by Fusarium culmorum (W.G. Smith) in the F1 of a seven parent diallel of winter wheat (Triticum aestivum L.) |
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| Authors: | Hermann Buerstmayr Marc Lemmens Stefan Berlakovich Peter Ruckenbauer |
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| Institution: | (1) Department of Biotechnology in Plant Production, Konrad, IFA-Tulln, Institute for Agrobiotechnology, Lorenz Strasse 20, A-3430 Tulln, Austria |
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| Abstract: | Fusarium head blight (FHB, scab) caused by Fusarium spp. is a widespread disease of cereals causing relevant yield and quality losses and contaminating cereal products with mycotoxins.
Breeding resistant cultivars is the method of choice for controlling the disease. Resistance to FHB is a quantitative trait
and is most likely governed by several genes. We present the results of an F1 diallel analysis of FHB resistance involving six resistant and one susceptible European winter wheat genotypes of diverse
origin in order to identify promising combinations for the selection of improved cultivars. Parents and F1s including reciprocals were evaluated for FHB resistance in an artificially inoculated field trial. Two traits were assessed:
visual disease symptoms on the heads and the percentage of Fusarium damaged kernels in a harvested sample. General combining
ability (GCA) and specific combining ability (SCA) effects were statistically significant for visual symptoms and kernel damage,
whereas reciprocal effects were small or not significant. Heterosis for resistance was common, indicating that the parental
genotypes possess different resistance genes. Selection of transgressive segregates should be feasible from such heterotic
combinations.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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| Keywords: | diallel analysis Fusarium culmorum heterosis resistance scab wheat |
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