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Estimates of combining ability for resistance of winter rye to Fusarium culmorum head blight



Estimates of combining ability for resistance of winter rye to Fusarium culmorum head blight



Euphytica 89(3): 339-344



Head blight caused by Fusarium culmorum and F. graminearum is damaging in all winter rye (Secale cereale L.) growing areas. For hybrid breeding, the relative magnitude of general (GCA) and specific combining ability (SCA) is a crucial parameter for developing appropriate selection procedures. Forty single-cross hybrids were produced by crossing six and seven inbred lines of the Petkus and Carsten gene pool, respectively, in a factorial design. Hybrids were evaluated in two years with artificial F. culmorum inoculation. Resistance traits were head blight rating and grain weight relative to the non-inoculated control. Both resistance traits were closely correlated across both years (r apprxeq -0.8, P = 0.01). Significant genotypic variation was found for both traits with medium to high estimates of heritability (h-2 = 0.6-0.8). Components of variance for GCA were, across years, 10 and 6 times larger than those for SCA for head blight rating and relative grain weight, respectively. Significant SCA effects were found for 15 to 20% of all cross combinations across both traits in each year. SCA effects were, however, inconsistent over years leading to a high SCA-year interaction. In conclusion, resistance to Fusarium head blight among the interpool hybrids tested was conditioned mainly by additive gene action that could be utilized by recurrent selection in multi-environment trials.

Accession: 002831235

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DOI: 10.1007/bf00022290

Download PDF Full Text: Estimates of combining ability for resistance of winter rye to Fusarium culmorum head blight



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