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Estimates of additive and dominance effects for Fusarium head blight resistance of winter triticale
Author(s) -
Oettler G.,
Heinrich N.,
Miedaner T.
Publication year - 2004
Publication title -
plant breeding
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.583
H-Index - 71
eISSN - 1439-0523
pISSN - 0179-9541
DOI - 10.1111/j.1439-0523.2004.01010.x
Subject(s) - biology , backcrossing , heterosis , triticale , cultivar , additive genetic effects , dominance (genetics) , allele , transgressive segregation , hybrid , agronomy , horticulture , genetics , quantitative trait locus , gene , heritability
The most effective strategy to control Fusarium head blight (FHB), a devastating disease of small‐grain cereals, is breeding resistant cultivars. This resistance study of F 1 crosses, F 2 and backcross generations of triticale estimates heterosis, general and specific combining ability (GCA, SCA), additive and dominance effects and compares parents with segregating generations. The genetic material consisted of 10 parents with their 45 F 1 crosses and of six parents with their 15 F 2 progeny and backcrosses to each parent. Genotypes were grown in various environments and artificially inoculated with an aggressive isolate of F. culmorum. FHB was assessed, by visual rating, as the mean of four to five individual ratings of disease development. Heterosis for FHB was of little importance. The correlation between the FHB rating of F 1 crosses and their mid‐parent performance was close. GCA was the predominant source of variation, although the significance of the SCA variance also implied non‐additive allelic interaction. The preponderance of additive gene effects is encouraging for increasing resistance by a recurrent selection programme. The relationship between the GCA effect of a parent and its per se performance was close, which gives the possibility of predicting FHB resistance in F 1 crosses. Additive effects were predominant in the F 2 progeny and also in the backcrosses. Transgressive segregants could not be detected. Searching for them should be postponed to the F 3 or later generations.