Comparison of methods for calculating the heritability of adult field resistance to yellow rust and grain yield in spring wheat |
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Authors: | W W Wagoire R Ortiz J Hill O Stølen |
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Institution: | (1) Department of Agricultural Sciences, The Royal Veterinary and Agricultural University, 40 Thorvaldsensvej, DK-1871 Frederiksberg C, Copenhagen, Denmark, DK |
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Abstract: | Several methods are available for estimating heritability in disomic species, including parent-offspring regression, realized
heritability, intraclass correlations of recombinant inbred lines, and diallel-cross analysis. Estimates were obtained by
these various methods for a set of eight bread wheat (Triticum aestivum) lines adapted to the East African highlands, which had been intercrossed and selfed in a half-diallel arrangement to give
F1, F2 and F3 generations, and F6 recombinant inbred lines. Significant genetic variation existed among parents and crosses for both grain yield and yellow
rust resistance in all generations. Based on the heritability calculated from the analysis of F6 recombinant inbred lines, analysis of the F2 diallel crosses was recommended for determining the heritability of both characters in early segregating generations. The
results also suggest that a form of tandem selection may be effective in developing locally adapted germplasm which combines
high grain yield with yellow rust resistance.
Received: 15 February 1999 / Accepted: 11 March 1999 |
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Keywords: | Triticum aestivum Diallel cross Parent-offspring regression Realized heritability Yellow rust Yield |
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