engleski

Information from Castle-Wright experiment

The main underlying assumptions of the Castle-Wright formula in plant breeding are presented, including unlinked loci and equal allelic effects at all loci. If the assumptions are violated, the true number of loci is underestimated. We estimated the number of effective genes of an F2 population of maize that was not in linkage equilibrium and in the F2 population (Syn 10) after 10 generations of intermating, which is in approximate linkage equilibrium. Three versions of the effective number of loci are given without their standard errors. nE1, nE2 and nE3 for the silking date are similar for F2 and more different for F2 Syn 10. While nE1 and nE2 for plant height are similar for F2 and F2 Syn 10, nE3 (33.97 and 35.45) almost reached a recombination index of about 36. An investigation of phenotypic standard deviations for silk date, plant height and ear height indicated that linkage did not affect the estimates, because the number of estimated genes are similar for F2 and F2 Syn 10 populations. Consequently, unequal effects of alleles appears to be important.

alleles; genes; genetic effects; genetics; linkage; loci; maize; plant breeding; plant height; recombination; yield components

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