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This article in CS

  1. Vol. 27 No. 5, p. 940-943
     
    Received: Aug 1, 1986
    Published: Sept, 1987


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doi:10.2135/cropsci1987.0011183X002700050023x

Modification of Methods for Identifying Populations to be Used for Improving Parents of Elite Single Crosses1

  1. J. W. Dudley2

Abstract

Abstract

One method of utilizing populations (either adapted or exotic) hybrid breeding programs, is to cross a population (Py) to one of the parents (e.g., I1 of an elite F1 (I1 × 2), self in the F2, and attempt to recover a line superior to I1. For a population to be useful in such a program, it must contain favorable alleles not present in the elite F1. A previous method for identifying such populations lacked generality. A modified method was developed that removes the assumption that frequency of favorable alleles in Py. is equal for all classes of loci except those for which the F1 lacks favorable alleles. The modified method provides estimates of gene frequencies (j and k) at loci for which the F1 is heterozygous. These estimates can be used to determine which of the parental inbreds should be improved by crossing to Py and whether to self directly in the F2 or to backcross prior to selfing. Effects of relaxing the assumption of complete dominance are shown. The modified method provided estimates nearer the true values than previously proposed methods when applied to a set of hypothetical data.

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Copyright © 1987. Crop Science Society of America, Inc.Copyright © 1987 by the Crop Science Society of America, Inc.