Premium
Modification of Methods for Identifying Populations to be Used for Improving Parents of Elite Single Crosses 1
Author(s) -
Dudley J. W.
Publication year - 1987
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1987.0011183x002700050023x
Subject(s) - selfing , biology , backcrossing , allele , generality , population , dominance (genetics) , genetics , elite , allele frequency , statistics , evolutionary biology , mathematics , gene , demography , psychology , sociology , politics , political science , law , psychotherapist
One method of utilizing populations (either adapted or exotic) hybrid breeding programs, is to cross a population (P y ) to one of the parents (e.g., I 1 ) of an elite F 1 (I 1 × I 2 ), self in the F 2 , and attempt to recover a line superior to I 1 . For a population to be useful in such a program, it must contain favorable alleles not present in the elite F 1 . A previous method for identifying such populations lacked generality. A modified method was developed that removes the assumption that frequency of favorable alleles in P y . is equal for all classes of loci except those for which the F 1 lacks favorable alleles. The modified method provides estimates of gene frequencies ( p̄ j and p̄ k ) at loci for which the F 1 is heterozygous. These estimates can be used to determine which of the parental inbreds should be improved by crossing to P y and whether to self directly in the F 2 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.