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Foundation Populations for Adapted by Exotic Crosses 1
Author(s) -
Bridges W. C.,
Gardner C. O.
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/cropsci1987.0011183x002700030014x
Subject(s) - biology , selection (genetic algorithm) , germplasm , population , backcrossing , introgression , evolutionary biology , term (time) , genetics , demography , botany , machine learning , computer science , gene , physics , quantum mechanics , sociology
Introgression of exotic germplasm into adapted breeding populations is needed to reduce problems of genetic vulnerability and selection plateaus. Our objective was to determine whether the F 2 or the first backcross to the adapted population (BC 1 ) was the better foundation population in which to begin selection. Selection response was calculated in the foundation populations based on two different additive genetic models. The calculated selection responses were then used to compare the F 2 and BC 1 . Results of the comparisons indicate (i) the F 2 is better for both long‐term and short‐term selection goals when the adapted and exotic populations perform the same, (ii) the BC 1 is better for short‐term goals when the adapted population is superior, (iii) the BC 1 is better for long‐term goals when the adapted population is superior due to a greater number of loci with favorable alleles present, and (iv) the F 2 is better for long‐term goals when the adapted population is superior due to the presence of favorable alleles at loci with large effects.