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ARS Home » Midwest Area » Ames, Iowa » Corn Insects and Crop Genetics Research » Research » Publications at this Location » Publication #108726
Title: PARTITIONING OF GENETIC VARIANCE WITHIN AND AMONG BREEDING POPULATIONS AND CHOICE OF OPTIMAL METAPOPULATION STRUCTURE

Author
item Lamkey, Kendall
item EDWARDS, J - MONSANTO COMPANY

Submitted to: American Society of Agronomy Meetings
Publication Type: Abstract Only
Publication Acceptance Date: 1/5/2000
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: When populations become structured into subpopulations, the genotypic variance in the base population becomes repartitioned into variation among subpopulations and within subpopulations. In addition, the relative importance of additive (heritable) genetic effects to non-heritable effects changes as a function of the degree of population subdivision, the family structure of subpopulations, and the genotypic variance-covariance structure in the base population. The objective of this study was to apply theory developed by Cockerham to a set of estimates of variance components obtained in the BS13(S)C0 population to study the effects of different population structures on selection response. It was found from the genetic variance-covariance structure in BS13(S)C0 that inbreeding does not linearly reduce within line additive genetic variance for grain yield, providing potential for enhanced selection response within subpopulations. Selection response within and among subpopulations with different structures was predicted and compared to quantify the effect of subpopulation structure on selection response.