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This article in CS

  1. Vol. 8 No. 1, p. 61-66
     
    Received: May 2, 1967


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doi:10.2135/cropsci1968.0011183X000800010019x

Inter-Genotypic Competition in Plant Populations I. Feedback Systems with Stable Equilibria in Populations of Autogamous Homozygous Lines1

  1. W. M. Schutz,
  2. C. A. Brim and
  3. C. A. Brim2

Abstract

Abstract

A linear model was developed to describe the competitive effects that may be encountered in populations of soybeans and other autogamous plant species. The model was used to investigate the properties of feedback systems that might develop in populations of autogamous homozygous lines as a result of certain inter-genotypic interactions. Examples were cited which indicated that competitive feedback mechanisms may be a powerful force in the eventual establishment of stable equilibria in evolving populations. Such populations would have reproductive capabilities greater than the mean of the component genotypes in pure stand. An essential ingredient of the feedback mechanism is the occurrence of overcompensation which results when a genotype's reproductive ability is enhanced in competition with another genotype while depressing the reproductive value of its competitor by a lesser amount. Undercompensation does not lead to a stable equilibrium and appears to be a relatively rare occurrence in nature. Implications of competitive effects and feedback systems in bulk-population breeding are discussed.

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