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The mating system and microevolution.

R W Allard

    Genetics
    |June 1, 1975
    PubMed
    Summary
    This summary is machine-generated.

    Predominantly selfing plant species exhibit structured genetic distributions, facilitating adaptation and evolutionary flexibility. Self-fertilization enhances local adaptation by increasing fitness and enabling long-term natural selection responses.

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    Area of Science:

    • Plant genetics
    • Evolutionary biology
    • Population genetics

    Background:

    • Genotypic frequency distributions in plant populations are highly structured, particularly in species that predominantly self-fertilize.
    • This genetic organization includes strong correlations in allelic states across loci and significant micro-geographical differentiation.
    • Self-fertilization plays a key role in facilitating both genetic structure and spatial heterogeneity.

    Purpose of the Study:

    • To explore how self-fertilization influences genetic organization within plant populations.
    • To understand the implications of this genetic structure for adaptation and evolutionary potential.
    • To examine the role of mating systems in ecogenetic adaptation.

    Main Methods:

    • Analysis of natural and experimental plant populations.

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  • Examination of genotypic frequency distributions and allelic correlations.
  • Assessment of gene flow and spatial differentiation in relation to mating systems.

    • Main Results:

    • Self-fertilization reduces heterozygosity, strengthening allelic correlations and facilitating the development of supergenes.
    • Reduced gene flow due to selfing promotes micro-geographical differentiation, creating genetic patterns that mirror environmental heterogeneity.
    • This genetic structuring enhances immediate fitness and adaptation to local environments while preserving genetic variability for future selection.

    Conclusions:

    • Selfing in plants structures genetic variability, leading to increased local adaptation and fitness.
    • The mating system, particularly self-fertilization, is a crucial factor in ecogenetic adaptation and evolutionary strategy.
    • Plant populations can readily modify their mating systems, with a significant proportion utilizing selfing for adaptive benefits.