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Coadaptation in plant populations.

R W Allard

    Basic Life Sciences
    |March 1, 1976
    PubMed
    Summary

    Plant breeding selection organizes genotypes into coadapted gene complexes. These complexes enhance fitness by creating favored allele combinations, demonstrating non-random population structure.

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    Performance and stability of mixtures of grain sorghum : I. Relationship between level of genetic diversity and performance.

    TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·2014

    Area of Science:

    • Plant genetics
    • Evolutionary biology
    • Population genetics

    Background:

    • A key question in plant breeding is whether alleles at different loci act independently or form structured genotypes.
    • Previous studies show allele distributions in plant populations correlate with environmental factors across scales.

    Purpose of the Study:

    • To investigate the population genetic structure in plant breeding.
    • To determine if favored combinations of alleles occur more frequently than expected by chance.

    Main Methods:

    • Utilized allozyme loci as genetic markers.
    • Performed multilocus analyses on natural and experimental populations of inbreeding plants.

    Main Results:

    • Observed allele distributions closely correlated with micro- and macrogeographic environmental scales.
    • Detected significant gametic phase disequilibrium (linkage disequilibrium) within local populations.

    Conclusions:

    • Selection actively organizes populations into coadapted gene complexes.
    • These complexes represent non-random associations of alleles promoting local environmental adaptation and high fitness.

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