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Evidence for coadaptation in Avena barbata.

R W Allard, G R Babbel, M T Clegg

    Proceedings of the National Academy of Sciences of the United States of America
    |October 1, 1972
    PubMed
    Summary

    Two populations of wild oat (Avena barbata) show distinct allele combinations. Selection appears to maintain these coadapted gene sets, adapted to either wet or dry microhabitats.

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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:

    • Population genetics
    • Plant evolutionary biology
    • Ecology

    Background:

    • Wild oat (Avena barbata) populations exhibit complex genetic structures.
    • Environmental heterogeneity influences plant population differentiation.
    • Microsite variation can drive local adaptation in plant species.

    Purpose of the Study:

    • To investigate the genetic structure and microdifferentiation of Avena barbata populations.
    • To correlate allele distributions with environmental factors at a fine scale.
    • To identify patterns of gametic-phase disequilibrium and their adaptive significance.

    Main Methods:

    • Intensive sampling of two Avena barbata populations across a fine grid.
    • Determination of allelic frequencies at six enzyme loci.
    • Multilocus analyses to assess gametic-phase disequilibrium and identify gametic types.

    Main Results:

    • Allele distributions within microniches correlated with environmental gradients.
    • Significant gametic-phase disequilibrium observed for both linked and unlinked loci.
    • Two balanced five-locus gametic types, associated with mesic and xeric conditions, were in excess.

    Conclusions:

    • Selection favors coadapted allele combinations (gametic types) adapted to specific microhabitats.
    • Restriction of recombination, via linkage or inbreeding, maintains these adaptive gametic types.
    • Genetic differentiation and adaptation occur at a microscale within Avena barbata populations.

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