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Population bottleneck associated with but likely preceded the recent evolution of self-fertilization in a coastal dune plant. | LitMetric

AI Article Synopsis

  • The transition to self-fertilization in the plant Abronia umbellata may have been driven by a past population bottleneck that reduced genetic variation across lineages.* -
  • Once selfing evolved, genetic diversity significantly decreased, with the selfing population (var. breviflora) showing up to 94% less nucleotide diversity compared to the outcrossing population (var. umbellata).* -
  • The findings suggest a single, recent origin of selfing (7-28 thousand years ago) linked to a historical bottleneck, which may have initially reduced genetic load, paving the way for the evolution of selfing.*

Article Abstract

Evolution of self-fertilization may be initiated by a historical population bottleneck, which should diagnostically reduce lineage-wide genetic variation. However, selfing can also strongly reduce genetic variation after it evolves. Distinguishing process from pattern is less problematic if mating system divergence is recent and geographically simple. Dramatically reduced diversity is associated with the transition from outcrossing to selfing in the Pacific coastal endemic Abronia umbellata that includes large-flowered, self-incompatible populations (var. umbellata) south of San Francisco Bay and small-flowered, autogamous populations (var. breviflora) to the north. Compared to umbellata, synonymous nucleotide diversity across 10 single-copy nuclear genes was reduced by 94% within individual populations and 90% across the whole selfing breviflora lineage, which contained no unique polymorphisms. The geographic pattern of genetic variation is consistent with a single origin of selfing that occurred recently (7-28 kya). These results are best explained by a historical bottleneck, but the two most northerly umbellata populations also contained little variation and clustered with selfing populations, suggesting that substantial diversity loss preceded the origin of selfing. A bottleneck may have set the stage for the eventual evolution of selfing by purging genetic load that prevents the spread of selfing.

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Source
http://dx.doi.org/10.1093/evolut/qpac047DOI Listing

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