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HYBRIDIZATION AS A DISPERSAL MECHANISM.

Bradley M Potts1, James B Reid1

  • 1Botany Department, University of Tasmania, Hobart, Tasmania, 7001, AUSTRALIA.

Evolution; International Journal of Organic Evolution
|June 6, 2017
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Summary
This summary is machine-generated.

Hybridization significantly expands gene dispersal for Eucalyptus risdonii, overcoming limited seed dispersal. This pollen flow facilitates invasion into Eucalyptus amygdalina habitats, driving evolutionary adaptation.

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Area of Science:

  • Ecology
  • Evolutionary Biology
  • Genetics

Background:

  • Limited seed dispersal restricts gene flow in some plant species.
  • Interspecific hybridization can play a role in gene dispersal and adaptation.
  • Previous studies indicated Eucalyptus risdonii regeneration favored by current selective pressures.

Purpose of the Study:

  • To investigate the evolutionary significance of hybridization in Eucalyptus, particularly for gene dispersal.
  • To compare seed versus pollen-mediated gene dispersal of Eucalyptus risdonii.
  • To assess the impact of long-distance pollen flow and hybridization on Eucalyptus populations.

Main Methods:

  • Quantified seed dispersal distance for Eucalyptus risdonii (s = 4.6 m).
  • Measured pollen dispersal distance and gene flow into Eucalyptus amygdalina range (s = 82 m).
  • Analyzed hybrid phenotypes and genetic makeup in Eucalyptus populations.

Main Results:

  • Pollen dispersal of E. risdonii genes into E. amygdalina range is extensive, significantly exceeding seed dispersal.
  • Interspecific hybridization effectively doubles the dispersal range of E. risdonii genes.
  • Hybrid patches and E. risdonii-like individuals were observed far from the species boundary, indicating successful gene introgression and selection.

Conclusions:

  • Hybridization, driven by long-distance pollen flow, is a significant mechanism for gene dispersal in Eucalyptus, especially where seed dispersal is limited.
  • This process enables E. risdonii to colonize new habitats within E. amygdalina forests, independent of seed migration.
  • Selection favors E. risdonii gene combinations in subsequent generations, facilitating invasion and adaptation.