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Related Experiment Videos

Pollen pool heterogeneity in shortleaf pine, Pinus echinata Mill.

R J Dyer1, V L Sork

  • 1Department of Biology, University of Missouri-St. Louis, 8001 Natural Bridge Rd, St. Louis, MO 63121, USA. rodneyD@bigfoot.com

Molecular Ecology
|May 12, 2001
PubMed
Summary

Pollen movement in temperate trees is restricted by distance and forest density, influencing genetic structure. This study used chloroplast markers to analyze pollen dispersal in Pinus echinata.

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Area of Science:

  • Ecology
  • Population Genetics
  • Forest Science

Background:

  • Pollen dispersal is crucial for genetic exchange in temperate trees.
  • Understanding factors influencing pollen movement is key to comprehending population genetic structure.
  • Isolation by distance and local environmental factors can shape pollen pools.

Purpose of the Study:

  • To investigate the factors influencing pollen pool structure and diversity in Pinus echinata.
  • To test the isolation by distance hypothesis in a temperate tree species.
  • To assess the impact of vegetative structure and pollen donor density on pollen pool genetic composition.

Main Methods:

  • Utilized paternally inherited chloroplast microsatellite markers for genetic analysis.
  • Employed multivariate AMOVA (Analysis of Molecular Variance) on nested stands and regions.

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  • Conducted Mantel correlation to assess the relationship between genetic and physical distances.

    • Main Results:

    • Significant multilocus pollen pool structure was found within regions, but not among them, indicating restricted pollen movement.
    • A significant positive correlation between pairwise genetic and physical distances supported the isolation by distance hypothesis.
    • Pollen pool diversity was negatively associated with forest tree density (vegetative structure), but not with pollen donor availability.

    Conclusions:

    • Pollen movement in continuous Pinus echinata forests is relatively restricted.
    • Both isolation by distance and intervening vegetative structure limit pollen dispersal.
    • These factors play a significant role in shaping the genetic structure of tree populations.