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Clonal and spatial genetic structure in Eurya emarginata (Theaceae).

M G Chung1, B K Epperson

  • 1Department of Biology, Gyeongsang National University, Chinju 660-701, Korea. mgchung@nongae.gsnu.ac.kr

Heredity
|April 13, 2000
PubMed
Summary

Eurya emarginata, a clonal tree, shows extensive clone dispersal but limited genetic isolation by distance from clonal spread. Seed and pollen dispersal, however, significantly shape its genetic structure.

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Area of Science:

  • Population Genetics
  • Plant Ecology
  • Reproductive Biology

Background:

  • Eurya emarginata (Theaceae) is a dioecious, insect-pollinated tree.
  • This species exhibits both sexual reproduction and clonal spread.
  • It has a narrow distribution along coastal areas of East Asia.

Purpose of the Study:

  • To investigate the clonal structure of Eurya emarginata.
  • To analyze the spatial distribution of allozyme polymorphisms.
  • To determine the contribution of clonal reproduction to genetic isolation by distance.

Main Methods:

  • Allozyme loci analysis.
  • Spatial autocorrelation statistics.
  • Join-count statistics.

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Main Results:

  • The population exhibits moderate allozyme variability (mean He=0.133) and high genotypic diversity (mean DG=0.992).
  • Clones constituted 37.7% of the population, with a large mean clone-pair distance of 35.06 m.
  • Genetic patch width was at least 24 m.
  • Clonal reproduction did not significantly contribute to genetic isolation by distance.

Conclusions:

  • Despite long-distance clone formation, clonal spread has a limited impact on genetic isolation by distance in Eurya emarginata.
  • Genetic structure is primarily shaped by limitations in seed and pollen dispersal.