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Is Eucalyptus Cryptically Self-incompatible?

Tasmien N Horsley1, Steven D Johnson

  • 1School of Biological and Conservation Sciences, University of KwaZulu-Natal, Scottsville, South Africa. tasmien.horsley@sappi.com

Annals of Botany
|September 21, 2007
PubMed
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Eucalypt species Eucalyptus urophylla and Eucalyptus grandis show slower self-pollen tube growth and reduced seed yield, indicating cryptic self-incompatibility promotes out-crossing.

Area of Science:

  • Plant reproductive biology
  • Eucalyptus breeding systems
  • Self-incompatibility mechanisms

Background:

  • Self-incompatibility systems influence fertilization probability from self- vs. cross-pollen.
  • Pollen tube fate is critical in plant mating systems.

Purpose of the Study:

  • Investigate breeding systems in Eucalyptus urophylla and Eucalyptus grandis.
  • Analyze pollen tube growth dynamics after self- and cross-pollination.

Main Methods:

  • Epifluorescence microscopy used to visualize pollen tube growth.
  • Comparative analysis of pollen tube transit times in styles.
  • Seed yield assessment following self- and cross-pollination.

Main Results:

Related Experiment Videos

  • Self-pollen tubes grew significantly slower than cross-pollen tubes in both species.
  • E. urophylla: 120 h (self) vs. 96 h (cross).
  • E. grandis: 96 h (self) vs. 72 h (cross).
  • Reduced seed yields observed in both species after self-pollination.

    • Conclusions:

    • Late-acting self-incompatibility is present in these eucalypt species.
    • Cryptic self-incompatibility may drive preferential out-crossing.
    • These mechanisms ensure genetic diversity in Eucalyptus populations.