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Incompatibility and pollen competition in Alnus glutinosa: Evidence from pollination experiments.

W Steiner1, H R Gregorius

  • 1Institut für Forstgenetik und Forstpflanzenzüchtung, Universität Göttingen, Göttingen, Fed. Rep. Germany.

Genetica
|October 13, 2005
PubMed
Summary

Alnus glutinosa exhibits both eliminating and cryptic incompatibility, primarily through pollen elimination. This self-incompatibility mechanism likely prevents significant negative impacts on seed production in natural populations.

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Area of Science:

  • Reproductive Biology
  • Plant Genetics
  • Ecology

Background:

  • Plant reproductive systems often involve self-incompatibility mechanisms to prevent inbreeding.
  • Understanding these mechanisms is crucial for predicting population dynamics and genetic diversity.

Purpose of the Study:

  • To investigate the types and operation of incompatibility systems in Alnus glutinosa.
  • To compare in vitro pollen germination with in vivo fertilization success.
  • To define and identify eliminating and cryptic incompatibility in this species.

Main Methods:

  • Numerous pollination experiments, including self-pollination and controlled pollen mixtures.
  • Isozyme genetic markers to identify pollen parentage and fertilization success.
  • In vitro pollen germination experiments on various media.

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Main Results:

  • Both eliminating and cryptic incompatibility were detected in Alnus glutinosa.
  • Eliminating incompatibility manifested solely as self-incompatibility.
  • In vitro germination conditions generally reflected in vivo fertilization success.
  • Incompatibility primarily acts via pollen elimination, not ovule fertilization failure.

Conclusions:

  • Alnus glutinosa possesses both eliminating and cryptic incompatibility systems.
  • Self-incompatibility in this species acts mainly through pollen elimination.
  • Seed production is unlikely to be significantly reduced by self-pollination in natural settings.