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Related Experiment Videos

A Morphogenetic Model Accounting for Pollen Aperture Pattern in Flowering Plants

Ressayre1, Godelle, Mignot

  • 1Laboratoire Evolution et systématique, Université Paris-Sud, 91405 Orsay Cedex, France

Journal of Theoretical Biology
|September 15, 1998
PubMed
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Pollen grain aperture number is determined during meiosis. A new model explains how nuclei influence cytokinesis, leading to aperture patterns and variations in dicotyledonous plants.

Area of Science:

  • Plant reproductive biology
  • Developmental biology
  • Cellular morphogenesis

Background:

  • Pollen grains possess resistant walls with apertures crucial for germination.
  • Aperture number is linked to meiosis and tetrad formation in microsporogenesis.
  • Simultaneous cytokinesis in dicotyledonous plants results in a four-nuclei syncytium before cell division.

Purpose of the Study:

  • To propose a theoretical morphogenetic model for pollen grain ontogeny.
  • To explain the link between meiotic nuclear behavior and aperture pattern formation.
  • To account for variations in aperture number and heterogeneous tetrad composition.

Main Methods:

  • Development of a theoretical model based on nuclear attractors and morphogenetic substance.

Related Experiment Videos

  • Analysis of nuclear interactions during the second meiotic division.
  • Explanation of cytokinesis patterns and their influence on pollen grain morphology.

    • Main Results:

    • The model successfully predicts the common three-aperture pattern in dicotyledonous plants via bipolar nuclear interactions.
    • Variations in aperture distribution are explained by disturbances in these interactions.
    • The model accounts for aperture duplication and the formation of heterogeneous pollen tetrads.

    Conclusions:

    • Nuclear arrangement and interactions during meiosis significantly influence pollen grain aperture number and distribution.
    • The proposed model provides a mechanistic explanation for observed pollen grain developmental patterns.
    • This framework helps understand the generation of morphological diversity within pollen tetrads.