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Plastid envelopes in reproductive cells.

P R Bell1

  • 1Department of Botany and Microbiology, University College London, Gower Street, London WC1E 6BT/United Kingdom.

European Journal of Cell Biology
|May 1, 1983
PubMed
Summary

As fern eggs mature, their plastid envelopes change, becoming less unsaturated. This lipid alteration may enhance nutrient exchange between the egg and surrounding cytoplasm during oogenesis.

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Area of Science:

  • Plant biology
  • Cell biology
  • Reproductive biology

Background:

  • Oogenesis involves significant cellular changes in developing egg cells.
  • Plastid and mitochondrial envelopes are crucial for cellular function and integrity.
  • Ferns provide a model system for studying reproductive cell differentiation.

Purpose of the Study:

  • To investigate changes in plastid and mitochondrial envelope structure during oogenesis in the fern Paesia.
  • To determine the lipid composition and permeability of envelope membranes during egg cell maturation.
  • To understand the functional implications of these changes for metabolic interchange.

Main Methods:

  • Transmission electron microscopy using aldehyde fixation and osmication.
  • Permanganate fixation to assess membrane lipid properties.
  • Analysis of membrane distinctness and reaction to different fixatives.

Main Results:

  • Plastid envelopes showed progressive loss of distinctness after aldehyde fixation and osmication.
  • Plastid envelopes reacted normally to permanganate, suggesting changes in lipid unsaturation.
  • Mitochondrial envelopes remained unchanged throughout oogenesis.
  • Lipid unsaturation in plastid envelope membranes decreased as the fern egg matured.

Conclusions:

  • Decreased lipid unsaturation in plastid envelopes may increase permeability.
  • Enhanced permeability facilitates metabolic interchange between the egg and ground cytoplasm.
  • Observed plastid envelope changes during oogenesis are similar to those in other differentiating reproductive cells (spores, gametes).

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