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Spatial patterns in a photobiochemical system.

M Aon1, D Thomas, J F Hervagault

  • 1Unité Associée no. 523 du Centre National de la Recherche Scientifique, Université de Compiègne, Boite Postale 649, 60206 Compiègne, France.

Proceedings of the National Academy of Sciences of the United States of America
|January 1, 1989
PubMed
Summary

Illumination induced a 1D banded pattern in a thylakoid suspension with an electron acceptor gradient. This pattern formation, dependent on reaction-diffusion, was abolished when the water-splitting system was inhibited.

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Area of Science:

  • Biophysics
  • Biochemistry
  • Photosynthesis Research

Background:

  • Thylakoid membranes are crucial for light-dependent reactions in photosynthesis.
  • Understanding self-organization in biological systems is key to deciphering complex cellular processes.
  • Electron acceptors play vital roles in biological redox reactions.

Purpose of the Study:

  • To investigate pattern formation in a thylakoid suspension under specific conditions.
  • To explore the role of reaction-diffusion mechanisms in biological self-organization.
  • To determine the influence of electron acceptor gradients and thylakoid concentration on spatial pattern development.

Main Methods:

  • A homogeneous suspension of thylakoids in a vertical tube was subjected to illumination.

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  • An imposed linear concentration gradient of 2,6-dichloroindophenol (an electron acceptor) was utilized.
  • The water-splitting system of thylakoids was inhibited using heat or methylamine to assess reaction dependence.

    • Main Results:

    • Illumination generated a time-dependent, one-dimensional banded pattern of the electron acceptor.
    • Pattern formation was observed only within specific parameters of the electron acceptor gradient and thylakoid concentration.
    • Inhibition of the water-splitting system eliminated the spatial periodicity, indicating reaction dependence.

    Conclusions:

    • The observed self-organized redox transition of 2,6-dichloroindophenol suggests a reaction-diffusion mechanism is primarily responsible for pattern formation.
    • Pattern characteristics, including the number of bands, can be modulated by adjusting gradient parameters and thylakoid concentration.
    • This study provides insights into the physical and chemical factors governing pattern formation in biological suspensions.