Short-term acclimation of the photosynthetic electron transfer chain to changing light: a mathematical model

Author:

Ebenhöh Oliver12,Fucile Geoffrey3,Finazzi Giovanni4567,Rochaix Jean-David3,Goldschmidt-Clermont Michel3

Affiliation:

1. Institute for Complex Systems and Mathematical Biology, University of Aberdeen, Meston Building, Old Aberdeen, Aberdeen AB24 3UE, UK

2. Cluster of Excellence on Plant Sciences (CEPLAS), Heinrich-Heine-University, Universitätsstraße 1, D-40225 Düsseldorf, Germany

3. Department of Botany and Plant Biology and Department of Molecular Biology, University of Geneva, 30 quai Ernest Ansermet, Geneva 4, Switzerland

4. Centre National de la Recherche Scientifique, Laboratoire de Physiologie Cellulaire & Végétale, Unité Mixte de Recherche 5168, Grenoble 38054, France

5. Université Grenoble-Alpes, Grenoble 38054, France

6. Commissariat à l'Energie Atomique et Energies Alternatives, Institut de Recherches en Technologies et Sciences pour le Vivant, Grenoble 38054, France

7. Institut National Recherche Agronomique, Unité Sous Contrat 1359, Grenoble 38054, France

Abstract

Photosynthetic eukaryotes house two photosystems with distinct light absorption spectra. Natural fluctuations in light quality and quantity can lead to unbalanced or excess excitation, compromising photosynthetic efficiency and causing photodamage. Consequently, these organisms have acquired several distinct adaptive mechanisms, collectively referred to as non-photochemical quenching (NPQ) of chlorophyll fluorescence, which modulates the organization and function of the photosynthetic apparatus. The ability to monitor NPQ processes fluorometrically has led to substantial progress in elucidating the underlying molecular mechanisms. However, the relative contribution of distinct NPQ mechanisms to variable light conditions in different photosynthetic eukaryotes remains unclear. Here, we present a mathematical model of the dynamic regulation of eukaryotic photosynthesis using ordinary differential equations. We demonstrate that, for Chlamydomonas , our model recapitulates the basic fluorescence features of short-term light acclimation known as state transitions and discuss how the model can be iteratively refined by comparison with physiological experiments to further our understanding of light acclimation in different species.

Publisher

The Royal Society

Subject

General Agricultural and Biological Sciences,General Biochemistry, Genetics and Molecular Biology

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