Dichromate effect on energy dissipation of photosystem II and photosystem I in Chlamydomonas reinhardtii
| Autor: | François Perreault, Philippe Juneau, Radovan Popovic, Cyril Saison, Nadia Ait Ali |
|---|---|
| Rok vydání: | 2009 |
| Předmět: |
Chlorophyll
Photosystem II Biophysics Plastoquinone macromolecular substances Photosystem I Photochemistry Electron Transport chemistry.chemical_compound polycyclic compounds Animals Radiology Nuclear Medicine and imaging Potassium dichromate Photosystem Fluorescent Dyes Radiation P700 Radiological and Ultrasound Technology Photosystem I Protein Complex Cytochrome b6f complex food and beverages Photosystem II Protein Complex Light-harvesting complexes of green plants chemistry Potassium Dichromate Energy Metabolism Chlamydomonas reinhardtii Water Pollutants Chemical |
| Zdroj: | Journal of photochemistry and photobiology. B, Biology. 96(1) |
| ISSN: | 1873-2682 |
| Popis: | In this study, we investigated the energy dissipation processes via photosystem II and photosystem I activity in green alga Chlamydomonas reinhardtii exposed to dichromate inhibitory effect. Quantum yield of photosystem II and also photosystem I were highly decreased by dichromate effect. Such inhibition by dichromate induced strong quenching effect on rapid OJIP fluorescence transients, indicating deterioration of photosystem II electron transport via plastoquinone pool toward photosystem I. The decrease of energy dissipation dependant on electron transport of photosystem II and photosystem I by dichromate effect was associated with strong increase of non-photochemical energy dissipation processes. By showing strong effect of dichromate on acceptor side of photosystem I, we indicated that dichromate inhibitory effect was not associated only with PSII electron transport. Here, we found that energy dissipation via photosystem I was limited by its electron acceptor side. By the analysis of P700 oxido-reduction state with methylviolagen as an exogenous PSI electron transport mediator, we showed that PSI electron transport discrepancy induced by dichromate effect was also caused by inhibitory effect located beyond photosystem I. Therefore, these results demonstrated that dichromate has different sites of inhibition which are associated with photosystem II, photosystem I and electron transport sink beyond photosystems. |
| Databáze: | OpenAIRE |
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