THE MECHANISM OF PHOTOSYNTHETIC OXYGEN EVOLUTION - A STUDY OF THE PRIMARY PHOTOREACTIONS AND OF ELECTRON CARRIERS
The process of oxygen evolution in green plants is realized by the so-called Photosystem-II, a complex ensemble of pigments, of electron carriers and of lipoproteins, whose composition and structure are poorely known. Its electron transfer chain can be schematized as: OEC --> D-1 --> P-680 --> I --> Q-A --> Q-B (P-680: primary electron donor; I : intermediary acceptor; Q-A, Q-B : specialized plastoquinones; D-1 : first secondary donor ; OEC : oxygen evolving complex ; the arrows represent electron transfers). The research aimed at increasing our knowledge on this complex (its chemical composition, its structure, its reaction mechanisms), by the way of spectroscopic and physico-chemical studies on the intact chloroplast on chloroplast particles. The results concern the electron acceptors (I, Q-A, Q-B), a newly evidenced donor (a molecule of carotenoid) and triplet states formed by charge recombination. The first study concerned electron donation from a carotenoid to the PS-II reaction center. A detailed analysis of this electron transfer has been made. A second study dealt with the triplet state of the primary donor (3-P-680) which is formed after charge recombination between P-680**+ and I**-.
Bibliographic Reference: EUR 9274 EN (1984) MF, 58 P., BFR 120, BLOW-UP COPY BFR 290, EUROFFICE, LUXEMBOURG, POB 1003
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Record Number: 1989122099300 / Last updated on: 1987-01-01
Available languages: en