Abstract
In this paper we describe the construction of an in vitro photoelectrochemical model of the Z scheme in green plant photosynthesis. PS I- and PS II-enriched particles from spinach chloroplasts are used in a three-compartment photoelectrochemical cell. Specific acceptors and donors for the two photosystems are employed in this cell in order to reproduce in each compartment the reactions occurring in the different branches of the Z scheme. The three-cell compartments respectively correspond to the branches: 1. the dark oxidation of water by P680 + to evolve oxygen: 2. the photoreduction of an electron acceptor by the P680 light reaction followed by 3. the dark oxidation of an electron donor by P700 +, and 4. the photoreduction of NADP + by the P700 hght reaction. The reaction sequences 1–2a and 2b–3 can occur independently in the presence of suitable acceptors and donors. However, the photochemical yields are shown to improve significantly when the two light reactions are allowed to operate in series.
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