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Mechanism of Photoactivation of Electron Transport in Intact Bryopsis Chloroplasts ¹

Carnegie Institution of Washington, Stanford, California 94305, Department of Plant Biology, Stanford, California 94305

The mechanism of photoactivation of photosystem I electron transport was studied in intact Bryopsis corticulans chloroplasts. The evidence from chemical and photochemical studies suggests that photoactivation is a consequence of a reduction of an electron transport component, presumably ferredoxin-NADP⁺ reductase. O₂ does not act as a mediator of the process but rather acts as an electron acceptor after photoactivation has occurred. We suggest that the initial function of the chloroplasts in a transition from dark to light is to initiate pseudocyclic electron flow.

¹ Carnegie Institution of Washington/Department of Plant Biology Publication 749.

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