Mechanism of photoactivation of electron transport in intact bryopsis chloroplasts |
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Authors: | Satoh K |
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Affiliation: | Carnegie Institution of Washington, Stanford, California 94305. |
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Abstract: | 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. |
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