Abstract

Depletion of carbon dioxide from cells by formate treatment not only causes a cessation of carbon dioxide fixation, but also a dramatic decrease in the rate of electron transfer between QA, the primary plastoquinone electron acceptor of photosystem II, and the cytochrome b6/f complex. We show here that this latter phenomenon can be conveniently monitored by the antagonistic effects of light absorbed in photosystems I and II on chlorophyll a fluorescence yield and P700 turnover in intact cells of green algae and cyanobacteria.

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