Action of Bicarbonate on Photosynthetic Electron Transport in the Presence or Absence of Inhibitory Anions

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Abstract

Bicarbonate (or CO2) was shown by Warburg and Krippahl [1] to stimulate electron transport during the Hill reaction. This phenomenon has been referred to as the bicarbonate (HCO3 ) effect. The electron transport chain can be dissected into a number of clearly defined partial reactions through the addition of specific inhibitors and electron donors and acceptors. By applying this approach (see e.g., [2, 3]) the HCO3 effect has been shown to be associated with the acceptor side of Photosystem II (PS II): 1 $${{H}_{2}}O\to OEC\to Z\to P680\to Pheo\to {{Q}_{A}}\to {{Q}_{B}}\to PQ$$