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The plastoquinone (PQ)‐pool in chloroplast thylakoid membranes is a key electron carrier in the photosynthetic electron transport chain (PETC), and its redox state plays an essential role in the control of plant metabolism. Oxygen reduction in thylakoid membranes produces superoxide anion radicals ( ), which may react with the PQ‐pool. Here, using isolated thylakoids, we show for the first time...
O 2 reduction was investigated in photosystem I (PSI) complexes isolated from cyanobacteria Synechocystis sp. PCC 6803 wild type (WT) and menB mutant strain, which is unable to synthesize phylloquinone and contains plastoquinone at the quinone-binding site A 1 . PSI complexes from WT and menB mutant exhibited different dependencies of O 2 reduction on light intensity, namely,...
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