Journal
BIOSCIENCE BIOTECHNOLOGY AND BIOCHEMISTRY
Volume 78, Issue 3, Pages 384-393Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/09168451.2014.882745
Keywords
alternative electron flow; cyanobacteria; oxygen; photorespiration; photosynthesis
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To determine whether alternative electron flow (AEF) can replace the photosynthetic electron flow in cyanobacteria, we used an open O-2-electrode system to monitor O-2-exchange over a long period. In air-grown Synechocystis sp. PCC 6803 (S. 6803 (WT)), the quantum yield of PSII, Y(II), held even after photosynthesis was suppressed by CO2 shortage. The S. 6803 mutant, deficient in flavodiiron (FLV) proteins 1 and 3, showed the same phenotype as S. 6803(WT). In contrast, Y(II) decreased in Synechococcus sp. PCC 7942 (S. 7942). These results suggest that AEF functioned as the Y(II) in S. 6803 and replaced the photosynthetic electron flux. In contrast, the activity of AEF in S. 7942 was lower. The affinity of AEF for O-2 in S. 6803 did not correspond to those of FLVs in bacteria or terminal oxidases in respiration. AEF might be driven by photorespiration.
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