Resistance of Photosynthesis to Hydrogen Peroxide in Algae : ENVIRONMENTAL AND STRESS RESPONSES : PROTEINS, ENZYMES AND METABOLISM :

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Abstract

The effects of H_2O_2 On the photosynthetic fixation of CO_2 and on thiol-modulated enzymes involved in the photosynthetic reduction of carbon in algae were studied in a comparison with those in chloroplasts isolated from spinach leaves. In both systems, H_2O_2-scavenging enzymes were inhibited by addition of 0.1 mM NaN_3 1 h prior to the addition of H_2O_2・ A concentration (10^<-4> M) of H_2O_2 caused strong inhibition of the CO_2 fixation by intact spinach chloroplasts, as observed by Kaiser [(1976) Biochim. Biophys. Acta 440: 476] , but not that by Euglena and Chlamydomonas cells. The same results were also obtained with cells of the cyanobacteria Synechococcus PCC 7942 and Synechocystis PCC 6803 in the presence of 1 mM hydroxylamine. These results indicate that algal photosynthesis is rather resistant to H_2O_2. The insusceptibility to H_2O_2 Of thiol-modulated enzymes, namely, fructose-1,6-bisphosphatase, NADP-glyceraldehyde-3-phosphate dehydrogenase, and ribulose-5-phosphate kinase, was also observed in the chloroplasts of Euglena and Chlamydomonas and in cyanobacterial cells. It seems likely that the resistance of photosynthesis to H_2O_2 is due in part to the insusceptibility of the algal thiol-modulated enzymes to H_2O_2.

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