Abstract
The oxygen evolved by Chlamydomonas reinhardtii in the light is measured simultaneously with a Clark electrode and with the nitrosodimethylaniline-imidazole colorimetric method which is specific for singlet oxygen. Experiments with wild-type and FuD7 mutant cells (unable to synthesize the D1 protein of Photosystem II), with dichlorophenyldimethylurea (which blocks electron transfer from Photosystem II to Photosystem I) and with dibromothymoquinone (which diverts electrons from their normal path between the two photosystems), as well as with hydroxylamine (an inactivator of the water-splitting part of Photosystem II and a competitor of water for electron donation to it), all point to the dependence of detected singlet oxygen on photolysis of water by Photosystem II.
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Abbreviations
- DBMIB:
-
Dibromothymoquinone
- DCMU:
-
Dichlorophenyldimethylurea
- PS I and PS II:
-
Photosystems I and II
- RNO:
-
para-nitrosodimethylaniline
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Contribution of the Centre interdisciplinaire de Biochimie de Oxygène.
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Roudyk, S.N., Moxhet, A., Matagne, R.F. et al. Evidence of singlet oxygen evolution by whole living cells of Chlamydomonas reinhardtii . Photosynth Res 47, 99–102 (1996). https://doi.org/10.1007/BF00017757
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DOI: https://doi.org/10.1007/BF00017757