Abstract
Measurements of O 2 exchange have been performed as a function of light intensity in the green alga Chlamydomonas reinhardtii by using 18O 2, and mass spectrometry. The Kok effect (i.e. a decrease in the slope of net O 2 exchange curve) was observed at a light intensity of about 15 μE·m −2·s −1. This effect was due to the inhibition by light of O 2 uptake. In conditions where mitochondrial respiration was inhibited by antimycin A and salicyl hydroxamic acid, illumination was found to reduce O 2 uptake to the same extent as in the control experiment. We conclude that the Kok effect in Chlamydomonas is not the consequence of the inhibition of mitochondrial respiration, but is due to the inhibition of chlororespiration induced by photosystem I activity.
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