Abstract
The paper presents the results of the study of the effect of cadmium (CdSO4) ions on photosystem II (PSII) photochemical activity. The presence of Cd2+ ions in the medium was found to significantly inhibit the oxygen evolution in the thylakoid membranes, indicating a clear correlation between the concentration of Cd2+ ions and the inhibition of PSII photochemical activity. Additionally, the study identified that this inhibition is strongly dependent on the pH level of the medium. The inhibition of PSII photochemical activity occurred quickly at low cadmium concentrations (1.0-30 mM). The study also observed that the inhibition of O2 evolution by Cd2+ ions was time-dependent, with a rapid 20-40% inhibition of oxygen evolution occurring when adding Cd2+. The photochemical activity of PSII was inhibited slowly during long-term incubation. The findings imply that PSII contains at least one high-affinity cadmium binding site. Keywords: Cadmium, photosynthesis, photosystem II, oxygen evolution
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