| Autor: |
Cerović, Zoran G., Kalezić, Radmila, Plesničar, Marijana |
| Zdroj: |
Planta; December 1982, Vol. 156 Issue: 3 p249-254, 6p |
| Abstrakt: |
Sulphur dioxide inhibits noncyclic photophosphorylation in isolated envelope-free chloroplasts. This inhibition was shown to be reversible and competitive with phosphate, with an inhibitor constant of Ki=0.8mM. The same inhibition characteristics were observed when phosphoglycerate (PGA)- or ribulose-1,5-bisphosphate (RuBP)-dependent oxygen evolution was examined in a reconstituted chloroplast system in the presence of SO32-. Using an ATP-regenerating system (phosphocreatine-creatine kinase), it was demonstrated that the inhibition of PGA-dependent oxygen evolution is solely the result of inhibited photophosphorylation. It is concluded that at low SO2 and SO32-concentrations the inhibition of photophosphorylation is responsible for the inhibition of photosynthetic oxygen evolution. |
| Databáze: |
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| Externí odkaz: |
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