6533b823fe1ef96bd127e958
RESEARCH PRODUCT
Changes of the Quantum Yield of Oxygen Evolution and the Electron Transport Capacity of Isolated Spinach Thylakoids during Photoinhibition
Aloysius WildMichael RichterBirgit Böthinsubject
PhotoinhibitionbiologyPhysiologyChemistryOxygen evolutionfood and beveragesQuantum yieldPlant Sciencebiology.organism_classificationPhotochemistryPhotosynthesisElectron transport chainElectron transferThylakoidSpinachAgronomy and Crop Sciencedescription
Summary Isolated spinach thylakoids can be protected from photoinhibitory loss of electron transport capacity by the radical defense system composed of the enzymes SOD and catalase, as well as the antioxidants glutathione and ascorbate. With these compounds present at saturating concentrations, thylakoids not only retain a high photochemical capacity but also do not suffer D1-protein degradation during photoinhibition. However, a strong decrease in the quantum yield of oxygen evolution, Φ O 2 , occurs with the same thylakoids. These results support the view that the photochemical capacity and the quantum yield of oxygen evolution decline due to different mechanisms during photoinhibition. The mechanism underlying the loss of Φ O 2 , seems to be temperature-dependent, as Φ O 2 , did not decline below the electron transport capacity during photoinhibition at 0°C.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1992-06-01 | Journal of Plant Physiology |