Inhibition of photosystem ii by UV-B-radiation

Abstract

The effect of UV-B-radiation on PSII activity of spinach chloroplasts was analyzed by measuring the integrity of the herbicide-binding protein (HBP 32), by measurement of fluorescence induction in the presence of Diuron (DCMU), and by mathematical analysis ofthe fluorescence induction curves.It was shown that UV-B inactivates the PSII α-centers but not PSII β-centers.However, the possibility cannot be excluded that in addition the donor site o f PSII near the reaction center is attacked by UV-B-radiation. © 1985, Walter de Gruyter. All rights reserved.