Comparison of diuron- and phenol-Type inhibitors aditional inhibitory action at the photosystem II Donor site

Abstract

Inhibitors of photosystem II reactions from the “diuron-type” and “phenol-type” have been compared regarding their mechanism of action. “Diuron-” as well as “phenol-type” inhibitors act at the acceptor site of photosystem II by displacing the secondary acceptor quinone QB from its binding site. “Phenol-type” inhibitors additionally interfere with the donor site, which is demonstrated in studies of chlorophyll fluorescence and luminescence. This mechanism of action is shown to be similar but not identical to that reported for hydroxylamine. © 1984, Walter de Gruyter. All rights reserved.