The Xanthophyll Cycle of Higher Plants: Function of Chlorophyll a/b Binding Proteins and Membrane Stacking

Dynamics of Xanthophyll-Cycle Activity in Different Antenna Subcomplexes in the Photosynthetic Membranes of Higher Plants (The Relationship between Zeaxanthin Conversion and Nonphotochemical Fluorescence Quenching)

“…The concerted down-regulation of both the recovery of qI and Zea epoxidation with increasing degrees of photoinhibition implied a very close relation of both parameters (Jahns and Miehe, 1996). In vitro experiments with isolated thylakoids established that the reduction of the epoxidation rate (and of qI relaxation) was not attributable to a maintained transmembrane proton gradient under these conditions (Farber and Jahns, 1995), as might have been expected from other studies (Gilmore and Bjorkman, 1994a, 199413). The close relation of qI relaxation and Zea epoxidation could then be based either on a coregulation of epoxidase activity and recovery from photoinhibition or, as proposed for the qE mechanism of qN, on a direct or indirect function of Zea in qI.…”