Stimulation of a cyclic electron‐transfer pathway around photosystem II by phosphorylation of chloroplast thylakoid proteins

[摘要]

Fluorescence induction kinetics of phosphorylated and unphosphorylated chloroplast thylakoid membranes have been studied under low light intensity. Hydroxylamine is able to enhance the fluorescence yield to a greater extent in phosphorylated membranes in both the presence and absence of DCMU. Examination of the light intensity dependence of the fluorescence yields leads to the conclusion that protein phosphorylation enhances the efficiency of a NH₂OH-sensitive cyclic electron-transfer pathway around photosystem II.

[学科分类] 生物化学/生物物理

[关键词] Photosynthesis;Chloroplast;Protein phosphorylation;Thylakoid;Photosystem;Chlorophyll fluorescence;PSII;photosystem II;PSI;photosystem I;Q;the primary acceptor of PSII whose redox state controls the yield of fluorescence;F o;the level of fluorescence when Q is oxidised;F mv;F m-F o;the variable fluorescence;DCMU;3-(3;4-dichlorophenyl)-1;1-dimethylurea;LHC-II;the light harvesting complex associated with PSII