A proportion of photosystem II core complexes are decoupled from the phycobilisome in light-state 2 in the cyanobacteriumSynechococcus6301

Conrad W. Mullineaux, Alfred R. Holzwarth
1990 FEBS Letters  
Cells of Synechococcus 6301 were briefly exposed to a phycocyanin-absorbed light in the presence of DCMU. PS II trap closure was then estimated from fluorescence induction measurements with excitation light absorbed predominantly either by chlorophyll or by phycocyanin. In cells adapted to light-state 2, the exposure to light absorbed by phycocyanin closed only a proportion of the PS II centres that could be closed by exposure to light absorbed by chlorophyll. This distinction was reduced in
more » ... ls adapted to light-state 1. We conclude that a proportion of PS II core complexes become decoupled from the phycobilisomes during the transition to light-state 2.
doi:10.1016/0014-5793(90)80114-x fatcat:7p2ap4uipfdxdgr7th6grzon2i