A proportion of photosystem II core complexes are decoupled from the phycobilisome in light‐state 2 in the cyanobacterium Synechococcus 6301

FEBS Letters

Mullineaux, Conrad W.¹  Holzwarth, Alfred R.¹ 

[1] Max-Planck-Institut für Strahlenchemie, Stiftstrasse 34-36, D-4330 Mülheim an der Ruhr 1, FRG

关键词: Photosynthesis;    Photosystem II;    Phycobilisome;    Fluorescence induction;    State 1-state 2 transition;    Light harvesting;    (Synechococcus 6301);    Chl;    chlorophyll;    DCMU;    3-(3';    4'-dichlorophenyl)-1;    1-dimethylurea;    Fo;    level of fluorescence when all PS II centres are open;    Fm;    level of fluorescence when all PS II centres are closed;    Fv;    variable fluorescence (Fv = Fm-Fo);    PBS;    phycobilisome;    PS;    photosystem;   

DOI  :  10.1016/0014-5793(90)80114-X

学科分类：生物化学/生物物理

来源: John Wiley & Sons Ltd.

【 摘 要 】

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 cells 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.

【 授权许可】

Unknown