Photosynthetic and respiratory electron transport in the alkaliphilic cyanobacterium Arthrospira (Spirulina) platensis

被引:28
作者
Berry, S
Bolychevtseva, YV
Rögner, M
Karapetyan, NV
机构
[1] Ruhr Univ Bochum, Fac Biol, D-44780 Bochum, Germany
[2] Russian Acad Sci, AN Bakh Biochem Inst, Moscow, Russia
基金
俄罗斯基础研究基金会;
关键词
fluorescence; proton translocation; sodium;
D O I
10.1023/A:1026012719612
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Photosynthetic and respiratory electron transport and their interplay with ion transport have been studied in Arthrospira platensis, a filamentous alkaliphilic cyanobacterium living in hypersaline lakes. As typical for alkaliphiles, A. platensis apparently does not maintain an outward positive pH gradient at its plasma membrane. Accordingly, sodium extrusion occurs via an ATP-dependent primary sodium pump, in contrast to the Na+/H+ antiport in most cyanobacteria. A. platensis is strongly dependent on sodium/bicarbonate symport for the uptake of inorganic carbon. Sodium extrusion in the presence of the Photosystem II inhibitor diuron indicates that a significant amount of ATP is supplied by cyclic electron transport around Photosystem I, the content of which in A. platensis is exceptionally high. Plastoquinol is oxidized by two parallel pathways, via the cytochrome b(6)f complex and a putative cytochrome bd complex, both of which are active in the light and in the dark.
引用
收藏
页码:67 / 76
页数:10
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