Involvement of state transitions in the switch between linear and cyclic electron flow in Chlamydomonas reinhardtii
Involvement of state transitions in the switch between linear and cyclic electron flow in Chlamydomonas reinhardtii
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DOI：
10.1093/embo-reports/kvf047
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发表时间：
2002-03-01
期刊：
影响因子：
7.7
通讯作者：
Forti, G
中科院分区：
文献类型：
--
作者：
Finazzi, G;Rappaport, F;Forti, G
光合生物的能量代谢受到光系统I周围的状态转换和电子流的深刻影响，前者涉及光系统I和光系统11之间光收集天线的可逆再分配，优化光合作用中的光能利用，后者则调节光合产量。我们使用野生型和三种突变型的莱茵衣藻——锁定在状态I (stt7)，缺乏光系统11外部触角（bf4）或积累了少量的细胞色素b(6)f复合物（A-AUU）——并测量了在状态转换期间通过细胞色素b(6)f复合物的电子流、析氧速率和荧光发射。结果表明，从状态1到状态2的转变诱导了该藻类从线性电子流到循环电子流的转换，并揭示了在状态转变期间天线配合物的重新分布与循环电子流的开始之间存在严格的因果关系。
The energetic metabolism of photosynthetic organisms is profoundly influenced by state transitions and cyclic electron flow around photosystem I. The former involve a reversible redistribution of the light-harvesting antenna between photosystem I and photosystem 11 and optimize light energy utilization in photosynthesis whereas the latter process modulates the photosynthetic yield. We have used the wild-type and three mutant strains of the green alga Chlamydomonas reinhardtii-locked in state I (stt7), lacking the photosystem 11 outer antennae (bf4) or accumulating low amounts of cytochrome b(6)f complex (A-AUU)-and measured electron flow though the cytochrome b(6)f complex, oxygen evolution rates and fluorescence emission during state transitions. The results demonstrate that the transition from state 1 to state 2 induces a switch from linear to cyclic electron flow in this alga and reveal a strict cause-effect relationship between the redistribution of antenna complexes during state transitions and the onset of cyclic electron flow.