Light adaptation of cyclic electron transport through Photosystem I in the cyanobacterium Synechococcus sp PCC 7942

被引:56
作者
Herbert, SK [1 ]
Martin, RE [1 ]
Fork, DC [1 ]
机构
[1] CARNEGIE INST WASHINGTON, DEPT PLANT BIOL, STANFORD, CA 94305 USA
关键词
cyanobacteria; cyclic electron transport; photoacoustic spectroscopy; photoadaptation; photoinhibition; Photosystem I;
D O I
10.1007/BF00020441
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Photosystem I-driven cyclic electron transport was measured in intact cells of Synechococcus sp PCC 7942 grown under different light intensities using photoacoustic and spectroscopic methods. The light-saturated capacity for PS I cyclic electron transport increased relative to chlorophyll concentration, PS I concentration, and linear electron transport capacity as growth light intensity was raised. In cells grown under moderate to high light intensity, PS I cyclic electron transport was nearly insensitive to methyl viologen, indicating that the cyclic electron supply to PS I derived almost exclusively from a thylakoid dehydrogenase. In cells grown under low light intensity, PS I cyclic electron transport was partially inhibited by methyl viologen, indicating that part of the cyclic electron supply to PS I derived directly from ferredoxin. It is proposed that the increased PS I cyclic electron transport observed in cells grown under high light intensity is a response to chronic photoinhibition.
引用
收藏
页码:277 / 285
页数:9
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