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首页> 外文期刊>Journal of Experimental Botany >The enhancement of cyclic electron flow around photosystem I improves the recovery of severely desiccated Porphyra yezoensis (Bangiales, Rhodophyta).
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The enhancement of cyclic electron flow around photosystem I improves the recovery of severely desiccated Porphyra yezoensis (Bangiales, Rhodophyta).

机译：在照相系统周围的循环电子流量的增强我改善了严重干燥的卟啉酵母（Bangiales，肾小球）的回收。

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摘要

Porphyra yezoensis, a representative species of intertidal macro-algae, is able to withstand periodic desiccation at low tide but is submerged in seawater at high tide. In this study, changes in photosynthetic electron flow in P. yezoensis during desiccation and re-hydration were investigated. The results suggested that the cyclic electron flow around photosystem I (PSI) increased significantly during desiccation, continued to operate at times of severe desiccation, and showed greater tolerance to desiccation than the electron flow around PSII. In addition, PSI activity in desiccated blades recovered faster than PSII activity during re-hydration. Even though linear electron flow was suppressed by DCMU [3-(3',4'-dichlorophenyl)-1,1-dimethylurea], cyclic electron flow could still be restored. This process was insensitive to antimycin A and could be suppressed by dibromothymoquinone (DBMIB). The prolonged dark treatment of blades reduced the speed in which the cyclic electron flow around PSI recovered, suggesting that stromal reductants, including NAD(P)H, played an important role in the donation of electrons to PSI and were the main cause of the rapid recovery of cyclic electron flow in desiccated blades during re-hydration. These results suggested that cyclic electron flow in P. yezoensis played a significant physiological role during desiccation and re-hydration and may be one of the most important factors allowing P. yezoensis blades to adapt to intertidal environments.
机译：Porphyra yezoensis是透模性缺点的代表性物种，能够在低潮中经受定期干燥，但在高潮中浸没在海水中。在该研究中，研究了在干燥和再水合过程中P. yezoensis的光合电子流动的变化。结果表明，在干燥过程中，光系统I（PSI）周围的循环电子流量显着增加，继续在严重干燥的时间内操作，并且比PSII周围的电子流动表现出更大的耐受性。另外，在再水合过程中，干燥叶片中的PSI活性比PSII活性更快地回收。即使通过DCMU抑制线性电子流动[3-（3'，4'-二氯苯基）-1,1-二甲基脲]，仍然可以恢复循环电子流动。该方法对抗霉素A不敏感，并且可以通过Dibromothymoquinone（DBMIB）抑制。叶片的延长暗暗处理降低了PSI周围的循环电子流量的速度，这表明基质还原剂（包括NAD（P）H）在捐赠电子到PSI中发挥了重要作用，并且是快速的主要原因再水合过程中干燥叶片中循环电子流的回收。这些结果表明，yezoensis中的循环电子流量在干燥和再水合过程中发挥了显着的生理作用，并且可以是允许P. yezoensis刀片适应透模环境的最重要因素之一。

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