期刊
PLANT SCIENCE
卷 305, 期 -, 页码 -出版社
ELSEVIER IRELAND LTD
DOI: 10.1016/j.plantsci.2021.110828
关键词
Photosynthesis; Electron transfer; Photosystem I; Photoprotection; Dendrobium officinale
资金
- National Natural Science Foundation of China [31971412]
- Key Research and Development Program of Yunnan Province [2018BB010]
- Science Research of Yunnan Provincial Department of Education [2019J1068]
- Beijing DR PLANT Biotechnology Co., Ltd
The study demonstrates that the water-water cycle (WWC) can effectively assist the photosystem I (PSI) in responding to light changes at room temperature, but this mechanism is not applicable at low temperatures.
The water-water cycle (WWC) has the potential to alleviate photoinhibition of photosystem I (PSI) in fluctuating light (FL) at room temperature and moderate heat stress. However, it is unclear whether WWC can function as a safety valve for PSI in FL at chilling temperature. In this study, we measured P700 redox state and chlorophyll fluorescence in FL at 25 degrees C and 4 degrees C in the high WWC activity plant Dendrobium officinale. At 25 degrees C, the operation of WWC contributed to the rapid re-oxidation of P700 upon dark-to-light transition. However, such rapid reoxidation of P700 was not observed at 4 degrees C. Upon a sudden increase in light intensity, WWC rapidly consumed excess electrons in PSI and thus avoided an over-reduction of PSI at 25 degrees C. On the contrary, PSI was highly reduced within the first seconds after transition from low to high light at 4 degrees C. Therefore, in opposite to 25 degrees C, the WWC is not a major alternative sink in FL at chilling temperature. Upon transition from low to high light, cyclic electron transport was highly stimulated at 4 degrees C when compared with 25 degrees C. These results indicate that D. officinale enhances cyclic electron transport to partially compensate for the inactivation of WWC in FL at 4 degrees C.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据