Abstract
Upon a sudden transition from high to low light, the rate of CO2 assimilation (AN) in some plants first decreases to a low level before gradually becoming stable. However, the underlying mechanisms remain controversial. The activity of chloroplast ATP synthase (gH+) is usually depressed under high light when compared with low light. Therefore, we hypothesize that upon a sudden transfer from high to low light, the relatively low gH+ restricts ATP synthesis and thus causes a reduction in AN. To test this hypothesis, we measured gas exchange, chlorophyll fluorescence, P700 redox state, and electrochromic shift signals in Bletilla striata (Orchidaceae). After the transition from saturating to lower irradiance, AN and ETRII decreased first to a low level and then gradually increased to a stable value. Within the first seconds after transfer from high to low light, gH+ was maintained at low levels. During further exposure to low light, gH+ gradually increased to a stable value. Interestingly, a tight positive relationship was found between gH+ and ETRII. These results suggested that upon a sudden transition from high to low light, AN was restricted by gH+ at the step of ATP synthesis. Taken together, we propose that the decline in AN upon sudden transfer from high to low light is linked to the slow kinetics of chloroplast ATP synthase.
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Acknowledgements
This study was supported by the National Natural Science Foundation of China (Grant No. 31670343), the Youth Innovation Promotion Association of the Chinese Academy of Sciences (Grant No. 2016347) and the Cultivating Plan Program for the Leader in Science and Technology of Yunnan Province (Grant No. 2016HA005).
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Yang, YJ., Zhang, SB., Wang, JH. et al. The decline in photosynthetic rate upon transfer from high to low light is linked to the slow kinetics of chloroplast ATP synthase in Bletilla striata. Photosynth Res 144, 13–21 (2020). https://doi.org/10.1007/s11120-020-00725-y
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DOI: https://doi.org/10.1007/s11120-020-00725-y