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- W3015175345 abstract "In this study, we have compared photosynthetic regulation in tobacco leaves (Nicotiana tabacum L.) grown under high light (HL) and low light (LL) by measuring chlorophyll fluorescence, P700 redox state and electrochromic shift signals. Under high light, HL-plants had much higher linear electron flow and cyclic electron flow (CEF) around photosystem I (PSI) than LL-plants. Meanwhile, HL-plants showed significantly lower proton gradient (ΔpH) across the thylakoid membranes, owing to the increased activity of chloroplast ATP synthase. The relationships between ΔpH, non-photochemical quenching (NPQ) and PSI donor side limitation [Y(ND)] differed between HL- and LL-plants. At a given ΔpH, HL-plants displayed higher NPQ and Y(ND). Furthermore, at a given CEF, LL-plants showed higher ΔpH and Y(ND). These results indicate that HL-plants down-regulate ΔpH to increase light use efficiency by enhancing the activity of chloroplast ATP synthase. In contrast, LL-plants decrease the activity of chloroplast ATP synthase to up-regulate ΔpH and to favor photoprotection. Our findings suggest that the coordination of CEF and chloroplast ATP synthase balances light use efficiency and photoprotection at different growth light conditions." @default.
- W3015175345 created "2020-04-10" @default.
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- W3015175345 date "2020-07-01" @default.
- W3015175345 modified "2023-10-16" @default.
- W3015175345 title "Balancing light use efficiency and photoprotection in tobacco leaves grown at different light regimes" @default.
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- W3015175345 doi "https://doi.org/10.1016/j.envexpbot.2020.104046" @default.
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