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Light intensity dependence of PSI redox state at 6 and 25°C. (A) Y(I), the quantum yield of PSI photochemistry. (B) Y(ND), the quantum yield of PSI non-photochemical energy dissipation due to the donor-side limitation. (C) Y(NA), the quantum yield of PSI non-photochemical energy due to the acceptor-side limitation. Values are means ± SE (n = 4). Asterisks indicate a significant difference between 6 and 25°C.
