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The relationship between the ΦNPQ in the dark and the state transition. The degree of state transition was estimated as the difference in the ratio of PSI fluorescence and PSII fluorescence determined at 77 K between the dark-acclimated condition and the State 1-induced condition. Mean values of at least three independent measurements and their respective SD are presented. The line in the figure represents the linear fitting result (R2 = 0.95).
