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Activity of PSI of three maize hybrids when two-week-old plants were subjected to three cycles of drought stress. (a) Effective quantum yield of photosystem I [Y(I)] (b) fraction of overall P700 that is oxidized in a given state [Y(ND)] (c) Fraction of overall P700 that cannot be oxidized in a given state [Y(NA)]. Blue lines are control, red lines with markers are water stress. Bars represent the calculated standard error (n = 4).
