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Analysis of PSII photochemistry of three maize hybrids when two-week-old plants were subjected to three cycles of drought stress. (a) Effective quantum yield of electron transport at PSII [Y(II)]; (b) Electron transport rate through photosystem II [ETR(II)]; (c) Nonphotochemical quenching (NPQ). Blue lines are control, red lines with markers are water stress. Bars represent the calculated standard error (n = 4).
