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Changes in maximum efficiency of PSII photochemistry (Fv/Fm, A), non-photochemical quenching (NPQ, B), chlorophyll content (C) and carotenoid content (D) in 10 maize lines during drought stress and re-watering. Data represent the mean ± SD (n = 5). Asterisks indicate statistically significant differences between treatments (*P ≤ 0.05).
