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Effects of 10–30% PEG treatments on the photosynthesis-related parameters of sweet sorghum. (A) Net photosynthesis rate; (B) stomatal conductance; (C) intercellular CO2 concentration; (D) transpiration rate; (E) water-use efficiency; (F) total chlorophyll content. Data are means (±SDs), n = 6. Different letters indicate significant differences determined by Tukey’s HSD test (p < 0.05).
