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Effect of different Pb concentrations (0, 300, and 600 mg kg−1) and CA levels (0, 2.5, and 5 mM) on transpiration rate (A), photosynthetic rate (B), stomata conductance (C), water use efficiency (D) of castor beans plants. Values reported in figures are the mean of 3 replicates along with standard deviation. Letters shows the significant difference between the treatments of p ≤ 0.05.
