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Effects of treatments of 5-aminolevulinic acid (ALA) (0, 25 mg L−1) and lead (Pb) (0, 100, and 400 μM) on (a) net photosynthetic rate, (b) stomatal conductance, (c) intercellular CO2 concentration, and (d) transpiration rate of the youngest fully expanded leaf in Brassica napus cv. ZS 758. Values are means of eight readings ± SD. Columns marked with the same lowercase letters are not significantly different by the LSD test at P ≤ 0.05.
