Fig. 5. Concentrations of (a) glutathione and (b) phytochelatin in roots, new leaves, and old leaves of lettuce grown hydroponically in beakers for at least 14 d with 10, 50, or 100 µM ethylenediaminetetraacetic acid (EDTA). Phytochelatin reported as –glu–cys = 2(n = 2) + 3(n = 3). Error bars represent ±standard error of the mean (number of replicates x = 3).