Figure 4.

Metal concentrations in Col-0, chl1.5, and nrt1.1-1 plants. Plants were precultured as described in Figure 1 for 5 weeks, and then were transferred to complete nutrient solution containing 10 μm CdCl₂ for 7 d, after which the metal concentrations in the roots and shoots were measured. A, Cadmium concentration. B, Iron concentration. C, Calcium concentration. D, Potassium concentration. Bars represent the sd (n = 5 biological replicates). Asterisks indicate significant differences compared with the Col-0 plants (*P < 0.05, **P < 0.01, ***P < 0.001; two-tailed Student’s t test). DW, Dry weight.