Fig. 7.

Concentration of Cd and Zn in shoots and roots of 35S:CKX2 transgenic B. napus plants grown on contaminated substrate. a Metal concentrations in shoots and roots of three-week-old plants grown in a hydroponic culture supplemented with 5 μM Cd or 50 μM Zn. b Metal concentrations in shoots and roots of six-week-old plants grown in soil containing 10 mg kg^− 1 Cd and 1100 mg kg^− 1 Zn. Data represent mean values ± SD (n = 9–10). Student’s t-test was used to calculate the significance of differences in metal concentration between transgenic lines and wild type. * p < 0.05; ** p < 0.01; *** p < 0.001; ND, not determined