NiCl2(ppm) Roots Shoots µg Ni2+ g/DW µg Ni2+ g/DW M.crystallinum     0 4.25  ±  0.49a 2.89  ±  0.16a 25 40.46  ±  0.80b 30.36  ±  0.62b 50 103.39  ±  1.05c 56.35  ±  1.70c 100 370.98  ±  7.73d 78.33  ±  1.45d B.juncea     0 3.45  ±  0.14a 0.84  ±  0.06a 25 42.79  ±  1.48b 17.75  ±  1.32b 50 96.46  ±  1.81c 36.33  ±  0.36c 100 152.63  ±  3.56d 57.11  ±  0.43d

Table 3: Nickel concentration in roots and shoots of M. crystallinum and B. juncea, after 3 months of treatment. Means (n = 6 per treatment ± SE) with at least one same letter are not significantly different at P ≤ 0.05.