NiCl2(μM)   0 25 50 100 Ca2+  μg/g DW M.crystallinum Shoots 15.34 ± 1.03a 16.22 ± 1.02b 20.10 ± 1.76c 20.31 ± 1.05d Roots 34.51 ± 0.38a 5.35 ± 0.15c 6.93 ± 0.21c 16.55 ± 0.42b B.juncea Shoots 12.62 ± 0.80c 14.52 ± 0.31b 16.73 ± 0.22b 24.61 ± 0.54a Roots 5.88 ± 0.16b 5.40 ± 0.14b 6.29 ± 0.06b 8.00 ± 0.20a Mg2+  μg/g DW M.crystallinum Shoots 5.41 ± 0.27a 4.95 ± 0.01a 5.28 ± 0.12a 5.87 ± 0.16a Roots 3.26 ± 0.01b 1.79 ± 0.08c 2.53 ± 0.46b 5.22 ± 0.69a B.juncea Partie aérienne 2.73 ± 0.17b 2.75 ± 0.13b 3.50 ± 0,03b 5.17 ± 0.03a Roots 1.76 ± 0.06b 1.80 ± 0.05b 2.11 ± 0.02b 3.37 ± 0.10a K+  μg/g DW M.crystallinum Shoots 32.29 ± 1.55a 23.80 ± 0.33b 26.68 ± 0.67ab 28.01 ± 0.23a Roots 30.90 ± 0,29a 11.91 ± 0,13b 10.03 ± 0.26b 11.74 ± 0.63b B.juncea Shoots 21.11 ± 1.31a 21.46 ± 0.39a 17.05 ± 0.23b 22.69 ± 0.38a Roots 10.01 ± 0.26a 11.09 ± 0.31a 9.45 ± 0.14ab 12.63 ± 0.42a Fe2+  μg/g DW M.crystallinum Shoots 0.48 ± 0.02a 0.40 ± 0.01a 0.32 ± 0.01b 0.28 ± 0.03b Roots 3.09 ± 0.02b 1.72 ± 0.05c 2.81 ± 0.53b 5.36 ± 0.79a B.juncea Shoots 0.17 ± 0.01b 0.34 ± 0.02a 0.21 ± 0.01b 0.35 ± 0.02a Roots 1.89 ± 0.08b 2.28 ± 0.05b 2.49 ± 0.06b 4.33 ± 0.12a Mn2+  μg/g DW M.crystallinum Shoots 32.71 ± 1.90a 20.05 ± 0.11b 30.58 ± 0.51a 30.42 ± 0.75a Roots 24.32 ± 0.07a 14.13 ± 0.37b 20.64 ± 1.01a 29.95 ± 6.34a B.juncea Shoots 20.53 ± 1.64c 34.40 ± 2.22b 29.63 ± 0.01b 42.65 ± 0.27a Roots 15.93 ± 0.44b 15.11 ± 0.89b 19.64 ± 0.58a 22.88 ± 0.47a Mo2+  μg/g DW M.crystallinum Shoots 3.57 ± 0.40a 3.33 ± 0.11b 3.00 ± 0.07b 2.94 ± 0.12b Roots 25.70 ± 2.88a 9.59 ± 0.31ab 4.08 ± 0.54b 3.73 ± 0.26b B.juncea Shoots 3.49 ± 0.23b 3.27 ± 0.13b 3.68 ± 0.03b 4.45 ± 0.10a Roots 4.39 ± 0.10a 3.65 ± 0.17b 3.63 ± 0.01b 4.49 ± 0.04a Zn2+  μg/g DW M.crystallinum Shoots 41.45 ± 2.35a 19,50 ± 0.38b 19.87 ± 0.16b 13.13 ± 0.32b Roots 52.48 ± 1.57a 16.08 ± 0.13b 17.63 ± 0.41b 27.97 ± 0.46b B.juncea Shoots 19.07 ± 1.34a 19.31 ± 1.36a 20.90 ± 0.27a 17.02 ± 0.08b Roots 16.84 ± 0.61b 16.69 ± 0.44b 17.80 ± 0.62b 20.02 ± 0.33a

Table 1: Macro- (Mg2+, Ca2+, K+) and micro-nutrient (Fe2+, Mn2+, Mo2+, Zn2+ concentrationsin shoots and roots of NiCl2-treated M. crystallinum and B. juncea. Means (n = 6 per treatment ± SE) followed by the same letters are not significantly different at P ≤ 0.05.