. 2016 Nov 30;7:1819. doi: 10.3389/fpls.2016.01819

Table 3.

Effects of Mg²⁺ on concentrations of Pb²⁺ and Mg²⁺ in shoots and roots of T. grandis seedlings grown under Pb²⁺ toxicity.

Treatment	Pb²⁺ content (mg kg^-1) Root	Shoot	Mg²⁺ content (mg g^-1) Root	Shoot
T1	n.d.	n.d.	0.39 ± 0.03^b	0.74 ± 0.03^b
T2	n.d.	n.d.	0.73 ± 0.08^a	3.27 ± 0.05^a
T3	689.1 ± 30.5^b	231.4 ± 12.3^a	0.44 ± 0.05^b	0.79 ± 0.02^b
T4	876.1 ± 20.2^a	156.2 ± 3.6^b	0.76 ± 0.01^a	3.37 ± 0.2^a

Data points and error bars represent mean ± standard deviation of three replicates. Different letters indicate significant differences (P < 0.05); n = 3. The same letter in the same column denotes no significant difference among treatments, n.d. = not determined. Treatments: T1, control; T2, control + 1040 mg kg^-1 Mg²⁺; T3, 1400 mg kg^-1 Pb²⁺; T4, 1400 mg kg^-1 Pb²⁺ + 1040 mg kg^-1 Mg²⁺.