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. 2020 Mar 24;9(3):404. doi: 10.3390/plants9030404

Figure 4.

Figure 4

Effect of different levels of Cu-contaminated soil mixed with natural soil on superoxidase dismutase (SOD) (a), peroxidase (POD) (b), catalase (CAT) (c) and ascorbate peroxidase (APX) (d) in the leaves of C. capsularis. Values in the figures are just one harvest. Bars sharing different lowercase letters denote significant statistical differences among the treatments at p < 0.05 according to least significant difference (LSD) test. Ck (soil without addition of Cu-contaminated soil), T1 (Cu-contaminated soil is mixed with natural soil by 1:4), T2 (Cu-contaminated soil is mixed with natural soil by 1:2), T3 (Cu-contaminated soil is mixed with natural soil by 1:1) and T4 (Cu-contaminated soil is mixed with natural soil by 1:0). 2.5. Cu Uptake and Accumulation by Roots and Shoots.