Mechanisms of Copper Stress Response in Plants: Implications for the Medicinal Plant <i>Platycodon grandiflorus</i>.

In terms of physiology and biochemistry, the superoxide dismutase activity of Platycodon grandiflorus seedlings under cadmium and mercury treatment showed a trend of initially increasing and then decreasing as heavy metal concentrations rose, whilst peroxidase activity exhibited relatively complex fluctuations; Malondialdehyde levels initially decreased and then increased under cadmium stress, whereas they continued to rise under mercury stress; this indicates that the extent of heavy metal-induced oxidative damage is closely related to the intensity of the stress [ 33 ].

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