Figure 4.
Changes in the P, K, Ca, Mg, Fe, Cu, and Zn content of Polygonatum sibiricum under Cd stress. A, B, C, D, E, F, and G represent P, K, Ca, Mg, Fe, Cu, and Zn, respectively. Each value represents the mean ± standard deviation of three independent experiments. Different letters above the bars represent significant differences (p < 0.05).