Int J Phytoremediation. 2014;16(7-12):1257-67. doi: 10.1080/15226514.2013.828010.
In this study, a hydroponics experiment was conducted to investigate the characteristics of Cd tolerance and accumulation of Elsholtzia argyi natively growing on the soil with high levels of heavy metals in a Zn/Pb mining site. Seedlings of E. argyi grown for 4 weeks and then were treated with 0(CK), 5,10,15, 20, 25, 30, 40, 50,100 umM Cd for 21 days. Each treatment had three replications. No visual toxic symptoms on shoots of E. argyi were observed at Cd level < or = 50 muM. The results indicated that the dry biomass of each tissue and the whole plants of the treatments with < or =40 umM cadmium were similar to that of the control, implying that E. argyi was a cadmium tolerant plant. The results also showed that the shoot Cd concentration significantly (P < 0.05) increased with the increase in the Cd level in nutrient solution. The shoot Cd concentration of the treatment with 40 umM Cd was as high as 237.9 mg kg(-1), which was higher than 100 mg kg(-1), normally used as the threshold concentration for identifying the Cd hyperaccumulating plant. It could be concluded that E. argyi was a Cd tolerant and accumulating plant species.
在这项研究中，进行了一项水培实验，以研究在 Zn/Pb 矿区土壤中重金属含量较高的条件下，艾蒿对 Cd 的耐受性和积累特性。将生长了 4 周的艾蒿幼苗用 0（对照）、5、10、15、20、25、30、40、50、100 umM Cd 处理 21 天。每种处理有三个重复。在 Cd 水平<或=50 μM 时，艾蒿地上部分没有观察到明显的毒性症状。结果表明，Cd 浓度<或=40 μM 处理的各组织和整株植物的干生物量与对照相似，表明艾蒿是一种 Cd 耐受植物。结果还表明，随着营养液中 Cd 水平的增加，地上部 Cd 浓度显著（P<0.05）增加。40 μM Cd 处理的地上部 Cd 浓度高达 237.9 mg kg(-1)，高于 100 mg kg(-1)，通常用作鉴定 Cd 超积累植物的阈值浓度。可以得出结论，艾蒿是一种 Cd 耐受和积累植物。
