[Objective] The present experiment was conducted to study the phytoremediation properties of Morus alba L and Zenia insignis Chun seedlings, facilitated by EDTA treatments. [Method] A nutrient culture experiment was set up by culturing the Morus a/ha L. and Zenia insignis Chun seedlings in Hoagland solution (4 L/pot) containing 0.55 mmol/L EDTA.The Pb2+ was supplemented in graded concentrations (0, 2.5, 5.0, 10.0, 25.0, 50.0, 100.0, 150.0, 200.0, and 250.0 rog/L) in different pots, the control was maintained without adding EDTA. [Result] The results showed that the absorption and accumulation of Pb2＋ in both plants increased gradually with increasing of the Pb2＋ concentration in the solution. Under the same Pb2+concentration, the absorption of Pb2＋ in plants with EDTA treatment was significantly higher than the control. The concentration of Pb2+ was found more in roots than that in stem and leaves of both plants. However, EDTA treatment was found to accelerate the transport of Pb2+ from root to stem and leaves. With increasing the concentration of Pb2+ in solution, it was accumulated more in roots compared to stem and leaves. [Conclusion] Both plants showed strong Pb tolerance, and EDTA was found to accelerate the Pb2+ absorption. These plants may be used in phytoremediation of the Pb contaminated soils.%[目的]研究不同重金属Pb2+浓度下螯合剂EDTA处理对桑树和任豆幼苗修复土壤中重金属Ph2+的效果及Pb2+在植物茎叶及根部积累,以期为重金属污染土壤生态修复及植物资源的合理利用提供理论依据.[方法]用盆栽模拟法,以4 L/盆Hoagland营养液作为培养液,培养液中的Pb2+浓度分别为0、2.5、5.0、10.0、25.0、50.0、100.0、150.0、200.0、250.0 mg/L,EDTA的浓度均为0.55 mmol/L,以不添加EDTA作对照.分别测定桑苗和任豆幼苗茎叶和根部的Ph2+浓度.[结果]随着水培液中Pb2+浓度的增加,桑树和任豆幼苗对Pb2+的吸收和积累量也逐渐增大;在相同的重金属Ph2+胁迫背景下,加入EDTA的桑树和任豆幼苗对Pb2+的吸收量比不添加EDTA的对照组明显增高;桑树和任豆幼苗体内Pb2+浓度通常为根部>茎叶,而添加EDTA能加速重金属Pb2+向茎叶的转运.随着培养液中Pb2+浓度的增加和时间的延长,Pb2+在植物根部的积累逐渐增加,而向茎叶的转运则相对减少.[结论]桑树和任豆幼苗具有较强的重金属Pb耐性,而EDTA能促进桑树和任豆幼苗对重金属pb2+的吸收,因此,桑树和任豆可作为修复植物应用于重金属污染地区.
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