Dipartimento di Chimica e Biotecnologie Agrarie, Università di Pisa, Via del Borghetto 80, 56124 Pisa, Italy.
Environ Pollut. 2009 Oct;157(10):2697-703. doi: 10.1016/j.envpol.2009.04.035. Epub 2009 Jun 3.
Due to relatively high chelant dosages and potential environmental risks it is necessary to explore different approaches in the remediation of metal-contaminated soils. The present study focussed on the removal of metals (As, Cd, Cu, Pb and Zn) from a multiple metal-contaminated soil by growing Brassica carinata plants in succession to spontaneous metallicolous populations of Pinus pinaster, Plantago lanceolata and Silene paradoxa. The results showed that the growth of the metallicolous populations increased the extractable metal levels in the soil, which resulted in a higher accumulation of metals in the above-ground parts of B. carinata. Root exudates of the three metallicolous species were analysed to elucidate their possible role in the enhanced metal availability. The presence of metals stimulated the exudation of organic and phenolic acids as well as flavonoids. It was suggested that root exudates played an important role in solubilising metals in soil and in favouring their uptake by roots.
由于螯合剂用量相对较高且存在潜在的环境风险，因此有必要探索受金属污染土壤修复的不同方法。本研究重点研究了在 Pinus pinaster、Plantago lanceolata 和 Silene paradoxa 等自然形成的嗜金属植物种群后， Brassica carinata 植物对多种金属污染土壤中金属（As、Cd、Cu、Pb 和 Zn）的去除。结果表明，嗜金属植物种群的生长增加了土壤中可提取金属的含量，从而导致 B. carinata 地上部分金属积累增加。分析了三种嗜金属植物的根分泌物，以阐明其在提高金属可利用性方面的可能作用。金属的存在刺激了有机和酚酸以及类黄酮的分泌。研究认为，根分泌物在土壤中溶解金属和促进根部吸收金属方面发挥了重要作用。
