Department of Geosciences, Technical University of Freiberg, Gustave_Zeuner Str. 12, 09599 Freiberg, Germany.
Chemosphere. 2012 Jul;88(6):683-7. doi: 10.1016/j.chemosphere.2012.03.075. Epub 2012 May 8.
Hyperaccumulators are grown in contaminated soil and water in order that contaminants are taken up and accumulated. Transport of metals from soil to plant is initially dependent on the solubility and mobility of metals in soil solution which is controlled by soil and metal properties and plant physiology. Complexation with organic and inorganic ligands may increase mobility and availability of metals for plants. In this work the influence of desferrioxamine-B (DFO-B), which naturally is produced in the rhizosphere, and zeolite on Cd accumulation in root and shoot of Thlaspi caerulescens (Cd hyperaccumulator) was investigated. Plants were grown in pots with clean quartz sand, amended with 1% zeolite; treatment solutions included 0, 10, and 100 μM Cd and 70 μM DFO-B. Addition of zeolite to the quartz sand significantly reduced Cd concentration in plant tissues and translocation from root to shoot. On contrary, DFO-B considerably enhanced Cd sorption by roots and translocation to aerial part of plants. Treating the plants with zeolite and DFO-B together at 10 μM Cd resulted in reduction of the bioaccumulation factor but enhancement of Cd translocation from root to shoot at the rate of 13%. In contrast, at 100 μM Cd in the solution both bioaccumulation and translocation factors decreased. Total metal accumulation as a key factor for evaluating the efficiency of phytoremediation was highly influenced by treatments. Presence of zeolite in pots significantly decreased total Cd accumulation by plants, whereas, DFO-B clearly enhanced it.
超积累植物在受污染的土壤和水中生长，以便污染物被吸收和积累。金属从土壤到植物的运输最初取决于金属在土壤溶液中的溶解度和迁移率，而土壤溶液中的溶解度和迁移率又受土壤和金属性质以及植物生理学的控制。与有机和无机配体的络合作用可能会增加金属对植物的迁移性和可用性。在这项工作中，研究了天然存在于根际的去铁胺 B（DFO-B）和沸石对天蓝遏蓝菜（Cd 超积累植物）根和地上部分 Cd 积累的影响。植物在盛有清洁石英砂的盆中生长，并用 1%沸石进行了改良；处理溶液包括 0、10 和 100 μM Cd 和 70 μM DFO-B。向石英砂中添加沸石可显著降低植物组织中的 Cd 浓度，并减少 Cd 从根部向地上部分的转移。相反，DFO-B 可大大增强 Cd 对根部的吸附和向植物地上部分的转移。用沸石和 DFO-B 同时处理 10 μM Cd 可降低生物积累因子，但以 13%的速率增强 Cd 从根部向地上部分的转移。相比之下，在溶液中 Cd 浓度为 100 μM 时，生物积累和迁移因子均降低。作为评估植物修复效率的关键因素，总金属积累受到处理的高度影响。盆中沸石的存在可显著降低植物对总 Cd 的积累，而 DFO-B 则明显增强了这一作用。
