Wiche Oliver, Tischler Dirk, Fauser Carla, Lodemann Jana, Heilmeier Hermann
a Institute for Biosciences, Biology/Ecology Group, TU Bergakademie Freiberg , Freiberg , Germany.
b Interdisciplinary Environmental Centre, TU Bergakademie Freiberg , Freiberg , Germany.
Int J Phytoremediation. 2017 Aug 3;19(8):746-754. doi: 10.1080/15226514.2017.1284752.
Effects of citric acid and desferrioxamine B (DFO-B) on the availability of Ge and selected rare earth elements (REEs) (La, Nd, Gd, Er) to Phalaris arundinacea were investigated. A soil dissolution experiment was conducted to elucidate the effect of citric acid and DFO-B at different concentrations (1 and 10 mmol L citric acid) on the release of Ge and REEs from soil. In a greenhouse, plants of P. arundinacea were cultivated on soil and on sand cultures to investigate the effects of citric acid and DFO-B on the uptake of Ge and REEs by the plants. Addition of 10 mmol L citric acid significantly enhanced desorption of Ge and REEs from soil and uptake into soil-grown plants. Applying DFO-B enhanced the dissolution and the uptake of REEs, while no effect on Ge was observed. In sand cultures, the presence of citric acid and DFO-B significantly decreased the uptake of Ge and REEs, indicating a discrimination of the formed complexes during uptake. This study clearly indicates that citric acid and the microbial siderophore DFO-B may enhance phytoextraction of Ge and REEs due to the formation of soluble complexes that increase the migration of elements in the rhizosphere.
研究了柠檬酸和去铁胺B（DFO-B）对芦苇对锗及选定稀土元素（REEs，即镧、钕、钆、铒）有效性的影响。进行了一项土壤溶解实验，以阐明不同浓度（1和10 mmol/L柠檬酸）的柠檬酸和DFO-B对土壤中锗和稀土元素释放的影响。在温室中，将芦苇种植在土壤和砂培中，以研究柠檬酸和DFO-B对植物吸收锗和稀土元素的影响。添加10 mmol/L柠檬酸显著增强了锗和稀土元素从土壤中的解吸以及对土壤种植植物的吸收。施用DFO-B增强了稀土元素的溶解和吸收，而未观察到对锗有影响。在砂培中，柠檬酸和DFO-B的存在显著降低了锗和稀土元素的吸收，表明在吸收过程中对形成的络合物有选择性。这项研究清楚地表明，柠檬酸和微生物铁载体DFO-B可能会增强锗和稀土元素的植物提取，这是由于形成了可溶性络合物，增加了根际中元素的迁移。
