Influence of root exudates and root activity on the availability of nutrients and other metals in the rhizosphere
The goal of this study was to investigate the influence of organic root exudates and root activity on nutrient and metal species in the rhizosphere of Lupinus albus and species and ecotypes of the plant genus Thlaspi. Using a modified version of the rhizobox system developed by Dieffenbach et al. (1997), we found that phosphate concentrations were highly variable in the vicinity of roots during the exudation of organic acids by Lupinus albus. In addition, large amounts of metal cations were mobilized in the rhizosphere of Lupinus albus during a burst of exudation. Metal concentrations were closely correlated with citrate. The Zn and Cd hyperaccumulator ecotype Gange of Thtaspi caerulescens investigated in this study strongly bound Zn and Cd to the root surfaces. We hypothesize that strong expression of high-affinity metal transporters by this plant is a key factor involved in Zn and Cd hyperaccumulation by this plant.
citrate Lupinus albus metal mobilisation rhizobox rhizosphere Thlaspi caerulescens
Jacynthe Dessureault-Rompre Bernd Nowack Rainer Schulin Marie-Louise Tercier-Waeber Catherine Keller Jorg Luster
Institut of Terrestrial Ecosytems (ITEs), ETH Zurich, Universitatstrasse 16 CH-8092 Switzerland CABE, Dep. of Inorganic and Analytical Chemistry, Sciences II, University of Geneva, Switzerland CEREGE, Universite Aix-Marseille III, France Swiss Federal Institute for Forest, Snow, and Landscape Research (WSL), Switzerland
国际会议
第九届痕量元素生物地球化学国际会议(9th International Conference on the Biogeochemistry of Trace Elements)
北京
英文
690-691
2007-07-15（万方平台首次上网日期，不代表论文的发表时间）