Changes of Ni Biogeochemistry in the Rhizosphere of the Hyperaccumulator Thlaspi geosingense

Root-induced changes of nickel biogeochemistry were examined in the rhizosphere of the hyperaccumulator, Thlaspi geosingense. Labile Ni in the rhizosphere was depleted due to excessive uptake by the plant while soluble Ni increased. Findings suggest that root activities such as exudation of organic...

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Bibliographic Details
Published in:Plant and soil 2005-04, Vol.271 (1), p.205-205
Main Authors: Puschenreiter, Markus, Schnepl, Andrea, Millan, Ines Molina, Fitz, Walter J, Horak, Othmar, Klepp, Jurgen, Schreff, Thomas
Format: Article
Language:English
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Summary:Root-induced changes of nickel biogeochemistry were examined in the rhizosphere of the hyperaccumulator, Thlaspi geosingense. Labile Ni in the rhizosphere was depleted due to excessive uptake by the plant while soluble Ni increased. Findings suggest that root activities such as exudation of organic acids trigger replenishment of soluble Ni from sources other than the adsorbed fraction through interactions with the soil solid phase. A hydroponic trial demonstrated the importance of the effect of chemical speciation on the uptake of metals by hyperaccumulator plants.
ISSN:0032-079X