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Metal binding properties of high molecular weight soluble exudates from maize (Zea mays L.) roots

A high molecular weight (MW > 1000) soluble root exudate fraction (HS) was isolated from hydroponic axenic maize cultures in order to investigate its metal-binding properties. Measurements of the maximum binding ability (MBA) and the overall stability constants (log K) for cadmium-, copper-, lead- and zinc-HS associations were obtained from dialysis and ion-selective electrode titrations. All results showed the occurrence of organometallic bindings. Data fitted to linear Langmuir isotherms. The MBA, measured by dialysis titration, varied from 160 to 206 mEq/100 g HS according to the nature of the metal. log K values, following the series Pb > Cu > Cd 5 Zn, varied from 3.15 to 3.65. Due to these metal-binding properties, soluble root products could play a role in the transfer of metal into the rhizosphere.

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1. Department of Plant Science, Ecole Nationale Supérieure d' Agronomic et des Industries Alimentaires, 2, Avenue de la Foret de Haye, F-54500, Vandoeuvre, France

   M. Mench, J.L. Morel & A. Guckert

1. M. Mench
2. J.L. Morel
3. A. Guckert

Mench, M., Morel, J. & Guckert, A. Metal binding properties of high molecular weight soluble exudates from maize (Zea mays L.) roots. Biol Fert Soils 3, 165–169 (1987). https://doi.org/10.1007/BF00255778

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• Received: 02 April 1986

• Issue Date: September 1987

• DOI: https://doi.org/10.1007/BF00255778

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