Biology and Fertility of Soils

, Volume 3, Issue 3, pp 165–169

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

  • M. Mench
  • J.L. Morel
  • A. Guckert
Article

DOI: 10.1007/BF00255778

Cite this article as:
Mench, M., Morel, J. & Guckert, A. Biol Fert Soils (1987) 3: 165. doi:10.1007/BF00255778
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Summary

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.

Key words

Root exudates Copper Cadmium Lead Zinc Dialysis ISE 

Copyright information

© Springer-Verlag 1987

Authors and Affiliations

  • M. Mench
    • 1
  • J.L. Morel
    • 1
  • A. Guckert
    • 1
  1. 1.Department of Plant ScienceEcole Nationale Supérieure d' Agronomic et des Industries AlimentairesVandoeuvreFrance

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