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Measurement of Cation Exchange Capacity (CEC) of Plant Cell Walls by X-Ray Microanalysis (EDX) in the Transmission Electron Microscope

Published online by Cambridge University Press:  16 July 2007

Eberhard Fritz
Eberhard Fritz
Affiliation:
Institute of Forest Botany, University of Goettingen, Buesgenweg 2, 37077 Goettingen, Germany
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Abstract

Cation exchange capacity (CEC) characterizes the number of fixed negative charges of plant cell walls and is an important parameter in studies dealing with the uptake of ions into plant tissues, especially in roots. Conventional methods of CEC determination use bulk tissue, the results are the mean of many cells, and differences in the CEC of different tissue types are masked. Energy-dispersive microanalysis (EDX) in the transmission electron microscope allows CEC determinations on much finer scales. Shoot and fine root tissue of Picea abies was acid washed to remove exchangeable cations. Tissue blocks or semithin tissue sections were loaded with 0.2 mM CaCl2, AlCl3, or Pb(NO3)2 at pH 4.0. The amount of Ca, Al, or Pb adsorbed to the exchange sites of cell walls was determined by EDX. The CEC of cell walls of different tissue types was highly different, ranging in shoot tissues from 0 to 856 mM Ca and 5.8 to 1463 mM Al (block loading) or 4.3 to 1116 mM Ca and 0 to 2830 mM Al (section loading). In root tissue, Pb adsorption to semithin sections yielded CEC values between 29.1 and 954 mM Pb. In most P. abies shoot tissues, the binding capacity was clearly higher for Al than for Ca.

Keywords

adsorptioncation exchange capacityCECcell wallEDXTEMtransmission electron microscopeX-ray microanalysis
Type
BIOLOGICAL APPLICATIONS
Information
Microscopy and Microanalysis , Volume 13 , Issue 4 , August 2007 , pp. 233 - 244
Copyright
© 2007 Microscopy Society of America

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