Isolated cell walls exhibit cation binding properties distinct from those of plant roots
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The principal contributor to the cation binding properties of roots is currently considered to be the cell wall or, alternatively, the plasma membrane. The aim of this study was to highlight their respective contributions in the binding properties.
Cell walls of a dicotyledon (Solanum lycopersicum L.) and monocotyledon (Triticum aestivum L.) were isolated from roots and their binding properties were compared to those of their respective roots. Cell wall and root binding capacities were evaluated by potentiometric titrations and cation exchange capacity measurements, while their biochemical composition was analyzed by 13C-NMR spectroscopy.
The lower binding capacity of isolated cell walls compared to roots revealed that cell plasma membranes had a higher binding site density than cell walls. The significant decrease in some NMR signals, i.e. carbonyl C, N alkyl/methoxyl C and alkyl C regions, suggested that carboxyl, amine and phosphate binding sites, borne by proteins and phospholipid plasma membranes, contribute to the binding capacity.
Cell walls and plasma membranes were found to be jointly involved in root binding properties and their respective contributions seemed vary between plants.
KeywordsApoplast Cell plasma membrane Heavy metal Binding capacity Potentiometric titration 13C-NMR spectroscopy
The authors are grateful to French Environment and Energy Management Agency (ADEME) and the French Centre of Agricultural Research for Development (CIRAD) for funding the PhD scholarship of Stéphanie Guigues and INSU (CNRS) for funding the study via the EC2CO-CYTRIX call. The authors thank Patrick Cazevieille and Claire Chevassus-Rosset (CIRAD) for their technical support during the plant growth phase, Hélène Miche (CEREGE) for providing access to ICP-AES and Jean-Claude Davidian (Montpellier SupAgro) for his advice on root cell wall isolation.
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