Calcium-(Organo)aluminum-proton Competition for Adsorption to Tomato Root Cell Walls:  Experimental Data and Exchange Model Calculations

Aluminum interacts with negatively charged surfaces in plant roots, causing inhibition of growth and nutrient uptake in plants growing on acid soils. Pectins in the root cell wall form the major cation adsorption surface, with Ca2+ as the main adsorbing cation. Adsorption of Al3+ and Ca2+ to isolate...

Full description

Saved in:
Bibliographic Details
Published in:Environmental science & technology 2005-07, Vol.39 (14), p.5247-5254
Main Authors: Postma, Jacqueline W. M, Keltjens, Willem G, van Riemsdijk, Willem H
Format: Article
Language:English
Subjects:
Absorption. Translocation of ions and substances. Permeability
Adsorption
Agronomy. Soil science and plant productions
al-binding
Aluminum
Aluminum - chemistry
Aluminum - toxicity
Binding Sites
Binding, Competitive
Biologi
Biological and medical sciences
Biological Sciences
Botany
Calcium
Calcium - chemistry
calcium pectate
Cell Wall - chemistry
conformational transitions
Deficiencies. Phytotoxicity of elements. Salinity
Ecology
Economic plant physiology
Ekologi
elongation
Fundamental and applied biological sciences. Psychology
General agronomy. Plant production
growth
Hydrogen-Ion Concentration
hypothesis
ion behavior
Lycopersicon esculentum - chemistry
Models, Theoretical
Natural Sciences
Naturvetenskap
Nutrition. Photosynthesis. Respiration. Metabolism
organic-acids
pectin
Pectins - chemistry
Plant physiology and development
Plant Roots
Protons
Soil contamination
Soil-plant relationships. Soil fertility. Fertilization. Amendments
Tomatoes
Water and solutes. Absorption, translocation and permeability
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Aluminum interacts with negatively charged surfaces in plant roots, causing inhibition of growth and nutrient uptake in plants growing on acid soils. Pectins in the root cell wall form the major cation adsorption surface, with Ca2+ as the main adsorbing cation. Adsorption of Al3+ and Ca2+ to isolated cell wall material of tomato (Lycopersicon esculentum L.) roots was examined at pH 3.00−4.25 and in the presence of the aluminum chelators citrate and malate. Al3+ displaced Ca2+ from its pectic binding sites in the cell wall to a large extent but apparently also bound to non-Ca binding groups, displacing protons. Aluminum adsorption depended on the pH of the solution, with little Al adsorbing to the cell wall material at very low pH (
ISSN:0013-936X
1520-5851
1520-5851
DOI:10.1021/es048138v