Calcium-(organo)aluminum-proton competition for adsorption to tomato root cell walls: Experimental data and exchange model calculations

W.H. van Riemsdijk, W.G. Keltjens, J.W.M. Postma

Research output: Contribution to journalArticleAcademicpeer-review

14 Citations (Scopus)

Abstract

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 (
Original languageEnglish
Pages (from-to)5247-5254
JournalEnvironmental Science and Technology
Volume39
Issue number14
DOIs
Publication statusPublished - 2005

Keywords

  • aluminum-toxicity
  • conformational transitions
  • calcium pectate
  • organic-acids
  • ion behavior
  • al-binding
  • growth
  • pectin
  • elongation
  • hypothesis

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