Journal Article

Aluminium and phosphate uptake by Phragmites australis: the role of Fe, Mn and Al root plaques

Wheeler, B D, Baker, A.J.M., Batty, L C

2002

Overview

Aluminium, a potentially phytotoxic metal, is an important constituent of many mine water discharges but has largely been neglected in the literature. The behaviour of this element in the rhizosphere of the wetland plant Phragmites australis was investigated in the laboratory in the presence and absence of Mn and Fe root plaques. Electron microscopy and chemical extraction techniques were utilized to determine the physico-chemical properties of the plaques and any association of Al. Both Mn and Fe plaques occurred as amorphous coatings on root surfaces with uneven distributions. Al was not adsorbed onto the surface of either plaque type but formed a separate phosphate deposit closely resembling the Fe and Mn plaques. Phosphorus was also found to be adsorbed to the surface of the Fe plaques (but not the Mn plaques). Both mechanisms were found to immobilize P at the root surface but this did not significantly reduce the concentration of P in aerial plant tissues that was sufficient to ensure adequate growth.

• Subject: adsorption / aluminum / callus / cambium / cell differentiation / cell division / Cell Wall ultrastructure / coatings / developmental stages / drug effects / iron / manganese / mechanical damage / metabolism / Microscopy, Electron, Scanning / nutrient content / nutrient uptake / pharmacology / phloem / phosphates / phosphorus / Phragmites australis / phytotoxicity / Plant Bark cytology growth & development ultrastructure / plant development / Plant Roots / Plant Shoots / Plant Stems cytology growth & development ultrastructure / Poaceae / rhizosphere / roots / spatial distribution / Spectrum Analysis / Tilia / Tiliaceae cytology growth & development ultrastructure / Time Factors / Trees cytology growth & development ultrastructure / ultrastructure / Vacuoles ultrastructure / wound periderm / xylem