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Annals of Botany 89: 443-449, 2002
© 2002 Annals of Botany Company

Aluminium and Phosphate Uptake by Phragmites australis: the Role of Fe, Mn and Al Root Plaques

LESLEY C. BATTY*,1, ALAN J. M. BAKER2 and BRYAN D. WHEELER3

1Department of Civil Engineering, University of Newcastle, Newcastle Upon Tyne NE1 7RU, UK, 2School of Botany, The University of Melbourne, Parkville, VIC 3010, Australia and 3Department of Animal and Plant Sciences, University of Sheffield, Sheffield S10 2TN, UK

* For correspondence. Fax +44 191 2226613, e-mail L.C.Batty{at}ncl.ac.uk

Received: 11 September 2001; Returned for revision: 18 November 2001; Accepted: 6 January 2002.

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.

Key words: Aluminium, common reed, iron, manganese, metal immobilization, phosphate, Phragmites australis, wetlands.


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