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Organic acids produced by mycorrhizal Pinus sylvestris exposed to elevated aluminium and heavy metals concentrations
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
2000 (English)In: New Phytologist, ISSN 0028-646X, E-ISSN 1469-8137, Vol. 146, no 3, 557-567 p.Article in journal (Refereed) Published
Abstract [en]

A cultivation method was developed to enable exposure of ectomycorrhizal plants with intact extramatrical mycelium to solutions containing different concentrations of aluminium or heavy metals. Pinus sylvestris seedlings colonized by Suillus variegatus (two isolates), Rhizopogon roseolus or Paxillus involutus (two isolates) were used. Seedlings were transferred to Petri dishes containing glass beads and exposed to elevated concentrations of Al, Cd, Cu, or Ni in two ways: immediately following transfer; and after allowing mycorrhizal seedlings to develop an extraradical mycelium that colonized the interface between the upper surface of the beads and the metal-containing solution. Production of organic acids in mycorrhizal and non-mycorrhizal systems was measured by withdrawing samples from the solution and analyzing by HPLC. In most experiments, levels of oxalic acid were significantly higher in mycorrhizal treatments than in non-mycorrhizal controls. The measured levels of organic acids were variable, but the results obtained suggest that production of oxalic acid is stimulated by exposure to elevated Al in mycorrhizal seedlings colonized by S. variegatus and R. roseolus. Elevated Al concentrations also increased oxalic acid production by non-mycorrhizal seedlings significantly in two of four Al experiments performed, but the measured concentrations were significantly lower than in corresponding mycorrhizal treatments in both cases. Malonic acid was found in the culture solution of non-mycorrhizal had P. involutus-colonized seedlings, but only trace amounts were found in S. variegatus or R. roseolus-infected seedlings. Citric, shikimic, lactic, acetic, propionic, fumaric, formic, iso-butyric and butyric acid were found in variable concentrations. Production of oxalic acid by seedlings ColoniZed by S. variegatus BL or P. involutus was not stimulated by exposure to 0.44 μM Cd or 17 μM Ni. Exposure to 0.157 mM CU in two separate experiments using P. involutus 87.017 and two strains of S. variegatus (BL and 159) appeared to stimulate production of oxalic acid irrespective of mycorrhizal status or species.

Place, publisher, year, edition, pages
2000. Vol. 146, no 3, 557-567 p.
Keyword [en]
Aluminium, Copper, Ectomycorrhiza, Extramatrical mycelium, Heavy metals, Oxalic acid, Pinus sylvestris (Scots pine), Toxicity
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:miun:diva-2658DOI: 10.1046/j.1469-8137.2000.00653.xISI: 000088299900020Scopus ID: 2-s2.0-0033922523Local ID: 2039OAI: oai:DiVA.org:miun-2658DiVA: diva2:27690
Available from: 2008-09-30 Created: 2008-09-30 Last updated: 2016-10-10Bibliographically approved

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Van Hees, P.A.W.Lundström, Ulla
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CiteExportLink to record
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Citation style
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