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Aluminum (Al) in acidic soils is toxic to plants, affecting growth, water uptake and nutrient assimilation. Aluminum resistance in some plant species and genotypes has been ascribed to organic acid exudation from roots and arbuscular mycorrhizal (AM) fungal symbiosis. We investigated variation among several AM species in altering Al resistance of Liriodendron tulipifera L. and evaluated AM influence on organic acid production as a potential Al resistance mechanism. Growth, nutritional responses and rhizosphere organic acid profiles were assessed for seedlings in association with Acaulospora morrowiae Spain &amp; Schenck, Glomus claroideum Schenck &amp; Smith, G. clarum Nicol. &amp; Schenck or Paraglomus brasilianum (Spain &amp; Miranda) Morton &amp; Redecker and non-mycorrhizal seedlings exposed to 0, 50 or 200 microM Al. Plants colonized by G. clarum had the greatest biomass, least Al and most phosphorus (P) in leaf tissues and exuded malate and citrate into the rhizosphere at rates that complexed 99% of delivered Al in all treatments. Other AM fungi did not confer significant Al resistance on L. tulipifera and did not maintain citrate and malate exudation in response to Al exposure. This study illustrates functional diversity among AM fungal species in conferred Al resistance to plants and highlights the potential importance of fungal diversity in ecosystem responses to environmental stresses.

Variations in organic acid exudation and aluminum resistance among arbuscular mycorrhizal species colonizing Liriodendron tulipifera