Edaphic factors do not govern the ectomycorrhizal specificity of Pisonia grandis (Nyctaginaceae).

Mycorrhiza
Jeremy A Hayward, Thomas R Horton

Abstract

Pisonia grandis (Nyctaginaceae), a widespread tree of Pacific coral atolls and islands, displays one of the more restrictive ranges of ectomycorrhizal (ECM) fungus associates among autotrophic plants. Only five ECM fungi are currently known associates; our study adds one. In many habitats, P. grandis is restricted to large seabird colonies where nitrogen and phosphorus inputs in the form of guano are substantial. It has been suggested that the ECM specificity displayed by P. grandis is the result of the unusual nutrient-rich habitat in which P. grandis grows. On Rota, Commonwealth of the Northern Mariana Islands, P. grandis grows in habitats heavily influenced by guano additions and also in upland forests where seabirds do not roost or nest. To test the hypothesis that the ECM specificity displayed by P. grandis is the result of nutrient-related or toxicity-related factors associated with guano inputs, we sampled P. grandis growing in both guano-rich and guano-poor habitats on Rota, Commonwealth of the Northern Mariana Islands. We identified ECM symbionts of P. grandis from both habitats as well as two symbionts of Intsia bijuga (Fabaceae) from nutrient-rich habitats. We identified three ECM symbionts of P. grandis from Rota; a...Continue Reading

References

Feb 1, 1979·Proceedings of the National Academy of Sciences of the United States of America·B Vogelstein, D Gillespie
May 21, 2005·BMC Microbiology·Kendall J Martin, Paul T Rygiewicz
Jul 30, 2010·PloS One·Sara Branco, Richard H Ree
Apr 1, 2002·Integrative and Comparative Biology·Thomas D BrunsD Lee Taylor

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