© 1997 Heron Publishing—Victoria, Canada
Elevated atmospheric CO2 concentration changes ectomycorrhizal morphotype assemblages in Betula papyrifera
D. L. Godbold (1, 2) and G. M. Berntson (1)
1. Department of Organismic and Evolutionary Biology, Harvard University, Biological Laboratories, 16 Divinity Avenue, Cambridge,
MA 02138, USA / 2. Forstbotanisches Institut, Universität Göttingen, Büsgenweg 2, 37077 Göttingen, Germany / Received April 4, 1996
Summary
Ectomycorrhizae are extremely diverse, with different species of fungi having very different physiologies and morphologies
that, in turn, confer a range of different benefits to the host plant. To test the hypothesis that elevated CO2 leads to changes in the assemblage of ectomycorrhizae associated with trees, we examined the number and frequency of ectomycorrhizal
morphotypes colonizing roots of Betula papyrifera Marsh. saplings grown at an ambient or elevated (700 ppm) atmospheric CO2 concentration for 24 weeks. Elevated CO2 resulted in significant changes in the composition of the ectomycorrhizal assemblage toward morphotypes with a higher incidence
of emanating hyphae and rhizomorphs. We conclude that B. papyrifera saplings will be able to support a more costly mycorrhization in future elevated-CO2 atmospheres.
Keywords:
carbon dioxide, ectomycorrhizae, hyphae, mycorrhizal morphotype, rhizomorph.
