2002: 419: 389-392

Epiparasitic plants specialized on arbuscular mycorrhizal fungi

Martin I. Bidartondo1, Dirk Redecker2, Isabelle Hijrl2, Andres Wiemken2, Thomas D. Bruns1, Laura Dominguez3, Alicia Sersic3, Jonathan R. Leake4 and David J. Read4
1 Department of Plant & Microbial Biology, University of California, Berkeley, California 94720-3102, USA
2 Institute of Botany, University of Basel, Hebelstrasse 1, 4056 Basel, Switzerland
3 Instituto Multidisciplinario de Biolog?a Vegetal, C.C. 495, C?rdoba 5000, Argentina
4 Department of Animal & Plant Sciences, University of Sheffield, Sheffield S10 2TN, UK

Over 400 non-photosynthetic species from 10 families of vascular plants obtain their carbon from fungi and are thus defined as myco-heterotrophs. Many of these plants are epiparasitic on green plants from which they obtain carbon by 'cheating' shared mycorrhizal fungi. Epiparasitic plants examined to date depend on ectomycorrhizal fungi for carbon transfer and exhibit exceptional specificity for these fungi, but for most myco-heterotrophs neither the identity of the fungi nor the sources of their carbon are known. Because many myco-heterotrophs grow in forests dominated by plants associated with arbuscular mycorrhizal fungi (AMF; phylum Glomeromycota), we proposed that epiparasitism would occur also between plants linked by AMF. On a global scale AMF form the most widespread mycorrhizae, thus the ability of plants to cheat this symbiosis would be highly significant. We analysed mycorrhizae from three populations of Arachnitis uniflora (Corsiaceae, Monocotyledonae), five Voyria species and one Voyriella species (Gentianaceae, Dicotyledonae), and neighbouring green plants. Here we show that non-photosynthetic plants associate with AMF and can display the characteristic specificity of epiparasites. This suggests that AMF mediate significant inter-plant carbon transfer in nature.

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