Abstract
Ericaceae associate with a wide spectrum of root mycobionts, but the most common are ascomycetous ericoid mycorrhizal fungi and dark septate endophytes (DSE), followed by basidiomycetous fungi and glomeracean arbuscular mycorrhizal fungi. We investigated distribution and morphological diversity of ericoid mycorrhizae (ErM), DSE associations, ectomycorrhizae (EcM) and arbuscular mycorrhizae (AM) in hair roots of six European native Rhododendron species and found that i) while EcM and AM were absent, ErM and DSE associations were simultaneously present in all screened plants; ii) their levels were negatively correlated, suggesting Ericaceae preference for certain root-fungus association in certain habitats; iii) the highest ErM colonization occurred at sites in southern and central Europe, while the highest DSE colonization was found in a subarctic site in northern Finland and in a subalpine site in the Carpathians, suggesting a latitudinal/altitudinal shift in Ericaceae root-fungus associations; iv) some mycelia could simultaneously form structures corresponding to ErM and DSE association, which occasionally resulted in a unique ectendomycorrhizal colonization comprising an intercellular parenchymatous net and intracellular hyphal coils. These results indicate frequent interactions between ErM fungi and DSE in roots of European rhododendrons and a morphological continuum between ErM and DSE associations. The new ectendomycorrhizal type deserves further investigation.
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Acknowledgement
This study is a part of the research project AV0Z60050516 of the Institute of Botany ASCR and SVV 261209/2010 of Charles University in Prague. MV wishes to thank M. Vosátka for general supervision, and D. Vodnik, S. Lukančič, M.-M. Kytoviita, T. Kojola, R. Partanen, J.A. Mejías and M. Fendrych for help with collecting the root samples. Inspiring comments of three anonymous reviewers are also acknowledged.
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Vohník, M., Albrechtová, J. The Co-occurrence and Morphological Continuum Between Ericoid Mycorrhiza and Dark Septate Endophytes in Roots of Six European Rhododendron Species. Folia Geobot 46, 373–386 (2011). https://doi.org/10.1007/s12224-011-9098-5
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DOI: https://doi.org/10.1007/s12224-011-9098-5