Abstract
Fungal colonisation originating from endophytic thalli in wood of healthy European beech trees (Fagus sylvatica) was studied. Fungi were isolated from wood immediately after felling and after incubation for 8, 16 and 24 weeks under two different drying regimes. Two media were used to isolate fungi: malt extract agar with and without thiabendazol. Thiabendazol was added to inhibit non-basidiomycetes. The two drying regimes had no influence on the species composition of the recovered mycobiota and the frequency of isolation of these species. Mycelia of basidiomycetes except Coniophora puteana emerged only from wood samples inoculated onto malt extract agar containing thiabendazol. Only a few isolates were obtained from freshly cut wood, but a great number of isolates was recovered already after eight weeks of wood incubation. Four taxa accounted for 88 % of the total number of isolates: Hypoxylon fragiforme, Trichoderma spp., and the basidio-mycetes Coniophora puteana and Fomes fomentarius. The latter had not been considered an endophyte before. The isolates of F. fomentarius were made exclusively from the stem and some large diameter branches, which are the locations of its basidiocarps on dying trees. Every isolate of F. fomentarius was genetically different as revealed by tests for somatic compatibility. Advantages of the presumed endophytic strategy of F. fomentarius are discussed. Microscopic investigations showed a great number of hyphae within the cell lumina of vessels and a distinct wood degradation already after eight weeks of wood incubation.
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Baum, S., Sieber, T.N., Schwarze, F.W.M.R. et al. Latent infections of Fomes fomentarius in the xylem of European beech (Fagus sylvatica). Mycol Progress 2, 141–148 (2003). https://doi.org/10.1007/s11557-006-0052-5
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DOI: https://doi.org/10.1007/s11557-006-0052-5