Abstract
Among the mycorrhizal types of spruce, Tylospora-type mycorrhizae are the most constant and abundant. Two species of the genus Tylospora occur in Europe, Tylospora fibrillosa and Tylospora asterophora. Mycorrhizae of T. asterophora are described in detail for the first time. Sequences of the internal transcribed spacer (ITS) of the ribosomal genes were obtained from T. fibrillosa and T. asterophora mycorrhizae, sporocarps, and cultured mycelium. Discrimination and identification of the two species by ITS polymerase chain reaction - restriction fragment length polymorphism (PCR-RFLP) are discussed in the light of inter- and intra-specific variability. Species-specific PCR primers were designed to distinguish both species. Molecular screening of Tylospora-type mycorrhizae from field material led to unambiguous results, whereas morphological identification is likely to fail because of great similarity even at the microscopic level.Key words: Tylospora asterophora, Tylospora fibrillosa, ectomycorrhizae, taxon specific primers (TSOPs), ITS sequences.
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