Genetic Diversity Of Three Ectomycorrhizal Fungi In Donglingshan Of Beijing

The genetic variation and spatial distribution of the population of ectomycorrhizal fungi Chroogomphus rutilus, Suillus granulatus, and Tricholoma terreum were studied using RAPD and RAMS in coniferous forest in Donglingshan of Beijing. Results showed that the 33 sporophores of T. terreum collected from Larix principis-rupprechtii stand belonged to distinct genotypes based on the analysis of RAPD markers. The genet size of this species was small and no larger than 0.5 m.Two hundred and ten sporocarps of C. rulilus and 260 sporocarps of S. granulatus were collected from Pinus tabulaeformis stand in this study. C. rutilus population was divided into 108 genotypes and formed a large genet of 450 m, and 5. granulatus population was grouped into 99 genotypes and had a large genet of 84 m both based on analysis of RAMS marker.The genetic diversity as determined by Shannon-Weaver diversity index within the population of T. terreum, C. rutilus and S. granulatus were 4.52, 2.92 and 3.87, respectively.It suggests that sexual spore propagation is very important in the life history of the three fungi, particular in T. terreum population, concurrently the population of C. rutilus and S. granulatus spread under ground by clonal mycelium extension.