Genetic diversity of ectomycorrhizal Basidiomycetes from African and Indian tropical rain forests |
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Authors: | Taiana Riviere Abdallah G Diedhiou Moussa Diabate G Senthilarasu K Natarajan Annemieke Verbeken Bart Buyck Bernard Dreyfus Gilles Bena Amadou M Ba |
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Institution: | UMR 113, Symbioses Tropicales et Méditerranéennes (LSTM), 34998, Montferrier-sur-Lez, France. taianariviere@yahoo.co.uk |
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Abstract: | Ectomycorrhizal (ECM) fungi have a worldwide distribution. However, the ecology of tropical ECM fungi is poorly documented,
limiting our understanding of the symbiotic associations between tropical plants and fungi. ECM Basidiomycete diversity was
investigated for the first time in two tropical rain forests in Africa (Western Upper Guinea) and in Asia (Western Ghats,
India), using a fragment of the mitochondrial large subunit rRNA gene to type 140 sporocarps and 54 ectomycorrhizas. To evaluate
taxonomic diversity, phylogenetic analyses were performed, and 40 sequences included from identified European specimens were
used as taxonomic benchmarks. Five clades were recovered corresponding to six taxonomic groups: boletoids, sclerodermatoids,
russuloids, thelephoroids, and a clade grouping the Amanitaceae and Tricholomataceae families. Our results revealed that the
Russulaceae species display a great diversity with several putative new species, especially in Guinea. Other taxonomic issues
at family/section levels are also briefly discussed. This study provides preliminary insights into taxonomic diversity, ECM
status, and biogeographic patterns of ECM fungi in tropical two rain forest ecosystems, which appear to be as diverse as in
temperate and boreal forests. |
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Keywords: | Ectomycorrhizal Basidiomycetes Tropical rain forests Mitochondrial LrRNA gene |
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