Explore the diversity of Fungi in Amazonia


Labex Ceba, 2012.


Mélanie Roy, UMR EDB.

Scientific partners

  • UMR EcoFoG

Presentation of the project

Explore the diversity of Fungi in Amazonia

Taxonomists and ecologists agree to point out the under-estimation of the tropical fungal diversity (Dickie et al 2008; Croutecuisse, 2009). The diversity of fungal endophyte seems very high in tropical region (Arlond & Lutzoni 2007) but lack of data on taxonomy and ecology of these endophytes limits comparisons between sites. Studies of T Henkel et al in Guyana have revealed a huge diversity in forms, specially for ectomycorrhizal Fungi (Smith et al 2011); and first inventories by R Courtecuisse in Nouragues have mentined new genus for Amazonia (Courtecuisse, 1998). The fisrt objective of this project is to explore the diversity of ecological groups known as rare in Amazonia but often detected by environmental DNA sequencing, in particular endophytes and ectomycorrhizal Fungi.

Explore the functional diversity of Fungi in Amazonia

Fructifications allow identifying the specie of Fungi, localize them and determine some of their functions. For example, ectomycorrhizal Fungi have a different isotopic signature than saprotrophic Fungi; and sampling of mycelium in the vicinity of fructifications allow measuring enzymatic activities of these Fungi, in particular quantifying their laccase, peroxidase, cellulase, hemicellulase and phosphatases activities.the second objective of this project is to characterize the functional state of Fungi, when their mode of nutrition is unknown or uncertain.

Link host-tree diversity and associated Fungi

Patterns of association of Fungi with their host-trees remain largely unknown in Amazonia and recent studies have revealed new species of ectomycorrhizal tress (Dickie et al 2008). Ectomycorrhizal Fungi seem to be generalists (Tedersoo et al 2009) and endophyte Fungi reveal more specificity (Arnold and Herre 2003). The diversity of these two ecological groups has never been compared to the diversity of plants in tropical hotspots like Amazonian forests. This comparison is one of the objective of the METABAR project (ANR), but the analysis of the diversity of these groups are often limited by the identification of species from environmental sequences (Tedersoo et al 2010). The third objective of this project is to produce an inventory of the diversity of the Species of endophyte and ectomycorrhizal species of Fungi on sites where the diversity of trees is known and diversity of Fungi will be estimated with environmental sequencing. As fungal fructifications are short-lived, several sampling campaigns are planified.

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