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Master Thesis

Phylogénie de champignons associés aux symbioses plante/fourmis

Abstract : Symbioses are very tight interactions between two or more associates. They often lead to the diversification of the involved groups. Recent studies have shown that fungi belonging to the order Chaetothyriales live in symbiosis with ants, in particular in ant/plant symbioses (in which the plant provides the ants with nesting cavities and the ants in return protect the plant against herbivores) and in the carton structures built by numerous tree-nesting ants. Evolutionary convergences account for most of the diversity in ant/plant symbioses, with very few radiations. A multilocus phylogeny constructed during this study traces the evolutionary history of 81 strains of Chaetothyriales associated with ants. These strains cluster in three clades. In consequence, diversification in this group results from a small number of independent appearances of association with ants followed by evolutionary radiations, which is an evolutionary pattern very different from that shown by both associated ants and plants. In these systems, it is not co-speciation but host switching that explains symbiont diversity. Other associations involving Chaetothyriales and ants have been described. It is thus possible that a significant part of the order's diversification could be linked to the evolution of association with ants.
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Master Thesis
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Submitted on : Friday, December 7, 2012 - 10:00:51 AM
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  • HAL Id : dumas-00762381, version 1

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Marie Vasse. Phylogénie de champignons associés aux symbioses plante/fourmis. Sciences agricoles. 2012. ⟨dumas-00762381⟩

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