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Abstract Detail


MSA - Systematics/Evolution

Wilson, Andrew [1], Binder, Manfred [1], Hibbett, David [1].

Diversity and evolution of ectomycorrhizal host associations in Sclerodermatineae (Boletales, Basidiomycota).

The Sclerodermatineae (Boletales, Basidiomycota) is an ectomycorrhizal lineage with members that are known to associate with a diverse range of plant hosts. This study attempts to reconstruct ancestral host relationships within the Sclerodermatineae in order to identify patterns of host associations. To do this, we created a comprehensive phylogeny for the Sclerodermatineae. An initial phylogeny of the Sclerodermatineae, produced from a supermatrix of nrRNA and protein coding sequences, was combined with ITS phylogenies of Astraeus, Calostoma and Pisolithus using supertree methods. Next, a literature search was performed to identify ectomycorrhizal hosts for Sclerodermatineae taxa. Ancestral state reconstructions were performed using parsimony and maximum likelihood methods in order to estimate the ectomycorrhizal host for ancestors of Sclerodermatineae lineages.
The combination of phylogenetic methods produced a 168 OTU tree representing the most inclusive phylogeny for the Sclerodermatineae to date. Results of the literature search described the Sclerodermatineae associating with up to 13 plant families. However methods of determining ectomycorrhizal hosts for fungal taxa were found to differ in their level of objectivity. These differences were taken into account when coding for host states in ancestral state reconstructions. The results of ancestral host reconstructions were mostly ambiguous. However, some patterns were observed. One result suggests the root of the phylogeny was ectomycorrhizal with gymnosperms, while Calostoma and Pisolithus ancestors were with angiosperms. Although this study demonstrated that some Calostoma species are ectomycorrhizal with members of the Myrtaceae, ancestral state reconstructions predicted that Calostoma’s ancestor associated with the Fagaceae.


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1 - Clark University, Department of Biology, 950 Main Street, Worcester, Massachusetts, 01610, USA

Keywords:
ectomycorrhizal fungi
evolution
supertree
phylogeny
Pisolithus
Sclerodermatineae
Calostoma.

Presentation Type: Oral Paper:Papers for Topics
Session: 29
Location: Cottonwood D/Snowbird Center
Date: Monday, July 27th, 2009
Time: 3:45 PM
Number: 29001
Abstract ID:837


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