Wilson, Andrew , Binder, Manfred , Hibbett, David .
Evolution an biogeography of ectomycorrhizal associations in and enigmatic group of fungi, the Sclerodermatineae (Boletales, Basidiomycota).
The Sclerodermatineae is an enigmatic lineage of ectomycorrhizal fungi whose members are known to associate with a diverse range of plant hosts. Species from Sclerodermatineae genera such as Pisolithus and Scleroderma have been studied for their ability to form ectomycorrhizal relationships with a broad diversity of plant hosts, making them good subjects for re-forestation practices. However, related genera such as Calostoma appear to have developed a narrower range of host associations. Describing the evolution of host association in the group would generate a better understanding of host specificity vs. host generality in this group and, in general, help evaluate the ability of plant and fungal symbionts to diversify their ectomycorrhizal associations.
For this study, phylogenetic analysis of multi-gene datasets was used to study the history of ectomycorrhizal associations in the Sclerodermatineae by correlating associations through biogeographic distribution and evolutionary co-occurrence. A supermatrix of nrRNA and protein sequences consisting of 168 taxa was produced for molecular dating using BEAST. The first step involved analysis of 17 Agaricomycetideae taxa, performed using fossils to calibrate the Suillineae and mycenoid lineages. The second step used dates from the first analysis to calibrate a more inclusive Sclerodermatineae dataset and to estimate the ages for internal lineages. The BEAST tree from the dating analysis was used as input for LaGrange to reconstruct the biogeographic history of the group.
The preliminary results suggest that the basal Sclerodermatineae diversified about 100 MYA while the Core Sclerodermatineae diversified between 40-50 MYA. This corresponds with previous analyses and indicates that the Sclerodermatineae is young enough to have cultivated associations in both Angiosperms and Gymnosperms. At the time of this abstract analysis to finalize dates for the internal nodes in the Sclerodermatineae and to describe the biogeographic history for the group are still ongoing. The results of these will be shared in the presentation, and will be used to reconstruct the evolution of ectomycorrhizal host associations in the Sclerodermatineae.
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1 - Chicago Botanic Garden, Plant Conservation Science: Soil Science, 1000 Lake Cook Rd, Glencoe, IL, 60022
2 - CLARK UNIVERSITY, Department Of Biology, WORCESTER, MA, 01610-1477, USA
Presentation Type: Oral Paper:Papers for Topics
Location: Lindell A/Chase Park Plaza
Date: Monday, July 11th, 2011
Time: 9:45 AM