Title |
The relative ages of ectomycorrhizal mushrooms and their plant hosts estimated using Bayesian relaxed molecular clock analyses
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Published in |
BMC Biology, March 2009
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DOI | 10.1186/1741-7007-7-13 |
Pubmed ID | |
Authors |
David S Hibbett, P Brandon Matheny |
Abstract |
Ectomycorrhizae (ECM) are symbioses formed by polyphyletic assemblages of fungi (mostly Agaricomycetes) and plants (mostly Pinaceae and angiosperms in the rosid clade). Efforts to reconstruct the evolution of the ECM habit in Agaricomycetes have yielded vastly different results, ranging from scenarios with many relatively recent origins of the symbiosis and no reversals to the free-living condition; a single ancient origin of ECM and many subsequent transitions to the free-living condition; or multiple gains and losses of the association. To test the plausibility of these scenarios, we performed Bayesian relaxed molecular clock analyses including fungi, plants, and other eukaryotes, based on the principle that a symbiosis cannot evolve prior to the origin of both partners. As we were primarily interested in the relative ages of the plants and fungi, we did not attempt to calibrate the molecular clock using the very limited fossil record of Agaricomycetes. |
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Geographical breakdown
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Netherlands | 3 | 2% |
Brazil | 3 | 2% |
United Kingdom | 3 | 2% |
Germany | 2 | 1% |
Australia | 1 | <1% |
Finland | 1 | <1% |
Sweden | 1 | <1% |
Israel | 1 | <1% |
Other | 1 | <1% |
Unknown | 179 | 90% |
Demographic breakdown
Readers by professional status | Count | As % |
---|---|---|
Researcher | 39 | 20% |
Student > Ph. D. Student | 36 | 18% |
Student > Master | 30 | 15% |
Student > Bachelor | 19 | 10% |
Professor > Associate Professor | 11 | 6% |
Other | 38 | 19% |
Unknown | 27 | 14% |
Readers by discipline | Count | As % |
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Biochemistry, Genetics and Molecular Biology | 14 | 7% |
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Earth and Planetary Sciences | 2 | 1% |
Other | 3 | 2% |
Unknown | 32 | 16% |