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Abstract Detail

MSA - Systematics/Evolution

Dentinger, Bryn T.M. [1], Halling, Roy E. [2], Henkel, Terry [3], Desjardin, Dennis [4], McLaughlin, David J. [5], Moncalvo, Jean-Marc [1].

A molecular phylogeny for porcini mushrooms (Boletus edulis and allies) using multiple genes and a “missing link” from Australia.

Porcini (Boletales: Boletaceae: Boletus section Boletus/Edules) are widely consumed fleshy, pored mushrooms (“boletes”) that traditionally are united by a combination of features including spore color, a reticulated texture on the stipe, and mild-tasting, unstaining flesh. The only potential synapomorphy uniting these boletes is the distinctive condition of having a cottony plug of hyphae stuffing the pores prior to spore development. Molecular phylogenetic studies of the Boletales have identified two divergent clades of porcini but failed to provide evidence that together they form a monophyletic group, seemingly contradicting morphology. However, taxon sampling in porcini has concentrated primarily on European species. Notably, many North American porcini are absent from most of these prior studies, even though the known species diversity is greatest there. The phylogeny of porcini and the question of their monophyly can only be addressed with more comprehensive taxonomic sampling. For this study, we gathered a diverse set of Boletaceae, including representatives of most known species of porcini from around the world, and generated DNA sequences from five independent genetic loci for phylogenetic inference. Here we present the most comprehensively sampled and well-supported phylogenetic study of porcini to date. Remarkably, a newly discovered species from Australia that superficially resembles the core species of porcini (e.g., Boletus aereus, B. aestivalis B. edulis, B. pinophilus) provides a phylogenetic “missing link” between the two divergent clades of porcini. The deep phylogenetic root of this enigmatic species presents the intriguing possibility that porcini are an ancient group that originated in the Paleotropics and have since migrated to north temperate regions, although alternative hypotheses cannot be ruled out. The surprising phylogenetic position of the undescribed Australian porcino, linking together two groups that prior molecular data have failed to recover as one, demonstrates the importance of new species discovery to mushroom systematics.

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1 - Royal Ontario Museum, Department of Natural History, 100 Queen\'s Park, Toronto, ON, M5S 2C6, Canada
2 - The New York Botanical Garden, 200 street & Kazimiroff Boulevard, Bronx, ny, 10458, United States of America
3 - Humboldt State University, Department of Biological Sciences, Arcata, CA, 95521, USA
4 - San Francisco State University, Department of Biology, 1600 Holloway Ave., San Francisco, CA, 94132, United States
5 - University of Minnesota, Department of Plant Biology, 250 Biological Sciences Center, 1445 Gortner Ave., St. Paul, MN, 55108, USA

molecular systematics
missing link

Presentation Type: Oral Paper:Papers for Topics
Session: 45
Location: Cottonwood A/Snowbird Center
Date: Tuesday, July 28th, 2009
Time: 10:30 AM
Number: 45002
Abstract ID:404