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Abstract Detail

MSA - Systematics/Evolution

Vellinga, Else C [1], Blanchard, Erin P [1], Binder, Manfred [2], Bruns , Thomas [1].

Paxillus in North America.

Paxillus is a small Northern Hemisphere genus in the Boletales; all species are ectomycorrhizal with a broad range of host trees. Paxillus involutus is widely used as a model organism in ectomycorrhizal experiments, as it is one of the few species easily grown in culture. Despite the importance in the forest ecosystem and the abundance of the species, the North American species are not well known. These species, their relationships to the European species and their ecology are now under investigation; the first step is a phylogenetic analysis of the nrITS and the elongation factor 1alpha gene sequence data to recognize and circumscribe the species. Recently, four phylogenetic species were recognized in Europe in the P. involutus complex: P. involutus s. str., P. obscurosporus, P. validus, and one undescribed species. So far, at least four species can be recognized in North America: the occasionally occurring Paxillus involutus s. str., P. vernalis, the most common and widespread species, associating with aspen and oaks in a wide range of habitats, an undescribed conifer associated species with native and with introduced tree species, and a fourth species, also known from Europe, but still nameless, growing with planted birch in the Pacific states. The alder associated species P. filamentosus is a sister taxon to the group of P. involutus, and Paragyrodon sphaerosporus is the closest relative outside the genus.

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1 - University of California, Berkeley, Plant and Microbial Biology Department, 111 Koshland Hall #3102, Berkeley, CA, 94720-3102, U.S.A.
2 - Clark University, Department of Biology, 950 Main Street, Worcester, Massachusetts, 01610, USA

Species recognition
non-native species.

Presentation Type: Poster:Posters for Topics
Session: P2
Location: Event Tent/Cliff Lodge
Date: Tuesday, July 28th, 2009
Time: 5:30 PM
Number: P2SE050
Abstract ID:677