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Abstract Detail


MSA - Ecology/Pathology

Hill, Lee T. [1], Kennedy, Peter [1].

A molecular and phylogenetic analysis of the structure and specificity of Alnus rubra ectomycorrhizal assemblages.

Ectomycorrhizal (EM) assemblages associated with Alnus spp. are often distinct in composition and richness from other host plants. To examine the EM assemblage associated with A. rubra , a common tree in western coastal North America, we sampled four A. rubra forests varying in age and geographic location in Oregon, USA. From the 364 EM root tip rDNA ITS sequences, we found a total of 13 EM taxa. The five most abundant taxa, Tomentella sp. 3, Alnicola escharoides, Tomentella sp. 1, Lactarius cf. obscuratus, and Alpova diplophloeus, represented 80% of the samples and were present at all four sites. Assemblage structure differed significantly by site age but not geographic location. Younger sites had higher tree density, Frankia frequency, and soil nitrogen than older sites. Phylogenetic analyses revealed that Alnus-associated EM congeners were not closely related, indicating the distinct nature of Alnus EM assemblages is not due to a unique co-evolutionary history.


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1 - Lewis & Clark College, Department of Biology, 0615 SW Palatine Hill Rd, Portland, OR, 97219, USA

Keywords:
Alnus rubra
Ectomycorrhizae
host age
geographic location
Oregon.

Presentation Type: Poster:Posters for Topics
Session: P2
Location: Event Tent/Cliff Lodge
Date: Tuesday, July 28th, 2009
Time: 5:30 PM
Number: P2EP026
Abstract ID:616


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