New Phytologist
1998. 139(2) 331-339

Multiple host fungi are the most frequent and abundant ectomycorrhizal types in a mixed stand of Douglas-fir (Pseudotsuga menziesii D. Don) and bishop pine (Pinus muricata D. Don).

Thomas R. Horton1 and Thomas D. Bruns
Department of Plant and Microbial Biology, 111 Koshland Hall, University of California, Berkeley, California, 94720, USA

1Corresponding author's current address:
Department of Forest Science, Oregon State University, Corvallis, OR 97331, USA
email: hortont@ccmail.orst.edu
Abstract
The ectomycorrhizal fungal associations of Douglas fir (Pseudotsuga menziesii D. Don) and bishop pine (Pinus muricata D. Don) were investigated in a mixed forest stand. We identified fungi directly from field collected ectomycorrhizal (ECM) root tips using PCR-based methods. Sixteen species of fungi were found, of which twelve associated with both hosts. Rhizopogon parksii Smith was specific to Douglas-fir. Three other species colonized only one of the hosts, but were too infrequent to draw conclusions about specificity. Seventy-four percent of the biomass of ECM root tips sampled in the stand were colonized by members of the Thelephoraceae and Russulaceae. All 12 species of fungi that associated with both tree species did so within a 10 x 40 cm soil volume, suggesting individual fungal genotypes linked the putatively competing tree hosts.

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