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Ectomycorrhizal Inoculation of Containerized Douglas-fir and Lodgepole Pine Seedlings with Six Isolates of Pisolithus tinctorius

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Containerized Douglas-fir and lodgepole pine seedlings grown under lowered fertility were inoculated with vegetative mycelium from six isolates of the ectomycorrhizal fungus Pisolithus tinctorius. The isolates differed both culturally and in effectiveness as ectomycorrhizal inoculum. The percent of seedlings successfully inoculated and percent of feeder roots colonized differed significantly among the isolates. Analysis of variance, however, for seedling height, stem diameter, stem and root dry weights, and top/root ratio showed no significant differences between any inoculation treatment and controls for either tree species. This study reinforces the concept that a wide array of fungus ecotypes should be tested before a specific strain is selected for wide-scale nursery inoculations. Forest Sci. 25:585-590.

Keywords: Pinus contorta; Pseudotsuga menziesii; forest regeneration

Document Type: Journal Article

Affiliations: Botanist at USDA Forest Service, Pacific Northwest Forest and Range Experiment Station, Portland, Oregon 97208

Publication date: December 1, 1979

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