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Fungal endophytes in woody roots of Douglas‐fir (Pseudotsuga menziesii) and ponderosa pine (Pinus ponderosa)

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The fungal community inhabiting large woody roots of healthy conifers has not been well documented. To provide more information about such communities, a survey was conducted using increment cores from the woody roots of symptomless Douglas‐fir (Pseudotsuga menziesii) and ponderosa pine (Pinus ponderosa) growing in dry forests on the eastern slope of the Cascade Mountains in Washington state, USA. Fungal isolates were cultured on standard media, and then were identified using a combination of molecular and morphological methods. Fungal genera and species identified in this study will provide baseline data for future surveys of fungal endophytes. Examination of internal transcribed spacer (ITS1 and ITS2) and 5.8S rDNA sequences and morphology of cultured fungi identified 27 fungal genera. Two groups predominated: Byssochlamys nivea Westling (20.4% of isolations) and Umbelopsis species (10.4% of isolations). This is the first report of B. nivea within large woody roots of conifers. Both taxa have been previously identified as potential biological control agents. Although some trends were noted, this study found no significant evidence of host species or plant association effects on total recovery of fungal endophytes or recovery of specific fungal taxa.
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Language: English

Document Type: Research Article

Affiliations: 1: USDA-FS, RMRS, Forestry Sciences Laboratory, 1221 S. Main St, Moscow, ID 83843, USA 2: USDA-FS, PNW, 1133 N. Western Ave., Wenatchee, WA 98801, USA 3: Department of Plant Pathology, Washington State University, PO Box 646430, Pullman, WA 99164-6430, USA

Publication date: 2004-08-01

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