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Development of Ectomycorrhizae in a Douglas-Fir Nursery: I. Seasonal Characteristics

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Ectomycorrhizae on Douglas-fir seedlings in fumigated soil were classified as smooth (S-myc) or tomentose (T-myc) according to the texture and color of their mantles. S-myc, which formed more rapidly than T-myc, were present on all seedlings at the 1 + 0 stage. T-myc were present on 22 percent of 12-week-old and 46 to 69 percent of 1 + 0 seedlings. The increase in T-myc during the second growing season was studied. The number of T-myc per g dry weight of roots rose during May and June, coincident with the seasonal rise in soil temperature, to a mean level that also characterized seedlings collected in July, August, and at the 2 + 0 stage (112-128 per g). The number of T-myc per seedling, however, increased in proportion to root weight throughout the growing season. Variation in mycorrhizal abundance within and between sample groups of seedlings was great at all stages of seedling development. Potential opportunities for manipulating mycorrhizal fungi in previously fumigated soil exist during the first several weeks of seedling growth, before indigenous fungal symbionts extensively colonize the root systems. Forest Sci. 20:51-56.

Keywords: Inocybe lacera; Laccaria laccata; Pseudotsuga menziesii; Symbiosis; soil microbiology

Document Type: Journal Article

Affiliations: Associate Professor, Department of Plant Pathology, Cornell University, Ithaca, New York 14850

Publication date: March 1, 1974

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