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Lack of mycorrhizal specificity by the ericaceous hosts arbutus menziesii and arctostaphylos uva ursi


, : Lack of mycorrhizal specificity by the ericaceous hosts arbutus menziesii and arctostaphylos uva ursi. New Phytologist 90(3): 495-510

Twenty-eight cultures of ectomycorrhizal fungi isolated from diverse host and habitat associations were tested in pure culture syntheses with the ericaceous hosts A. menziesii Pursh and A. uva-ursi (L.) Spreng. All but 3 of the fungi formed arbutoid mycorrhizas. Sheathing fungal mantles, Hartig net penetration and intracellular colonization were well developed on most mycorrhizas. Ectomycorrhizal fungi form arbutoid mycorrhizas and these particular hosts are broadly receptive towards fungal associates. The significance of these results with respect to ecological and practical implications and better understanding of ectomycorrhizal specificity is emphasized. Arbutoid mycorrhizas are most closely related to ectomycorrhizas than to ericoid mycorrhizas.

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