title: Reciprocal carbon and nitrogen transfer between an ericaceous dwarf shrub and fungi isolated from Piceirhiza bicolorata ectomycorrhizas.
abstract: The overstorey coniferous trees and understorey ericaceous dwarf shrubs of northern temperate and boreal forests have previously been considered to form mycorrhizas with taxonomically and functionally distinct groups of fungi. Here, we tested the hypothesis that Meliniomyces variabilis and Meliniomyces bicolor, isolated from Piceirhiza bicolorata ectomycorrhizas of pine, can function as ericoid mycorrhizal symbionts with Vaccinium vitis-idaea. We used split-compartment microcosms to measure the reciprocal exchange of (13)C and (15)N between V. vitis-idaea and three fungal isolates in the Hymenoscyphus ericae aggregate isolated from Scots pine ectomycorrhizas (M. variabilis and M. bicolor) or Vaccinium roots (M. variabilis). The extramatrical fungal mycelium of labelled mycorrhizal plants was significantly enriched in (13)C, and the leaves were significantly enriched in (15)N, compared with nonmycorrhizal and nonlabelled controls. * These findings show for the first time that fungi in the H. ericae aggregate, isolated from pine ectomycorrhizas, can transfer C and N and can thus form functional ericoid mycorrhizas in an understorey ericaceous shrub.
authors.affiliation: Institute of Biological and Environmental Sciences, University of Aberdeen, Aberdeen AB24 3UU, UK.|The Macaulay Institute, Craigiebuckler, Aberdeen AB15 8QH, UK.
authors.forename: Gwen-Aëlle
authors.initials: GA
authors.lastname: Grelet
authors.affiliation: Institute of Biological and Environmental Sciences, University of Aberdeen, Aberdeen AB24 3UU, UK.
authors.forename: David
authors.initials: D
authors.lastname: Johnson
authors.affiliation: The Macaulay Institute, Craigiebuckler, Aberdeen AB15 8QH, UK.
authors.forename: Eric
authors.initials: E
authors.lastname: Paterson
authors.affiliation: The Macaulay Institute, Craigiebuckler, Aberdeen AB15 8QH, UK.|Centre for Plant and Food Science, University of Western Sydney, Locked Bag 1797, Penrith South DC, NSW 1797, Australia.
authors.forename: Ian C
authors.initials: IC
authors.lastname: Anderson
authors.affiliation: Institute of Biological and Environmental Sciences, University of Aberdeen, Aberdeen AB24 3UU, UK.
authors.forename: Ian J
authors.initials: IJ
authors.lastname: Alexander