A new hypothesis to explain allocation of dry matter between mycorrhizal fungi and pine seedlings in relation to nutrient supply

By H. Wallander. Plant and Soil, 2004

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Belowground ectomycorrhizal fungal community change over a nitrogen deposition gradient in Alaska (2002, methodology): “The weak relationship could arise from decreased host carbon (C) allocation to roots (Björkman 1949, Ericsson 1995), in- creased C costs of assimilation of NH41 into C skeletons (Wallander 1995), or lower fungal allocation to reproductive vs. vegetative structures.”
Ectomycorrhizal fungal taxa differing in response to nitrogen deposition also differ in pure culture organic nitrogen use and natural abundance of nitrogen isotopes (2002, unknown): “to hosts would be energetically favorable to the fungus, as the carbon cost of N assimilation (Wallander, 1995) would be borne directly by the tree.”
Resource stoichiometry elucidates the structure and function of arbuscular mycorrhizas across scales. (2010, background): “But in P-rich systems, where symbiotic C-for-P trade is not advantageous, N enrichment will exacerbate fungal C demand (Wallander, 1995) and may generate plant growth depression (N.”