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- Title
Translocation of <sup>32</sup>P between interacting mycelia of a wood-decomposing fungus and ectomycorrhizal fungi in microcosm systems.
- Authors
Lindah, Björn; Stenlid, Jan; Olsson, Stefan; Finlay, Roger
- Abstract
Interactions between saprotrophic and ectomycorrhizal fungi have been largely ignored, although their mycelia often share the same microsites. The mycelial systems show general similarity to each other and, although the enzymatic potential of the saprotrophic fungi is generally considered to be higher, the importance of organic nutrient sources to ectomycorrhizal fungi is now widely accepted. In the experiments described here, nutritional interactions involving transfer of elements from one mycelium to the other have been monitored dynamically using radioactive tracers and a non-destructive electronic autoradiography system. Microcosms were used in which mycelial systems of the ectomycorrhizal fungi <em>Suillus variegatus</em> and <em>Paxillus involutus</em>, extending from <em>Pinus sylvestris</em> host plants, were confronted with mycelia of the saprotroph <em>Hypholoma fasciculare</em> extending from wood blocks. The fungi showed a clear morphological confrontation response. The mycorrhizal mycelium often formed dense patches over the <em>Hypholoma</em> mycelia. Up to 25% of the 32P present in the <em>Hypholoma</em> mycelium was captured by the mycorrhizal fungi and translocated to the plant host within 30 d. The transfer of 32P to the saprotroph from labelled mycorrhizal mycelium was one to two orders of magnitude lower. The significance of this transfer as a `short cut' in nutrient cycling is discussed.
- Subjects
PHYTOPATHOGENIC fungi in host plants; HYPHOLOMA; STROPHARIACEAE; ECTOMYCORRHIZAS; SCOTS pine; SOIL fungi
- Publication
New Phytologist, 1999, Vol 144, Issue 1, p183
- ISSN
0028-646X
- Publication type
Article