Original Paper


, Volume 15, Issue 1, pp 25-31

First online:

Mycelial production, spread and root colonisation by the ectomycorrhizal fungi Hebeloma crustuliniforme and Paxillus involutus under elevated atmospheric CO2

  • Petra M. A. FranssonAffiliated withDepartment of Plant and Soil Science, School of Biological Sciences, Aberdeen UniversityDepartment of Forest Mycology and Pathology, SLU Email author 
  • , Andy F. S. TaylorAffiliated withDepartment of Forest Mycology and Pathology, SLU
  • , Roger D. FinlayAffiliated withDepartment of Forest Mycology and Pathology, SLU

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Effects of elevated atmospheric carbon dioxide (CO2) levels on the production and spread of ectomycorrhizal fungal mycelium from colonised Scots pine roots were investigated. Pinus sylvestris (L.) Karst. seedlings inoculated with either Hebeloma crustuliniforme (Bull:Fr.) Quél. or Paxillus involutus (Fr.) Fr. were grown at either ambient (350 ppm) or elevated (700 ppm) levels of CO2. Mycelial production was measured after 6 weeks in pots, and mycelial spread from inoculated seedlings was studied after 4 months growth in perlite in shallow boxes containing uncolonised bait seedlings. Plant and fungal biomass were analysed, as well as carbon and nitrogen content of seedling shoots. Mycelial biomass production by H. crustuliniforme was significantly greater under elevated CO2 (up to a 3-fold increase was observed). Significantly lower concentrations and total amounts of N were found in plants exposed to elevated CO2.


Elevated CO2 Mycelium Ectomycorrhiza Root colonisation Mycelial spread