Ectomycorrhizal mycelia reduce bacterial activity in a sandy soil

Research output: Contribution to journalArticle


Bacterial activity was studied in a growth system containing Pinus contorta seedlings inoculated with different mycorrhizal fungi. Nylon nets enabled separation of soil compartments with extramatrical mycorrhizal hyphae from soil compartments with roots and mycelium. In three separate experiments bacterial activity, estimated as thymidine incorporation, was reduced in soils with Paxillus involutus hyphae compared to controls without mycorrhizal hyphae. This effect was found irrespective of compartments with and without roots were compared. Laccaria bicolor only reduced the activity in one of these three experiments. Thelephora terrestris (tested in two experiments), Laccaria proxima, Suillus variegatus and Hebeloma crustuliniforme (one experiment), also reduced the thymidine and leucine incorporation rates of bacteria. The reduction for these fungi varied between 20% and 50% in all experiments. Numbers of viable bacteria appeared to be reduced by T. terrestris, L. proxima, S. variegatus and H. crustuliniforme in one experiment, while no effect was seen in the other experiments.


Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Biological Sciences


  • Thymidine incorporation, Leucine incorporation, Paxillus involutus, Laccaria bicolor, Ectomycorrhiza, Bacterial activity
Original languageEnglish
Pages (from-to)77-86
JournalFEMS Microbiology Ecology
Issue number2
Publication statusPublished - 1996
Publication categoryResearch