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Disproportionate abundance between ectomycorrhizal root tips and their associated mycelia
1Department of Microbiology, Biological Institute, University of Copenhagen, Copenhagen, Denmark. rasmusk@bi.ku.dk
FEMS Microbiology Ecology
|October 27, 2006
Summary
This study reveals differences in ectomycorrhizal fungal communities between soil mycelia and root tips in a Danish beech forest. Mycelial communities showed more boletoid fungi, while root tips had more russuloid and Cortinarius species.
Area of Science:
- Ecology
- Mycology
- Forest Science
Background:
- Molecular identification has advanced understanding of ectomycorrhizal fungi on fine roots.
- Limited data exists on ectomycorrhizal hyphal species composition in soil.
Purpose of the Study:
- To compare ectomycorrhizal external mycelial communities with adjacent root-tip communities.
- To investigate fungal community structure in a Danish beech forest ecosystem.
Main Methods:
- Used sand-filled in-growth mesh bags to trap external mycelia over 70 days.
- Collected adjacent ectomycorrhizal root-tip samples at mesh bag insertion and retrieval.
- Identified ectomycorrhizal fungi via internal transcribed spacer region sequencing.
Main Results:
- Identified 20, 31 (root tips), and 24 (mycelia) ectomycorrhizal species.
- Boletoid species were more frequent in mycelia than root tips.
- Russuloid and Cortinarius species were less dominant in mycelia compared to root tips; Tomentella species showed equal frequency.
Conclusions:
- Significant discrepancies exist between root-tip and mycelial views of ectomycorrhizal fungal communities.
- These differences highlight the importance of considering ectomycorrhizal exploration types.
- Understanding both mycelial and root-associated fungi provides a more complete ecological picture.
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