My general research interest is forest ecology with a focus on functioning of ectomycorrhizal fungi. During my graduate thesis at the Philipps-University of Marburg, Germany, I worked with biodiversity of ectomycorrhizal fungi associated with silver fir (Abies alba Mill.) in the Northern Black Forest. The aim was to gain insight into the fungal succession during forest reestablishment after massive disturbance events like wind throw of a whole forest site.
Inspired by this work I became very interested in studying ectomycorrhizal fungi and their ecological functioning both on a molecular and ecosystem level, which led me to my PhD project at the Department of Forest Mycology and Pathology.
The role of mycorrhizal, extracellular, oxidative enzymes in soil organic matter (SOM) degradation.
Boreal forest ecosystems have a low decomposition rate due to a high input of recalcitrant organic matter for example from evergreen needle trees and ericaceous shrubs. Thus, the photosynthesis rate is higher than decomposition rate, which leads to a sink of carbon.
Carbon is recalcitrantly bound in polyphenolic structures together with nitrogen and phosphorus, which makes tree growth nutrient limited.
The hypothesize of my PhD work is that mycorrhizal fungi play a key role in reallocation of this recalcitrantly bound nitrogen with the help of extracellular peroxidases (manganese peroxidases, ClassII). These genes are commonly known and well studied in white rot wood decomposing fungi. With their high redox potential they have the capacity to oxidize and decompose complex polyphenolic structures like lignin or condensed tannins. Manganese peroxidase activity is often measured in humus and soil, where wood decomposers are absent. In my first paper we recovered 20 ClassII peroxidase-encoding genes, from a phylogenetically wide range of ectomycorrhizal fungi. To investigate if these genes are actively expressed in the field, two nutrient poor forest sites, a subarctic birch forest in Abisko, Lappland, Sweden and a ‘typical’ boreal forest in Jädraås, middle Sweden, were sampled.
Bödeker ITM, Donges K, Schulerowitz K, Cremer E, Rexer K-H, Kost G 2006 Biodiversity of ectomycorrhizal fungi associated with the silver fir on a Vivian/Wiebke wind throw area.
Graduate thesis at AG Kost, Philipps University Marburg, Germany
Bödeker ITM, Nygren CMR, Taylor AFS, Olson Å & Lindahl BD 2009 ClassII peroxidase-encoding genes are present in a phylogenetically wide range of ectomycorrhizal fungi. The ISME Journal; 3; 12; 1387-1395
Bödeker ITM, Donges K, Schulerowitz K, Crème E, Rexer K-H, Kost G. 2006 Biodiversity of ectomycorrhizal fungi associated with the silver fir on a Vivian/Wiebke wind throw area.
EVOLTREE-network of excellence Symposium “Community Structure and Dynamics”, Marburg, Germany 11-13 October 2006 (Poster)
Bödeker ITM, Nygren CMR, Taylor AFS, Olson Å, Lindahl BD, 2008 Fungal ClassII Peroxidases in ectomycorrhizal fungi.
8th International Peroxidase Symposium, 20. - 23. August 2008, Tampere, Finland (Oral presentation)
Bödeker ITM, Nygren CMR, Taylor AFS, Olson Å, Lindahl BD 2008 Fungal ClassII Peroxidases in ectomycorrhizal fungi;
The 21st New Phytologist Symposium: The ecology of ectomycorrhizal fungi,
CEFE-CNRS, Montpellier, France 10-12 December 2008”, (Poster)
Won runner up price of best poster.
Bödeker ITM, Clemmensen KE, de Boer W, Olson Å, Lindahl BD 2010 ClassII peroxidases from ectomycorrhizal fungi in soil organic matter decomposition.
IMC9, The biology of Fungi, Edinburgh, UK, 1-6 August 2010 (Oral presentation)
Björn Lindahl, Karina Clemmensen and Åke Olson at Forest Mycology and Patholgy (supervisors)
Andy Taylor at the Macaulay Landuse Research Institute, Aberdeen, Scottland, UK (co-author)
Cajsa Lithell (Nygren) at Forest Mycology and Pathology (co-author)
Wietse de Boer, NIOO-KNAW, TME group, Heteren, Netherlands (enzyme activity analysis)