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Phone: (612) 625-1234
Fax: (612) 625-1738

Department of Plant Biology
University of Minnesota
250 Biological Science Center
1445 Gortner Ave.
St. Paul, MN 55108

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Imke Schmitt

Assistant Professor, Department of Plant Biology
Curator of Lichenized Fungi, Bell Museum of Natural History
Ph.D. Essen University 2002

Evolution of lichenized fungi, molecular phylogenetics, symbiosis, fungal systematics, evolution of biosyntheic genes

Contact Information

Mailing Address:

Dr. Imke Schmitt
Department of Plant Biology
University of Minnesota
250 Biological Sciences Center
1445 Gortner Avenue
St. Paul, MN 55108

Office: 812 Biological Sciences Center
Phone: (612) 624-5428
Lab: (612) 624-4044
Fax: (612) 625-1738
E-Mail: schm2109@umn.edu

Research Interests

I study the evolution of fungi involved in the lichen symbiosis. Lichens are intriguing fungal-green algal-cyanobacterial associations, whose evolutionary history and biology are little understood. It is unclear, for instance, why lichenized fungi produce such a great variety of uncommon secondary metabolites, when closely related non-lichenized fungi do not. What could be the functions of these small molecules in the lichen symbiosis? I am interested in using molecular phylogenetics as a tool to study such questions. Basis for the analyses are DNA sequences, morphological, and chemical data. We explore the evolutionary history of morphological and chemical characters by mapping them on molecular trees. We have shown, for example, that basic concepts of fungal classification based on fruiting body morphology, the single most important character in fungal systematics, have to be reviewed, if the evolution of lichenized as well as non-lichenized taxa is considered. Also, we study functionally significant gene families, such as polyketide synthase genes directly. Proteins encoded by these genes are predicted to be involved in the biosynthesis of rare and bioactive molecules produced by lichenized fungi. We are currently analyzing the complex evolutionary history of these genes, which involves duplications and possibly horizontal gene transfer.

Selected Publications

Schmitt, I., Kautz, S. & Lumbsch, H.T. 2007. 6-MSAS-like polyketide synthase genes occur in lichenized ascomycetes. Mycol. Res. Available online.

Lumbsch, H.T., Schmitt, I., Barker, D. & Pagel, M. 2006. Evolution of micromorphological and chemical characters in the lichen-forming fungal family Pertusariaceae. Biol. J. Linn. Soc. 89: 615-626.

Schmitt, I., Lumbsch, H.T. & Mueller, G. 2005. Ascoma morphology is homoplaseous and phylogenetically misleading in some pyrenocarpous lichens. Mycologia 97: 362-374.

Schmitt, I., Martin, M.P., Kautz, S. & Lumbsch, H.T. 2005. Diversity of non-reducing  polyketide synthase genes in the Pertusariales (lichenized Ascomycota): a phylogenetic perspective. Phytochemistry 66: 1241-1253.

Lumbsch, H.T., Schmitt, I., Lindemuth, R., Miller, A., Mangold, A., Fernandez, F. & Huhndorf, S. 2005.  Performance of four ribosomal DNA regions to infer higher-level phylogenetic relationships of inoperculate euascomycetes (Leotiomyceta). Mol. Phylogenet. Evol. 34: 512-524.

Schmitt, I. & Lumbsch, H.T. 2004. Molecular phylogeny of the Pertusariaceae supports secondary chemistry as an important systematic character set in lichen-forming ascomycetes. Mol. Phylogenet. Evol. 33: 43-55.

Lumbsch, H.T., Schmitt, I., Palice, Z., Ekman, S. & Wedin, M. 2004. Supraordinal phylogenetic relationships of Lecanoromycetes based on a Bayesian analysis of combined nuclear and mitochondrial sequences. Mol. Phylogenet. Evol. 31: 822-832.

Schmitt, I., Lumbsch, H.T. & Søchting, U. 2003. Phylogeny of the lichen genus Placopsis (Agyriales) and its allies based on Bayesian analyses of nuclear and mitochondrial sequence data. Mycologia 95: 827-835.

Schmitt, I., Mangold, A. & Lumbsch, H.T. 2002. Potential use of tRNA primers for fingerprinting in molecular lichen ecology and biogeography. Nova Hedwigia 74: 69-74.

Schmitt, I. & Lumbsch, H.T. 2001. Identification of the photobionts in Trapeliopsis and Pertusaria using SSU ribosomal DNA sequences obtained from PCR amplification with a non-green-algal primer. Mycotaxon 78: 407-411.

Heibel, E., Lumbsch, H.T. & Schmitt, I. 1999. Genetic variation of Usnea filipendula (Parmeliaceae) populations in western Germany investigated by RAPDs suggests reinvasion from various sources. Am. J. Bot. 86: 753-757.