Campus

 

Michael R. Schläppi

Associate Professor
Wehr Life Sciences, 207
(414) 288-1480
E-mail

Diploma 1986, University of Basel, Switzerland 
Ph.D. 1990, University of Basel, Switzerland 
Postdoctoral Fellow, Carnegie Institute of Washington 


 

Cold Tolerance and Flowering Time Regulation in Plants

We have molecular and genetic projects to investigate cold tolerance and flowering time regulation in the model plants Arabidopsis (Arabidopsis thaliana) and, more recently, rice (Oryza sativa). We are currently focusing on exploring the natural variation that exists in rice to map new quantitative trait loci (QTLs) for various cold tolerance traits. Toward this goal we are using a sophisticated method to screen the US Department of Agriculture mini-core collection of rice, which represents the diversity and complexity of the world’s germplasms. Our preliminary results are consistent with the hypothesis that cold tolerance measured in various ways is genetically controlled. Our long-term goals are to field-test our laboratory results, to introgress large-effect QTLs into elite rice lines, to fine-map interesting QTLs, and to identify genes associated with them. In parallel we are exploring the natural variation of Arabidopsis to study specific aspects of stress tolerance and flowering time regulation, specifically focusing on hybrid proline and glycine-rich protein (HyP/GRP) and FRIGIDA-LIKE (FRL) genes.

For more details on projects, please click on research program.

 

Selected Publications


Xin, N., Li, Y.J., Li, X., Wang, X., Li, Y., Zhang, X., Dai, R.J., Meng, W.W., Wang, H.L., Ma, H., Schläppi, M., and Deng, Y.L. 2012. Dragon's blood may have radioprotective effects in radiation-induced rat brain injury. Radiat Res. 178(1):75-85.

Li, L., Zhang, C., Xu, D., Schläppi M., Xu, Z.Q.  2012. Expression of recombinant EARLI1, a hybrid proline-rich protein of Arabidopsis, in Escherichia coli and its inhibition effect to the growth of fungal pathogens and Saccharomyces cerevisiae. Gene. 10;506(1):50-61.

Zhang, X., Xu, Z-Y., Schläppi M., and Xu, Z-Q. 2011. Inhibition of Arabidopsis AZI1 to the growth of Saccharomyces cerevisiae and infection of Botrytis cinerea of garlic sprout. Plant Physiol. J. 47: 57-62.

Li, C., Wang, Y., Liu, L., Hu, Y., Zhang, F., Mergen, S., Wang, G., Schläppi, MR., and Chu, C. 2011. A rice plastidial nucleotide sugar epimerase is involved in galactolipid biosynthesis and improves photosynthetic efficiency. PLoS Genetics, 7: e1002196. doi:10.1371/journal.pgen.1002196.

Xu, D., Huang, X., Xu, ZQ., and Schläppi, M. 2011. The HyPRP gene EARLI1 has an auxiliary role for germinability and early seedling development under low temperature and salt stress conditions in Arabidopsis thaliana. Planta, doi:10.1007/s00425-011-1425-9.

Shi, Y. Zhang, X., Xu, ZY., Li, L., Zhang, C., Schlappi, M., and Xu, ZQ.  2011.  Influence of EARLI1-like genes on flowering time and lignin synthesis of Arabidopsis thaliana Plant Biology, 13: 731-739.

Xu, ZY., Zhang, X., Schläppi, M., and Xu, ZQ. 2011. Cold-inducible expression of AZI1 and its function in improvement of freezing tolerance of Arabidopsis thaliana and Saccharomyces cerevisiae. J Plant Physiol, 168: 1576-1587. 

Xin, N., Li, YJ., Dai, RJ., Meng, WW., Chen, Y., Schlappi, M., and Deng, YL. 2011. Dragon’s Blood extract has antithrombotic properties, affecting platelet aggregation functions and anticoagulation activities. J Ethnopharmacol, 135: 510-514. 

Schläppi, M. 2011.  Genetic and physiological analysis of biennialism in Hyoscyamus nigerPlant Biology, 13: 534-540. 

Wang, J., Tian, N., Huang, X., Chen, LY., Schläppi, M., and Xu, ZQ.  2009. The tall fescue turf grass class I chitinase gene FaChit1 is activated by fungal elicitors, dehydration, ethylene, and mechanical wounding. Plant Mol Biol Rep, 27: 305-314. 

 

Meeting Presentations

Schläppi, M. 2011.  The HyPRP gene EARLI1 has an auxiliary role for germinability and early seedling development under low temperature and salt stress conditions. ICAR Abstract #150, 22nd International Conference on Arabidopsis Research, Madison, WI, June 22-25, 2011.

 

Invited Talks

Understanding cold stress tolerance in Arabidopsis and rice. Chinese Academy of Sciences, Institute of Botany, Beijing, China, April 28, 2011.

The role of hybrid proline-rich proteins in plant stress protection pathways. Chinese Academy of Sciences, Institute of Genetics and Developmental Biology, Beijing, China, June 23, 2010.

Courses

Biol 1002 - General Biology

Biol 8201 - Developmental Genetics and Epigenetics

Biol 8202 - Eukaryotic Genetics and Chromosome Structure

Biol 8954 - Seminar in Plant Molecular Biology 

 

Current Students

Yao Shi (Ph.D. student)

 

Dr. Schlappi is currently accepting new Ph.D. students into his lab

 

Former Students

 

Jason A Bubier, 2004, Ph.D.

Ying Pan, 2005, Ph.D.

Richard K Wilkosz, 2001, Ph.D. 

Yi Zhang, 2007, Ph.D. 

Ranjuna Weerasekera, 2009, M.S.

Monica K Patel, 2001, M.S. 

 



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Biological Sciences Department

Marquette University, Wehr Life Sciences
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Milwaukee, WI 53201-1881
(414) 288-7355
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