Jeff Leonard
Assistant Professor/Senior Research, Cereal Genetics
  • Germplasm enhancement for the Oregon wheat breeding program.
  • Marker development for marker assisted selection (MAS).
  • Radiation hybrid mapping of the wheat D-genome.
  • Introgression of novel traits from wild wheat relatives.
OSU Campus
Department of Crop and Soil Science
347 Crop Science Bldg
Corvallis, OR 97331
United States
(541) 737-9908


We have two primary areas of research. A large portion of our effort uses marker assisted selection to introduce new traits into the germplasm utilized by the Oregon State Wheat Breeding program. These include both disease resistance and quality traits. We use previously mapped DNA markers as well as develop new markers from genetic maps for this purpose. A second area of interest is the use of Radiation Hybrid mapping to map genomes, chromosomes, and specific genes of interest in wheat. We are currently investigating different methods of mapping and utilizing genes from wild relatives of wheat.


Wang, G., Leonard, J.M., Zitzewitz, J., Peterson A.J., Ross, A.S., and O. Riera-Lizarazu (2014) Marker-trait associations analysis of kernel hardness and related agronomic traits in a core collection of wheat lines. Moleclar Breeding DOI 10.1007/s11032-014-0028-0.

Tiwari, V.J., Riera-Lizarazu, O., Gunn H.L., Lopez, K., Kianian, S.F., and J. M. Leonard (2012) Endosperm Tolerance of Paternal Aneuploidy Allows Radiation Hybrid Mapping of the Wheat D-Genome and a Measure of γ Ray-Induced Chromosome Breaks. PLoS ONE 7(11):e48815.

Wang, G., Leonard, J.M., Ross, A.S., Peterson, C.J., Zemetra R.S., Campbell, K.G., and O. Riera-Lizarazu. (2012) Identification of genetic factors controlling kernel hardness and related traits in a recombinant inbred population derived from a soft × ‘extra-soft’ wheat (Triticum aestivum L.) cross .Theoretical and Applied Genetics 124:207-221.

Riera-Lizarazu,O., Leonard J. M., Tiwari, V.K., and S. F. Kianian. (2010) A Method to Produce Radiation Hybrids for the D-Genome Chromosomes of Wheat (Triticum aestivum L.). Cytogenetic and Genome Research 129:234-240.

Riera-Lizarazu,O., Peterson, C.J., Wang, G., and J. M. Leonard. (2010) Registration of the OS9XQ36 Mapping Population of Wheat (Triticum aestivum L.). Journal of Plant Registrations 4:98-102.

Leonard, J.M., Watson, C.J., Carter, A., Hansen, J., Zemetra R.S., Santra, D.K., Campbell, K.G., and O. Riera-Lizarazu. (2008) Identification of a candidate gene for the wheat endopeptidase Ep-D1 locus and two other STS markers linked to the eyespot resistance gene Pch1. Theoretical and Applied Genetics 116:261-270.

Hoffman, P.D., Leonard, J.M., Lindberg, G.E., Bollmann, S.R., and J.B. Hays. (2004) Rapid accumulation of mutations during seed-to-seed propagation of mismatch-repair-defective Arabidopsis.  Genes & Development. 18: 2676-2685.

Filichkin, S.A., Leonard, J.M., Monteros, A., and H. Nonogaki. (2004) A novel endo-β-mannanase gene in tomato LeMAN5 is associated with pollen maturation and germination. Plant Physiology 134:1080-1087.

Leonard, J.M., Bollmann, S.R. and J.B. Hays. (2003) Reduction of stability of genomic and transgenic DNA-repeat sequences (microsatellites) by inactivation of AtMSH2 mismatch-repair function. Plant Physiology 133:328-338.

Leonard, J.M., S.J. Knapp, and M.B. Slabaugh. (1998) Condensing enzymes from Cuphea wrightii associated with medium chain fatty acid biosynthesis. Plant Journal 13:611-620.

Slabaugh, M.B., Leonard, J.M., and S.J. Knapp. (1998) A Cuphea beta-ketoacyl-ACP synthase shifts the synthesis of fatty acids towards shorter chains in Arabidopsis seeds expressing Cuphea FatB thioesterases. Plant Journal 13:621-628.

Leonard, J.M., S.J. Knapp, and M.B. Slabaugh. (1997) Cuphea wrightii thioesterases have unexpected broad specificities on saturated fatty acids. Plant Molecular Biology 34:669-679.

Slabaugh, M.B., Huestis, G.M., Leonard, J.M., Holloway, J., Rosato, C., Hongtrakul, V., Martini, N., Toepfer, R., Voetz, M., Schell, J., and S.J. Knapp. (1997) Sequence-based genetic markers for genes and gene families: single strand conformational polymorphisms for the fatty acid synthesis genes of Cuphea. Theoretical and Applied Genetics 94:: 400-408.

Slabaugh, M.B., Leonard J.M., Huestis G.M., Crane, J. and S.J. Knapp. (1994) Genetic and biochemical studies of medium chain fatty acid synthesis in Cuphea, in Plant Lipid Metabolism (J-C. Kader and P. Maziak eds.) Kluwer Academic Publishers.