|Position:||Director, David G. Leach Research Station|
|Education:||Ph.D., Michigan State University, Plant Breeding and Genetics/Horticulture|
Adjunct Associate Professor, Department of Horticulture and Crop Sciences, Ohio State University
|Adjunct Associate Professor. Department of Horticulture, Iowa State University|
My job is to manage The Holden Arboretum’s David G. Leach Research Station, a satellite facility maintained for horticultural research on a 30-acre property in Madison, Ohio, 40 minutes east of Holden’s main Kirtland campus. The Leach Station is staffed and equipped to support extensive and diverse display gardens, in addition to large breeding populations and research plots. The station remains committed to breeding and evaluating superior rhododendrons for continental climates (i.e. cold winters and hot summers). In addition, the traditional breeding program is complemented by a research component focused on adaptations of rhododendrons to biotic and abiotic stresses, such as winter freezing injury to leaves and buds, ‘bleaching’ of leaves (photoinhibition) under excessive light, and diseases caused by fungal pathogens (Phytophthora root rot and powdery mildew).
How much natural variation exists among Rhododendron species for tolerance to a particular stress? MORE
What are the genetic and physiological determinants of this tolerance? MORE
Can stress tolerance be transferred via conventional or modern techniques to a new generation of hybrids that have improved landscape performance under stressful conditions? MORE
How is expression of these traits influenced by other key features of woody plant biology, such as juvenility and dormancy? MORE
Peng, Y, W Lin, H Wei, SL Krebs, R Arora (2008) Phylogenetic analysis and seasonal cold acclimation-associated expression of early light-induced protein genes of Rhododendron catawbiense. Physiologia Plantarum132: 44-52. PDF
Jones, JR, TG Ranney, NP Lynch, and SL Krebs (2007) Ploidy levels and relative genome sizes of diverse species, hybrids, and cultivars of rhododendron. Journal of the American Rhododendron Society 61: 220-227. PDF
Kalberer, SR., R Aurora, N Leyva-Estrada, and SL Krebs (2007) Cold hardiness of floral buds of deciduous azaleas: dehardening, rehardening, and endodormancy in late winter. Journal of the American Society for Horticultural Science 132: 73-79. PDF
Wei, H, AL Dhanaraj, LJ Rowland, Y Fu, SL Krebs, and R. Arora (2005). Comparative analysis of expressed sequence tags from cold-acclimated and non-acclimated leaves of Rhododendron catawbiense Michx. Planta 221: 406-416. PDF
Krebs, SL (2005). Loss of winter hardiness in R. ‘Supernova’, an artificial polyploid. J. American Rhododendron Society 59: 74-75.
Marian, CO, SL Krebs and R Arora (2004). Dehydrin variability among Rhododendron species: a 25- kDa dehydrin is highly conserved and associated with cold acclimation across diverse species. New Phytologist 161: 773-780. PDF
Krebs, SL and M Wilson (2002) Resistance to Phytophthora root rot among contemporary rhododendron cultivars. HortScience 37: 790-792. PDF
Lim, CC, SL Krebs, R Arora (1999) A 25 kD dehydrin associated with genotype- and age-dependent leaf freezing tolerance in Rhododendron: a genetic marker for cold hardiness? Theoretical and Applied Genetics 99: 912-920. PDF
Krebs, SL (1996) Normal segregation of allozyme markers in complex rhododendron hybrids. Journal of Heredity 87:131-135.