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Department of Horticultural Science
305 Alderman Hall
1970 Folwell Ave.
St. Paul, MN 55108
(612) 624-5300
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| | | Stan Hokanson
Woody Plant Breeding
Associate Professor
Phone: 612.624.1203
Email: hokan017@umn.edu
Address
258 Alderman Hall
1970 Folwell Avenue
St. Paul, MN 55108
Appointment
70% Research, 30% Teaching
Education
B.S. Michigan State University, East Lansing, Mich., 1980
M.S. Michigan State University, 1991, Horticulture (Plant Breeding and Genetics)
Ph.D. Michigan State University, 1995, Horticulture (Plant Breeding and Genetics, and Ecology and Evolutionary Biology)
Research Program
New cultivars have always been the lifeblood of the landscape-nursery industry. In recent years, plant patenting, product branding and marketing activities have intensified, and many new players are now engaged in the plant-development process. This transformation has given us pause to consider; as a public, academic institution, what is our unique role in the system?
Flowering spicebush in a native stand in Michigan.
Our overarching objective will continue to be the development of new and improved trees and shrubs for USDA plant hardiness zones 3 and 4. Our approach to this objective involves a systematic process of traditional breeding, selection and evaluation. For our more developed breeding projects, including deciduous azalea and weigela, the process assumes the form of recurrent phenotypic selection, in which meritorious individuals from each generation are selected for cultivar potential and used as parents in subsequent generations. These selections are based on data collected over multiple years. For new breeding initiatives, such as our ongoing efforts with clove current (Ribes aureum var. villosum) and spicebush (Lindera benzoin), the process begins with a germplasm evaluation of large numbers of seedlings that originate in the northern-most location we can identify for the taxa in question. Such evaluations give us a sense for the taxa’s range of possible qualities, and allow us to begin selecting parents for the breeding process. Another role we can play in the cultivar-development process involves researching the genetic and physiological processes that control certain traits of woody landscape plants. Such studies are often undertaken by graduate students as thesis and dissertation projects.
Current Graduate Student Research
Andrea Clark is conducting an evaluation of resistance for black-spot disease in roses, and investigating the potential for using molecular markers linked to resistance genes to breed durably resistant roses.
Garrett Beier is developing an understanding of the epidemiology of golden canker, a devastating disease of pagoda dogwood (Cornus alternifolia). He is also developing a high-throughput screening process for identifying resistant seedlings.
Laci High is working to determine the genetic and physiological basis for bypass shoot development in cold hardy elepidote rhododendron germplasm (Rhododendron subg. Hymenanthes). Bypass shoots are vegetative branches that begin growing as the flower buds open, effectively obscuring the flower display.
Will Kusch’s research involves an evaluation of Alnus and Salix germplasm for its potential as a source of cellulosic-derived ethanol. The germplasm is being evaluated in five Minnesota locations for its growth potential and will be tested in the laboratory for ethanol yield.
Teaching Responsibilities
Hort 1015 Woody and Herbaceous Plants (woody plant half)
Hort 4015 Flowering Woody Trees and Shrubs (May session even years)
Publications
- Whitaker, V.M. and S.C. Hokanson. 2009. Partial resistance to black spot disease in diploid and tetraploid roses: general combining ability and implications for breeding and selection. Euphytica DOI : 10.1007/s10681-009-9976-6.
- Whitaker, V.M., J.M. Bradeen, and S.C. Hokanson. 2007. Distribution of Rose Black Spot (Diplocarpon rosae) Genetic Diversity in Eastern North America Using Amplified Fragment Length Polymorphism and Implications for Resistance Screening. J. Amer. Soc. Hort. Sci. 132:534-540.
- Whitaker, V.M., K. Zuzek, and S.C. Hokanson. 2007. Resistance of Twelve Rose Genotypes to Fourteen Isolates of Diplocarpon rosae Wolf (Rose Blackspot) Collected from Eastern North America. Plant Breeding. 126:83-88
- Whitaker, V.M., K. Zuzek, J.M. Bradeen, and S. C. Hokanson. 2007. Culturing and long-term storage of virulent races of the rose blackspot pathogen, Diplocarpon rosae. Acta Hort. 751:199-205.
- Zuzek, K. and S.C. Hokanson. 2007. Cultivar development of shrub roses at the university of minnesota horticultural research center. Acta Hort. 751:291-298.
- Zlesak, D.C., K. Zuzek, and S.C. Hokanson. 2007. Rose pollen viability over time at varying storage temperatures. Acta Hort. 751:337-343.
- McNamara, S., K. Zuzek, N. Rose, H. Pellett, and S.C. Hokanson. FirefallTM Freeman Maple. 2005. HortScience 40:269-271.
- Gardner, N. and S.C. Hokanson. 2005. Intersimple Sequence Repeat Fingerprinting and Genetic Variation in a Collection of Clematis Cultivars and Commercial Germplasm. HortScience 40:1982-1987.
- Hokanson, S.C., S. McNamara, K. Zuzek, N. Rose, and H. Pellett. 2005. Rhododendron ‘Candy Lights’ and R. ‘Lilac Lights’. HortScience 40:1925-1927.
Book chapters
- Whitaker, V.M. and S.C. Hokanson. 2009. Breeding Roses for Disease Resistance. p. 277-324. In: J. Janick (ed.). Plant Breeding Reviews, Vol. 31. John Wiley and Sons, New York.
- Forsline, P.L., H. S. Aldwinckle, E. E. Dickson, J. J. Luby, and S.C. Hokanson. 2003. Collection, Maintenance, Characterization, and Utilization of Wild Apples of Central Asia. p. 1-62. In: J. Janick (ed.). Horticultural Reviews, Volume 29, Wild Apple and Fruit Trees of Central Asia. John Wiley and Sons, New York.
- Hokanson, S.C. and J.L. Maas. 2001. Strawberry biotechnology, p. 139-180. In: J. Janick (ed.). Plant Breeding Reviews, Vol. 21. John Wiley and Sons, New York.
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