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Title: Germplasm release: Tetraploid clones with resistance to cold-induced sweetening

Author
item Jansky, Shelley
item Hamernik, Andy
item Bethke, Paul

Submitted to: American Journal of Potato Research
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 12/29/2010
Publication Date: 2/8/2011
Citation: Jansky, S.H., Hamernik, A.J., Bethke, P.C. 2011. Germplasm release: Tetraploid clones with resistance to cold-induced sweetening. American Journal of Potato Research. 88:218-225.

Interpretive Summary: Long-term cold storage is necessary to supply potatoes and potato products throughout the year. Storage at cold temperatures, however, results in an accumulation of sugars that cause dark-colored chips. This phenomenon is called cold-induced sweetening and it limits the potential for existing potato varieties to produce acceptable chips after cold storage. Genes for resistance to cold-induced sweetening have been crossed into potato from wild potato relatives. Five individuals resulting from such crosses are described in this paper. These individuals can be used in potato breeding programs to improve chip quality in cold-stored tubers. Each is male and female fertile, and all produce tubers under the conditions found in the major potato producing regions of the US. They produce acceptable chip color following storage at 2.8-7.2C for three to six months. In addition, their starch content is high, which is desirable for chip production.

Technical Abstract: Long-term cold storage is necessary to supply potatoes to the processing industry and potato products to consumers throughout the year. Cold-induced sweetening limits the potential for existing potato cultivars to produce acceptable chips after cold storage. Genes for resistance to cold-induced sweetening have been introgressed into the cultivated potato (Solanum tuberosum) from wild Solanum relatives of potato. This paper describes five tetraploid, interspecific, hybrid clones that can be used in breeding programs to improve chip quality in cold-stored tubers. The clones are male and female fertile and are adapted to temperate zone production environments. Each produces chips with acceptable color following storage at 2.8-7.2C for three to six months. In addition, specific gravity in all clones is high. Following cold storage, the five clones vary in sucrose content, but glucose and fructose levels are low compared to standard cultivars.