ARS | Publication request: Germplasm Release of Tetraploid Clones with Resistance to Cold-induced Sweetening

Submitted to: American Journal of Potato Research
Publication Type: Abstract Only
Publication Acceptance Date: March 19, 2010
Publication Date: February 8, 2011
Citation: Jansky, S.H., Hamernik, A.J., Bethke, P.C. 2011. Germplasm Release of Tetraploid Clones with Resistance to Cold-induced Sweetening. American Journal of Potato Research. 88:218-225.

Technical Abstract: Most of the U.S. potato crop is processed. Storage temperatures of 4-6 °C extend long-term storage capabilities by minimizing losses due to rot, disease, and respiration. At cold storage temperatures, however, tubers accumulate undesirable amounts of reducing sugars and are said to undergo cold-induced sweetening. These tubers produce dark-colored fried products as a result of an interaction between reducing sugars and amino acids in the non-enzymatic Maillard reaction. Breeders are interested in developing chipping cultivars with resistance to cold-induced sweetening. Using germplasm from wild Solanum species for breeding is advantageous in that this material may contain disease resistance or quality trait-related alleles unavailable in S. tuberosum. In a previous study, we described the use of wild Solanum species to develop adapted clones with resistance to cold-induced sweetening. We have introgressed that germplasm into tetraploid breeding clones, and this report describes five adapted tetraploid clones with resistance to cold-induced sweetening that have been grown in the field and evaluated for eight years. M1 is a round white clone with high tuber set and relatively small tubers. M2 is a round russet clone and its full-sib, M3, is a long russet clone. M4 is a round white clone with smooth skin and medium tuber size and set. M5 is a round white clone with buff skin and medium tuber size and set. Specific gravity is very high in all clones. All clones have been selected for male and female fertility. The clones with the highest proportion of wild germplasm (M1, M2, and M3) produce the lightest colored chips after cold storage. The selected clones generally produce acceptable chips at colder storage temperatures than those used by industry.