|Oltmans, S. - N.D. STATE UNIV, FARGO|
Submitted to: American Journal of Potato Research
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: May 18, 2002
Publication Date: July 1, 2002
Citation: Oltmans, S.M., Novy, R.G. 2002. Identification of potato (solanum tuberosum l.) haploid x wild species hybrids with the capacity to cold-chip. American Journal of Potato Research. Volume 79:263-268. Interpretive Summary: Cold sweetening, the accumulation of reducing sugars in potatoes stored at lower temperatures, results in fried potato products with a dark color. These fried potato products are unacceptable to consumers and therefore the potato processing industry. However, storage of potato at colder temperatures (38-40 oF) would be of benefit in that potatoes could be stored for longer periods without the need for the application of sprout inhibitors, there would be less loss of water (shrinkage) from the tubers, and losses to storage diseases would be lessened. This publication reported on the identification of several new species of Solanum (and their respective hybrids with cultivated potato), which have a greater level of resistance to the accumulation of sugars at (38-40 oF) than is currently found in cultivated potato. These species hybrids would be useful to breeders and geneticists in the development of potato cultivars with enhanced cold-sweetening resistance
Technical Abstract: Cold sweetening, the accumulation of reducing sugars in potatoes stored at low temperatures, results in dark chips unacceptable to the consumer. Developing potato cultivars that can chip directly from cooler temperatures (i.e., 3 to 4°C) requires the identification and use of new germplasm with cold-chipping resistance. Individuals from sixteen haploid x wild species hybrid families were grown at two sites and their harvested tubers stored at 3°C for 15 weeks. Following storage, individuals were evaluated for cold-chipping ability by: 1) direct chipping, and 2) reconditioning for two weeks at 18°C prior to chipping. At both sites, approximately 1% of progeny had good chip color (< 2.0 rating using the Snack Food Association scale). Germplasm representing haploid x wild species hybrid families was evaluated for cold-chipping ability following storage of tubers at 3°C for 15 weeks, and after storage at 18°C for 2 weeks. The two cold-chipping clones identified with chip color means < 2.0 were AH 66-1 and H 28-6, hybrids derived from S. raphanifolium accessions 296126 and 310998, respectively. S. raphanifolium PI 296126 was exceptional in that chip color means of its progeny were 2.5 and 2.7 at McLeod and Crookston, respectively. All clones with chip color means < 2.6 involved S. raphanifolium PIs 296126, 310998, and 458384 in their parentage. Following reconditioning, the number of progeny in the good and medium chipping categories improved from direct chipping with 14.1% of the progeny at McLeod and 3.8% at Crookston in the good chipping category. S. raphanifolium PIs 210048 and 310998 together accounted for 100% and 50% of the clones with chip scores < 2.0 at McLeod and Crookston, respectively. Clones ranking high for chip color following direct chipping generally chipped well following reconditioning.