|Chen, Yu-Kuang - UNIVERSITY OF WISCONSIN|
|Palta, Jiwan - UNIVERSITY OF WISCONSIN|
Submitted to: American Journal of Potato Research
Publication Type: Abstract Only
Publication Acceptance Date: May 16, 1996
Publication Date: N/A
Technical Abstract: Wild potato germplasm provides a valuable source of genetic variability in breeding for frost resistance. In order to explore the genetic control of freezing tolerance in potatoes, the expression of this character was evaluated in the interspecific F1 between hardy and nonhardy species. After a frost in late September 1995, field plots were scored by visual inspection of damage. According to the ratings obtained, the crosses with higher ploidy in the hardy parents tended to have resistance better than mid-parent values or approximate to the scores of hardy parents. Otherwise, the resistance in F1 produced by parents with the same ploidy were less than or close to the parental means. Some of the cross combinations with parents were also studied under controlled environment at the Biotron by separately characterizing the two independent genetic components of freezing tolerance, nonacclimated freezing tolerance (NA) and acclimation capacity (ACC). Both NA and ACC showed a similar tendency to what has been observed in the field. Results from this work suggest that both the genomic ratio of hardy to nonhardy parents in the hybrids, and probably the dominance of homoeoallelic genes in sensitive species could have significant effect on determining the expression of freezing tolerance.