Location: Vegetable Crops ResearchTitle: Quantitative trait loci for resistance to common scab and cold-induced sweetening in diploid potato Author
Submitted to: The Plant Genome
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 4/10/2017
Publication Date: 8/10/2017
Citation: Braun, S.R., Endelman, J.B., Haynes, K.G., Jansky, S.H. 2017. Quantitative trait loci for resistance to common scab and cold-induced sweetening in diploid potato . The Plant Genome. https://doi.org/10.3835/plantgenome2016.10.0110. Interpretive Summary: The development of germplasm with resistance to common scab and cold-induced sweetening is a high priority for the potato industry. Common scab results in skin blemishes, while cold-induced sweetening leads to dark fry products. In this study, we evaluated a population that segregates for those two traits and identified genetic regions associated with resistance to common scab and cold-induced sweetening. This will aid in the development of molecular markers to allow breeders to select desirable clones.
Technical Abstract: The development of germplasm with resistance to common scab and cold-induced sweetening is a high priority for the potato industry. A mapping population was developed from mating two individuals from a diploid family generated by crossing the susceptible cultivated potato (Solanum tuberosum) clone US-W4 to the highly resistant wild relative (S. chacoense) clone 524-8. Progeny were evaluated in replicated field trials. Tubers were scored for percent surface area with scab lesions, scab lesion type, cold-induced sweetening, average tuber weight, and dry matter. Plants were evaluated for vine maturity. A genetic map was constructed, quantitative trait loci (QTL) were identified, and gene action of significant QTL was characterized using 1606 single nucleotide polymorphisms (SNPs). A significant QTL for common scab percent surface area covered with lesions and lesion type was identified on chromosome 11. QTL were identified on chromosomes 4 and 6 for cold-induced sweetening, chromosome 5 for maturity, and chromosome 1 for average tuber weight. Identification of QTL is the first step toward developing molecular markers for breeders to efficiently integrate these desirable traits into cultivars.