Abstract
New potato (Solanum tuberosum) varieties are required to contain low levels of the toxic glycoalkaloids and a potential approach to obtain this is through marker-assisted selection (MAS). Before applying MAS it is necessary to map quantitative trait loci (QTLs) for glycoalkaloid content in potato tubers and identify markers that link tightly to this trait. In this study, tubers of a dihaploid BC1 population, originating from a cross between 90-HAF-01 (S. tuberosum 1) and 90-HAG-15 (S. tuberosum 2 × S. sparsipilum), were evaluated for content of α-solanine and α-chaconine (total glycoalkaloid, TGA) after field trials. In addition, tubers were assayed for TGA content after exposure to light. A detailed analysis of segregation patterns indicated that a major QTL is responsible for the TGA content in tubers of this potato population. One highly significant QTL was mapped to chromosome I of the HAG and the HAF parent. Quantitative trait loci for glycoalkaloid production in foliage of different Solanum species have previously been mapped to this chromosome. In the present research, QTLs for α-solanine and α-chaconine content were mapped to the same location as for TGA content. Similar results were observed for tubers exposed to light. The simple sequence repeat marker STM5136 was closely linked to the identified QTL.
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Acknowledgments
This work was funded mainly by The Directorate for Food, Fisheries and Agri Business and partially by The Potato Levy Foundation, Denmark. The authors thank Mrs. Rita Svensson and Mrs. Eva Nordqvist, SW Laboratory, Svalöf Weibull AB, Sweden, for helping us with the glycoalkaloid analyses and Dr. Louise Bach Jensen, Department of Genetics and Biotechnology, University of Aarhus, Denmark, for helping us to carry out MapQTL analyses.
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Communicated by R. Waugh.
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Sørensen, K.K., Kirk, H.G., Olsson, K. et al. A major QTL and an SSR marker associated with glycoalkaloid content in potato tubers from Solanum tuberosum × S. sparsipilum located on chromosome I. Theor Appl Genet 117, 1–9 (2008). https://doi.org/10.1007/s00122-008-0745-z
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DOI: https://doi.org/10.1007/s00122-008-0745-z