A major QTL and an SSR marker associated with glycoalkaloid content in potato tubers from Solanum tuberosum x S. sparsipilum located on chromosome I.
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 BC(1) population, originating from a cross between 90-HAF-01 (S. tuberosum(1)) and 90-HAG-15 (S. tuberosum(2) x S. sparsipilum), were evaluated for content of alpha-solanine and alpha-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 alpha-solanine and alpha-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.
Sørensen
Kirsten Kørup
KK
Department of Agroecology and Environment, Faculty of Agricultural Sciences, University of Aarhus, PO Box 50, 8830 Tjele, Denmark. KirstenK.Sorensen@agrsci.dk
Kirk
Hanne Grethe
HG
Olsson
Kerstin
K
Labouriau
Rodrigo
R
Christiansen
Jørgen
J
D054458:Amplified Fragment Length Polymorphism Analysis; D001947:Breeding; D002851:Chromatography, High Pressure Liquid; D002874:Chromosome Mapping; D032461:Chromosomes, Plant / Q000235:genetics; D018744:DNA, Plant / Q000235:genetics*; D004171:Diploidy; D008040:Genetic Linkage; D005819:Genetic Markers; D008027:Light; D010641:Phenotype; D035281:Plant Tubers / Q000737:chemistry*; D016133:Polymerase Chain Reaction; D025341:Principal Component Analysis; D040641:Quantitative Trait Loci; D012091:Repetitive Sequences, Nucleic Acid; D012992:Solanine / Q000031:analogs & derivatives* / Q000032:analysis; D011198:Solanum tuberosum / Q000737:chemistry / Q000235:genetics*
D018744:DNA, Plant; D005819:Genetic Markers; C514919:alpha-solanine; D012992:Solanine; C011860:alpha-chaconine