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Molecular Breeding

, 37:15 | Cite as

QTL mapping of potato chip color and tuber traits within an autotetraploid family

  • Kyle Rak
  • Paul C. Bethke
  • Jiwan P. PaltaEmail author
Article

Abstract

Cultivated potato (Solanum tuberosum L.) is a highly heterozygous autotetraploid crop species, and this creates challenges for traditional line development and molecular breeding. Recent availability of a single-nucleotide polymorphism (SNP) array with 8303 features and software packages for linkage and association mapping in autotetraploid species present new opportunities for the identification of genomic regions that contribute to high-value traits in cultivated potato. A biparental tetraploid potato population was evaluated across three field seasons and storage trials in order to identify quantitative trait loci (QTL) for multiple tuber traits including fried chip color after 5.5–7.2 °C storage. Tetra-allelic dosage information was used to construct a genetic linkage map that covered 1041 cM and contained 2095 SNP markers with a median marker interval of 0.4 cM. A total of 41 QTL were identified for flower color, tuber yield, tuber number per plant, tuber weight, tuber size, and chip color after various storage regimes. Moderate effect QTL for chip color at 3 months were identified that co-localized with candidate genes vacuolar invertase (VInv), invertase inhibitor (INH2), and apoplastic invertase (Inv ap -b). A separate QTL for chip color after 6 months of storage was identified in the short arm of chromosome 2, and this locus may contribute to variation in senescent sweetening resistance. QTL for tuber weight, length, and width co-localized with a known QTL for plant maturity on chromosome 5. Genome-wide association mapping using a polyploid model detected the tuber size QTL and identified a number of candidate SNPs, but was unable to detect markers significantly associated with chip color.

Keywords

Solanum tuberosum QTL mapping GWAS SNP genotyping Potato cold storage Polyploid genetics 

Supplementary material

11032_2017_619_MOESM1_ESM.docx (1.2 mb)
ESM 1 (DOCX 1.15 mb)

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Copyright information

© Springer Science+Business Media Dordrecht 2017

Authors and Affiliations

  1. 1.Department of HorticultureUniversity of Wisconsin-MadisonMadisonUSA
  2. 2.USDA Agricultural Research Service, Vegetable Crops Research UnitMadisonUSA

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