Theoretical and Applied Genetics

, Volume 125, Issue 8, pp 1603–1618

Comparative mapping in watermelon [Citrullus lanatus (Thunb.) Matsum. et Nakai]

  • Katherine Sandlin
  • Jason Prothro
  • Adam Heesacker
  • Nelly Khalilian
  • Rebecca Okashah
  • Wenwen Xiang
  • Eleni Bachlava
  • David G. Caldwell
  • Chris A. Taylor
  • Danelle K. Seymour
  • Victoria White
  • Eva Chan
  • Greg Tolla
  • Cathy White
  • Dolores Safran
  • Elaine Graham
  • Steven Knapp
  • Cecilia McGregor
Original Paper

Abstract

The first single-nucleotide polymorphism (SNP) maps for watermelon [Citrullus lanatus (Thunb.) Matsum. et Nakai] were constructed and compared. Three populations were developed from crosses between two elite cultivars, Klondike Black Seeded × New Hampshire Midget (KBS × NHM), an elite cultivar and wild egusi accession, Strain II × PI 560023 (SII × Egusi) and an elite cultivar and a wild citron accession, ZWRM50 × PI 244019 (ZWRM × Citroides). The SII × Egusi and ZWRM × Citroides F2 populations consisted of 187 and 182 individuals respectively while the KBS × NHM recombinant inbred line (RIL) population consisted of 164 lines. The length of the genetic maps were 1,438, 1,514 and 1,144 cM with average marker distances of 3.8, 4.2, and 3.4 cM for the KBS × NHM, SII × Egusi and ZWRM × Citroides populations, respectively. Shared markers were used to align the three maps so that the linkage groups (LGs) represented the 11 chromosomes of the species. Marker segregation distortion were observed in all three populations, but was highest (12.7  %) in the ZWRM × Citroides population, where Citroides alleles were favored. The three maps were used to construct a consensus map containing 378 SNP markers with an average distance of 5.1 cM between markers. Phenotypic data was collected for fruit weight (FWT), fruit length (FL), fruit width (FWD), fruit shape index (FSI), rind thickness (RTH) and Brix (BRX) and analyzed for quantitative trait loci (QTL) associated with these traits. A total of 40 QTL were identified in the three populations, including major QTL for fruit size and shape that were stable across genetic backgrounds and environments. The present study reports the first SNP maps for Citrullus and the first map constructed using two elite parents. We also report the first stable QTL associated with fruit size and shape in Citrullus lanatus. These maps, QTL and SNPs should be useful for the watermelon community and represent a significant step towards the potential use of molecular tools in watermelon breeding.

Supplementary material

122_2012_1938_MOESM1_ESM.xlsx (33 kb)
Supplementary material 1 (XLSX 33 kb)
122_2012_1938_MOESM2_ESM.docx (862 kb)
Supplementary material 2 (DOCX 861 kb)

Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  • Katherine Sandlin
    • 1
  • Jason Prothro
    • 1
  • Adam Heesacker
    • 1
    • 5
  • Nelly Khalilian
    • 1
  • Rebecca Okashah
    • 1
  • Wenwen Xiang
    • 2
  • Eleni Bachlava
    • 2
  • David G. Caldwell
    • 3
  • Chris A. Taylor
    • 1
    • 3
  • Danelle K. Seymour
    • 2
    • 4
  • Victoria White
    • 2
  • Eva Chan
    • 2
  • Greg Tolla
    • 2
  • Cathy White
    • 2
  • Dolores Safran
    • 2
  • Elaine Graham
    • 2
  • Steven Knapp
    • 1
    • 2
  • Cecilia McGregor
    • 6
  1. 1.Institute of Plant Breeding, Genetics and GenomicsUniversity of GeorgiaAthensUSA
  2. 2.MonsantoWoodlandUSA
  3. 3.MonsantoChesterfieldUSA
  4. 4.Department of Molecular BiologyMax Planck Institute for Developmental BiologyTübingenGermany
  5. 5.Crop and Soil Science DepartmentOregon State UniversityCorvallisUSA
  6. 6.Department of Horticulture and Institute of Plant Breeding, Genetics and GenomicsUniversity of GeorgiaAthensUSA

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