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Molecular Breeding

, Volume 29, Issue 2, pp 457–466 | Cite as

Genetic mapping of quantitative trait loci controlling fruit size and shape in papaya

  • Andrea L. Blas
  • Qingyi Yu
  • Olivia J. Veatch
  • Robert E. Paull
  • Paul H. Moore
  • Ray MingEmail author
Article

Abstract

Papaya (Carica papaya L.) is a pan-tropical tree that bears fruit exhibiting a wide range of size and shape. Depending on variety and environment, papaya fruit may weigh from 0.2 kg up to 10 kg. Papaya fruit shape is a sex-linked trait ranging from spherical to ovate, cylindrical or pyriform. An F2 mapping population, produced from a cross between the Thai variety Khaek Dum, bearing 1.2 kg, red-fleshed fruit, and variety 2H94, a Hawaii Solo type bearing a 0.2 kg, yellow-fleshed fruit, was used to identify quantitative trait loci (QTLs) that influence papaya fruit characters including weight, diameter, length and shape. Fruit phenotype data, collected from two subpopulations planted in successive growing seasons, showed striking differences by year indicating significant genotype × environment interactions. Fourteen QTL with phenotypic effects ranging from 5 to 23% were identified across six linkage groups (LGs) with clusters of two or more QTL on LGs 02, 03, 07 and 09. These loci contain homologs to the tomato fruit QTL ovate, sun and fw2.2 regulating fruit size and shape. The papaya fruit QTL provide a starting point for dissecting the genetic pathways leading to extreme fruit size and shape and may prove useful for papaya breeders attempting to tailor new varieties to specific consumer markets.

Keywords

Carica papaya Fruit size Fruit shape Quantitative trait loci 

Notes

Acknowledgments

We thank the HARC Kunia Substation Field Crew for their aid in set-up and maintenance of the mapping populations. Special thanks are also given for the assistance and technical support provided by Anne-Florence Lava and Gail Uru. Funding for this project was provided by the Hawaii Agriculture Research Center and a grant from the USDA Tropical Subtropical Agricultural Research program via the University of Hawaii.

Supplementary material

11032_2011_9562_MOESM1_ESM.doc (442 kb)
Supplementary material 1 (DOC 442 kb)

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Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • Andrea L. Blas
    • 1
    • 2
    • 6
  • Qingyi Yu
    • 2
    • 3
  • Olivia J. Veatch
    • 1
    • 2
    • 7
  • Robert E. Paull
    • 4
  • Paul H. Moore
    • 2
  • Ray Ming
    • 2
    • 5
    Email author
  1. 1.Department of Molecular Biosciences and BioengineeringUniversity of HawaiiHonoluluUSA
  2. 2.Hawaii Agriculture Research CenterKuniaUSA
  3. 3.Texas AgriLife ResearchTexas A & M UniversityWeslacoUSA
  4. 4.Department of Tropical Plant and Soil SciencesUniversity of HawaiiHonoluluUSA
  5. 5.Department of Plant BiologyUniversity of Illinois at Urbana-ChampaignUrbanaUSA
  6. 6.Centre de Recerca AgrigenòmicaIRTACabrilsSpain
  7. 7.Center for Human Genetics ResearchVanderbilt UniversityNashvilleUSA

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