Theoretical and Applied Genetics

, Volume 108, Issue 6, pp 1151–1161

A new cacao linkage map based on codominant markers: development and integration of 201 new microsatellite markers

  • T. Pugh
  • O. Fouet
  • A. M. Risterucci
  • P. Brottier
  • M. Abouladze
  • C. Deletrez
  • B. Courtois
  • D. Clement
  • P. Larmande
  • J. A. K. N’Goran
  • C. Lanaud
Original Paper

DOI: 10.1007/s00122-003-1533-4

Cite this article as:
Pugh, T., Fouet, O., Risterucci, A.M. et al. Theor Appl Genet (2004) 108: 1151. doi:10.1007/s00122-003-1533-4

Abstract

A linkage map of cacao based on codominant markers has been constructed by integrating 201 new simple sequence repeats (SSR) developed in this study with a number of isoenzymes, restriction fragment length polymorphisms (RFLP), microsatellite markers and resistance and defence gene analogs (Rgenes-RFLP) previously mapped in cacao. A genomic library enriched for (GA)n and (CA)n was constructed, and 201 new microsatellite loci were mapped on 135 individuals from the same mapping population used to establish the first reference maps. This progeny resulted from a cross between two heterozygous cacao clones: an Upper-Amazon Forastero (UPA 402) and a Trinitario (UF 676). The new map contains 465 markers (268 SSRs, 176 RFLPs, five isoenzymes and 16 Rgenes-RFLP) arranged in ten linkage groups corresponding to the haploid chromosome number of cacao. Its length is 782.8 cM, with an average interval distance between markers of 1.7 cM. The new microsatellite markers were distributed throughout all linkage groups of the map, but their distribution was not random. The length of the map established with only SSRs was 769.6 cM, representing 94.8% of the total map. The current level of genome coverage is approximately one microsatellite every 3 cM. This new reference map provides a set of useful markers that is transferable across different mapping populations and will allow the identification and comparison of the most important regions involved in the variation of the traits of interest and the development of marker-assisted selection strategies.

Copyright information

© Springer-Verlag 2004

Authors and Affiliations

  • T. Pugh
    • 1
    • 2
  • O. Fouet
    • 1
  • A. M. Risterucci
    • 1
  • P. Brottier
    • 3
  • M. Abouladze
    • 1
  • C. Deletrez
    • 1
  • B. Courtois
    • 1
  • D. Clement
    • 1
  • P. Larmande
    • 1
  • J. A. K. N’Goran
    • 4
  • C. Lanaud
    • 1
  1. 1.UMR 1096, CIRAD-BIOTROPMontpellier Cedex 5France
  2. 2.UCV-FAGROMaracayVenezuela
  3. 3.GENOSCOPECentre National de SéquençageEvryFrance
  4. 4.CNRACentre National de Recherches AgronomiquesAbidjanIvory Coast