title: Adding value to cocoa (Theobroma cacao L.) germplasm information with domestication history and admixture mapping.
abstract: A sound understanding of crop history can provide the basis for deriving novel genetic information through admixture mapping. We confirmed this, by using characterization data from an international collection of cocoa, collected 25 years ago, and from a contemporary plantation. We focus on the trees derived from three centuries of admixture between Meso-American Criollo and South American Forastero genomes. In both cacao sets of individuals, linkage disequilibrium extended over long genetic distances along chromosome regions, as expected in populations derived from recent admixture. Based on loose genome scans, genomic regions involved in useful traits were identified. Fifteen genomic regions involved in seed and fruit weight variation were highlighted. They correspond to ten previously identified QTLs and five novel ones. Admixture mapping can help to add value to genetic resources and thus, help to encourage investment in their conservation.
authors.affiliation: Centre de Coopération Internationale en Recherche Agronomique pour le Développement, (CIRAD) TA 40/03, 34398, Montpellier Cedex 5, France. marseg@ula.ve
authors.forename: Maria
authors.initials: M
authors.lastname: Marcano
authors.forename: Tatiana
authors.initials: T
authors.lastname: Pugh
authors.forename: Emile
authors.initials: E
authors.lastname: Cros
authors.forename: Sonia
authors.initials: S
authors.lastname: Morales
authors.forename: Elvis A
authors.initials: EA
authors.lastname: Portillo Páez
authors.forename: Brigitte
authors.initials: B
authors.lastname: Courtois
authors.forename: Jean Christophe
authors.initials: JC
authors.lastname: Glaszmann
authors.forename: Jan M M
authors.initials: JM
authors.lastname: Engels
authors.forename: Wilbert
authors.initials: W
authors.lastname: Phillips
authors.forename: Carlos
authors.initials: C
authors.lastname: Astorga
authors.forename: Ange Marie
authors.initials: AM
authors.lastname: Risterucci
authors.forename: Olivier
authors.initials: O
authors.lastname: Fouet
authors.forename: Ventura
authors.initials: V
authors.lastname: González
authors.forename: Kai
authors.initials: K
authors.lastname: Rosenberg
authors.forename: Isabelle
authors.initials: I
authors.lastname: Vallat
authors.forename: Manuel
authors.initials: M
authors.lastname: Dagert
authors.forename: Claire
authors.initials: C
authors.lastname: Lanaud
mesh_terms: D001947:Breeding; D002099:Cacao / Q000033:anatomy & histology / Q000145:classification / Q000235:genetics*; D032461:Chromosomes, Plant / Q000235:genetics; D014644:Genetic Variation; D018745:Genome, Plant; D006239:Haplotypes; D015810:Linkage Disequilibrium; D010641:Phenotype; D040641:Quantitative Trait Loci