Adding value to cocoa (Theobroma cacao L.) germplasm information with domestication history and admixture mapping.
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.
Marcano
Maria
M
Centre de Coopération Internationale en Recherche Agronomique pour le Développement, (CIRAD) TA 40/03, 34398, Montpellier Cedex 5, France. marseg@ula.ve
Pugh
Tatiana
T
Cros
Emile
E
Morales
Sonia
S
Portillo Páez
Elvis A
EA
Courtois
Brigitte
B
Glaszmann
Jean Christophe
JC
Engels
Jan M M
JM
Phillips
Wilbert
W
Astorga
Carlos
C
Risterucci
Ange Marie
AM
Fouet
Olivier
O
González
Ventura
V
Rosenberg
Kai
K
Vallat
Isabelle
I
Dagert
Manuel
M
Lanaud
Claire
C
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