Genetic diversity and natural population structure of cacao (Theobroma cacao L.) from the Brazilian Amazon evaluated by microsatellite markers

Simple item page
dc.contributor.authorMaria L. Sereno
dc.contributor.authorPaulo S.B. Albuquerque
dc.contributor.authorRoland Vencovsky
dc.contributor.authorAntonio Figueira
dc.date.accessioned2014-04-09T09:37:02Z
dc.date.available2014-04-09T09:37:02Z
dc.date.issued2006
dc.description.abstractA sample of 94 accessions of Theobroma cacao L. (cacao), representing four populations from the Brazilian Amazon (Acre, Rondoˆ nia, lower Amazon and upper Amazon) were analyzed using microsatellite markers to assess the genetic diversity and the natural population structure. From the 19 microsatellite loci tested, 11 amplified scorable products, revealing a total of 49 alleles, including two monomorphic loci. The Brazilian upper Amazon population contained the largest genetic diversity, with the most polymorphic loci, the highest observed heterozygosity; and the majority of rare alleles, thereby this region might be considered part of the center of diversity of the species. The observed heterozygosity for all the Brazilian populations (Ho=0.347) was comparable with values reported for other similar upper Amazon Forastero cacao populations, with the Acre and Rondoˆ nia displaying the lowest values. The lower Amazon population, traditionally defined as highly homozygous, presented an unexpectedly high observed heterozygosity (Ho=0.372), disclosing rare and distinct alleles, with large identity with the upper Amazon population. It was hypothesized that part of the lower Amazon population might derive from successive natural or intentional introduction of planting material from other provenances, mainly upper Amazon. Most of the loci exhibited a lower observed heterozygosity than expected, suggesting that self-pollination might be more common than usually assumed in cacao, but excess of homozygotes might also derive from sub-grouping (Wahlund effect) or from sampling related individuals. Most of the gene diversity was found to occur within groups, with small differentiation between the four Brazilian Amazon populations, typical of species with high gene flow.en_US
dc.identifier.citationConservation Genetics (2006) 7:13–24en_US
dc.identifier.urihttp://hdl.handle.net/123456789/325
dc.language.isoenen_US
dc.publisherSpringeren_US
dc.subjectcenter of diversityen_US
dc.subjectcocoaen_US
dc.subjectgermplasmen_US
dc.subjectsimple sequence repeatsen_US
dc.titleGenetic diversity and natural population structure of cacao (Theobroma cacao L.) from the Brazilian Amazon evaluated by microsatellite markersen_US
dc.typeArticleen_US

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
Genetic Diversity and Natural Population Structure of cacao(theobroma cacao L.) From the Brazilian Amazon Evaluated by Microsatellite Markers.pdf
Size:
312.73 KB
Format:
Adobe Portable Document Format
Download
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.71 KB
Format:
Item-specific license agreed upon to submission
Description:
Download

Collections

Cocoa