Skip to content
Home
About Us
Resources
Profiles Metrics
Authors Directory
Institutions Directory
Top Authors
Top Institutions
Top Sponsors
AI Digest
Contact Us
Menu
Home
About Us
Resources
Profiles Metrics
Authors Directory
Institutions Directory
Top Authors
Top Institutions
Top Sponsors
AI Digest
Contact Us
Home
About Us
Resources
Profiles Metrics
Authors Directory
Institutions Directory
Top Authors
Top Institutions
Top Sponsors
AI Digest
Contact Us
Menu
Home
About Us
Resources
Profiles Metrics
Authors Directory
Institutions Directory
Top Authors
Top Institutions
Top Sponsors
AI Digest
Contact Us
Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
Genetic diversity assessment of sub-samples of cacao, Theobroma cacao L. collections in West Africa using simple sequence repeats marker
Tree Genetics and Genomes, Volume 5, No. 4, Year 2009
Notification
URL copied to clipboard!
Description
Knowledge of genebank and on-farm genetic diversity, particularly in an introduced crop species, is crucial to the management and utilization of the genetic resources available. Microsatellite markers were used to determine genetic diversity in 574 accessions of cacao, Theobroma cacao L., representing eight groups covering parental populations in West Africa, genebank, and farmers' populations in Nigeria. From the 12 microsatellite markers used, a total of 144 alleles were detected with a mean allelic richness of 4.39 alleles/locus. The largest genetic diversity was found in the Upper Amazon parent population (Hnb=0.730), followed by the 1944 Posnette's Introduction (Hnb=0.704), and was lowest in the Local parent population (Hnb=0.471). Gene diversity was appreciably high in the farmers' populations (Hnb=0.563-0.624); however, the effective number of alleles was lower than that found in the genebank's Posnette's population. Fixation index estimates indicated deficiency of heterozygotes in the Upper Amazon and the Local parent populations (Fis=0.209 and 0.160, respectively), and excess of heterozygotes in the Trinitario parent population (Fis=-0.341). The presence of inbreeding in the Local parent populations and substructure (Wahlund effect) in the Upper Amazon were suggested for the deficiency of heterozygotes observed. Non-significant genetic differentiation observed between the genebank's and farmers' populations indicated significant impact of national breeding programs on varieties grown in farmers' plantations. From this study, we showed that appreciable genetic diversity was present in on-farm and field genebank collections of cacao that can be exploited for crop improvement in West Africa. Suggestions for future conservation of on-farm genetic diversity and local landraces are further discussed. © Springer-Verlag 2009.
Authors & Co-Authors
Aikpokpodion, Peter O.
Nigeria, Ibadan
Cocoa Research Institute of Nigeria
Nigeria, Ibadan
International Institute of Tropical Agriculture
Motamayor, Juan Carlos
United States, Washington, D.c.
Usda Agricultural Research Service
Adetimirin, Victor Olawale
Nigeria, Ibadan
University of Ibadan
Adu-Ampomah, Yaw
Ghana, New Tafo
Cocoa Research Institute of Ghana
Ingelbrecht, Ivan L.
Nigeria, Ibadan
International Institute of Tropical Agriculture
Eskes, Albertus
Italy, Rome
Bioversity International
Schnell, Ray
United States, Washington, D.c.
Usda Agricultural Research Service
Kolesnikova-Allen, Maria A.
Nigeria, Ibadan
International Institute of Tropical Agriculture
Statistics
Citations: 37
Authors: 8
Affiliations: 6
Identifiers
Doi:
10.1007/s11295-009-0221-1
ISSN:
16142942
Research Areas
Genetics And Genomics
Study Design
Cross Sectional Study
Study Locations
Multi-countries
Nigeria