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- aggregation classification "A1".
- aggregation creator B238140.
- aggregation creator B238141.
- aggregation creator B238142.
- aggregation creator B238143.
- aggregation creator B238144.
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- aggregation creator B238146.
- aggregation creator person.
- aggregation date "2009".
- aggregation format "application/pdf".
- aggregation hasFormat 1982070.bibtex.
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- aggregation isPartOf urn:issn:1614-2942.
- aggregation language "eng".
- aggregation rights "I have transferred the copyright for this publication to the publisher".
- aggregation subject "Biology and Life Sciences".
- aggregation title "Genetic diversity assessment of sub-samples of cacao, Theobroma cacao L., collections in West Africa using simple sequence repeat markers".
- aggregation abstract "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 (H (nb) = 0.730), followed by the 1944 Posnette's Introduction (H (nb) = 0.704), and was lowest in the Local parent population (H (nb) = 0.471). Gene diversity was appreciably high in the farmers' populations (H (nb) = 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 (F (is) = 0.209 and 0.160, respectively), and excess of heterozygotes in the Trinitario parent population (F (is) = -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.".
- aggregation authorList BK508944.
- aggregation endPage "711".
- aggregation issue "4".
- aggregation startPage "699".
- aggregation volume "5".
- aggregation aggregates 1985995.
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- aggregation similarTo s11295-009-0221-1.
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