Population structures of Brazilian tall coconut (Cocos nucifera L.) by microsatellite markers
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Data
2010
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Resumo
Coconut palms of the Tall group were introduced to Brazil from the Cape Verde Islands in 1553. The present study
sought to evaluate the genetic diversity among and within Brazilian Tall coconut populations. Samples were collected
of 195 trees from 10 populations. Genetic diversity was accessed by investigating 13 simple sequence repeats
(SSR) loci. This provided a total of 68 alleles, ranging from 2 to 13 alleles per locus, with an average of 5.23.
The mean values of gene diversity (He) and observed heterozygosity (Ho) were 0.459 and 0.443, respectively. The
genetic differentiation among populations was estimated at
p 0.1600 and the estimated apparent outcrossing rate
was ta = 0.92. Estimates of genetic distances between the populations varied from 0.034 to 0.390. Genetic distance
and the corresponding clustering analysis indicate the formation of two groups. The first consists of the Baía
Formosa, Georgino Avelino, and São José do Mipibu populations and the second consists of the Japoatã, Pacatuba,
and Praia do Forte populations. The correlation matrix between genetic and geographic distances was positive and
significant at a 1% probability. Taken together, our results suggest a spatial structuring of the genetic variability
among the populations. Geographically closer populations exhibited greater similarities.
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Palavras-chave
Coconut, Genetic diversity, Genetic variability, Molecular markers, SSR
Citação
RIBEIRO, Francisco E. et al. Population structures of Brazilian Tall coconut (Cocos nucifera L.) by microsatellite markers. Genetics and Molecular Biology, Ribeirão Preto, v. 33, n. 4, p. 696-702, Sept. 2010.