Produção Nacional
Revisado por pares
Population structures of Brazilian Tall coconut (Cocos nucifera L.) by microsatellite markers
2010; Brazilian Society of Genetics; Volume: 33; Issue: 4 Linguagem: Inglês
10.1590/s1415-47572010005000077
ISSN1678-4685
AutoresF. E. Ribeiro, Luc Baudouin, Patricia Lebrun, Lázaro José Chaves, Cláudio Brondani, Maria Imaculada Zucchi, Roland Vencovsky,
Tópico(s)Identification and Quantification in Food
ResumoCoconut 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 (H(e) ) and observed heterozygosity (H(o) ) were 0.459 and 0.443, respectively. The genetic differentiation among populations was estimated at θ^P=0.1600and the estimated apparent outcrossing rate was t(a) = 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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