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Genetic structure and diversity of Copaifera langsdorffii Desf. in Cerrado fragments of the São Paulo State, Brazil

Authors :
Lia Maris Orth Ritter Antiqueira
Renata Gabriela Villegas de Castro e Souza
Miklos Maximiliano Bajay
Paulo Yoshio Kageyama
Source :
Revista Árvore, Vol 38, Iss 4, Pp 667-675 (2014)
Publication Year :
2014
Publisher :
Sociedade de Investigações Florestais, 2014.

Abstract

The loss of large areas of Cerrado (Brazilian savanna) in Brazil can lead to reduced biodiversity and to the extinction of species. Therefore, the present study aimed to investigate the genetic fragility of populations of Copaifera langsdorffii Desf exposed to different anthropic conditions in fragments of Cerrado in the state of São Paulo. The study was carried out in two Experimental Stations operated by the Forest Institute (Assis and Itirapina), in one fully protected conservation unit (Pedregulho) and in one private property (Brotas). Analyses were conducted using leaf samples from 353 adult specimens and eight pairs of microsatellite loci. The number of alleles per locus ranged from 13 to 15 in all populations, but the mean number of effective alleles was approximately half this value (7.2 to 9-1). Observed heterozygosity was significant and lower than the expected in all populations. Consequently, all populations deviated from Hardy-Weinberg expected frequencies. Fixation indexes were significant for all populations, with the Pedregulho population having the lowest value (0.189) and Itirapina having the highest (0.283). The analysis of spatial genetic structure detected family structures at distance classes of 20 to 65 m in the populations studied. No clones were detected in the populations. Estimates of effective population size were low, but the area occupied by each population studied was large enough for conservation, medium and long term. Recent reductions or bottlenecks were detected in all four populations. Mean Gst’ (genetic divergence) indicated that most of the variation was within populations. Cluster structure analysis based on the genotypes detected K= 4 clusters with distinct allele frequencies patterns. The genetic differentiation observed among populations is consistent with the hypothesis of genetic and geographic isolation. Therefore, it is essential to adopt conservation strategies that raise the gene flow between fragments.

Details

Language :
English, Spanish; Castilian, Portuguese
ISSN :
18069088 and 01006762
Volume :
38
Issue :
4
Database :
Directory of Open Access Journals
Journal :
Revista Árvore
Publication Type :
Academic Journal
Accession number :
edsdoj.6c16e28153394c7bba590eecf6cea729
Document Type :
article
Full Text :
https://doi.org/10.1590/S0100-67622014000400010