Caracterização da estrutura genética de populações de Caryocar brasiliense Camb. no estado de Goiás utilizando marcadores moleculares microssatélites
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2005-08-25
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Universidade Federal de Goiás
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The species Caryocar brasiliense Camb. (pequizeiro) is a common tree fruitful
in the Brazilian savannah (Cerrado) with great economic and social potential. The
objective of this study goals the increase of information for an efficient breeding program
for specie domestication and conservation. Eleven natural populations of “pequizeiro”, 30
individuals each, was sampled on five different regions of Goiás state. The genetics
structure of these natural populations was analyzed based on variability at eight
microsatellite loci in about 330 individuals. The number of alleles per locus it varied of 22
to 32 (mean = 28). The waited and observed heterozigosity varied of 0,843 to 0,920 and
0,546 to 0,758, respectively. Measures of genetic differentiation indicated significant
differences between most populations (FST = 0,064 and RST = 0,439). RST values among
samples were high and much higher than FST indicating a divergence between the model
that consider alleles to be identical by descent, and the model of identity by state in these
populations. Estimated number of migrants was high, Nm = 3,63 (mean), and the existence
of private alleles indicated reduced gene flow and a consequently possible damage to the
metapopulations structure. Significant correlation was not found between geographical
distance and measure of genetic divergence, suggesting the intense gene flow in the past
that joined the populations that are separated today.
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Chaves, Sivany Rodrigues - Caracterização da estrutura genética de populações de Caryocar brasiliense Camb. no estado de Goiás utilizando marcadores moleculares microssatélites - 2005 - 67 f. - Dissertação - Programa de Pós-graduação em Agronomia (EAEA) - Universidade Federal de Goiás - Goiânia - Goiás - Brasil.