Caracterização da estrutura genética de populações de Caryocar brasiliense Camb. no estado de Goiás utilizando marcadores moleculares microssatélites

• Ano de defesa: 2005
• Autor(a) principal: Chaves, Sivany Rodrigues
• Orientador(a): Sibov, Sérgio Tadeu
• Banca de defesa: Sibov, Sérgio Tadeu, Cruz, Aparecido Divino da, Chaves, Lázaro José
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Goiás
• Programa de Pós-Graduação: Programa de Pós-graduação em Agronomia (EAEA)
• Departamento: Escola de Agronomia e Engenharia de Alimentos - EAEA (RG)
• País: Brasil
• Palavras-chave em Português: cerrado; frutíferas; pequi; variabilidade genética; polimorfismo
• Palavras-chave em Inglês: fruitful; genetic variability; polymorphism
• Área do conhecimento CNPq: GENETICA::GENETICA VEGETAL
• Link de acesso: http://repositorio.bc.ufg.br/tede/handle/tde/3022

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.