Estrutura genética molecular de uma coleção de Germoplasma in vivo e ex situ de Dipteryx alata Vog.

• Autor(a) principal: Guimarães, Rejane Araújo
• Data de Publicação: 2014
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da UFG
• dARK ID: ark:/38995/001300000dg1g
• Texto Completo: http://repositorio.bc.ufg.br/tede/handle/tede/4286
• topic: Baru; Cerrado; Diversidade genética; Microssatélites; Recursos genéticos; Genetics; Microsatellite diversity; Genetic resources; BIOQUIMICA::BIOLOGIA MOLECULAR

The distribution patterns of genetic variability within and among subpopulations are important to know the performance of evolutionary processes, to adopt effective conservation strategies and to use genetic plant resources. The population genetic structure is focused on how the genetic variability is distributed within and between subpopulations. Microsatellite markers are especially useful for such analyzes because are highly informative. The Baru (Dipteryx alata Vogel), belongs to the Fabaceae family and is widely distributed in the Cerrado biome, also has a great potential for use in local cooking, as ornamental plant and in popular medicine, so being an important genetic resource plant. This study aimed to evaluate the genetic structure among subpopulations of D. alata which constitute a germplasm collection, maintained by the Escola de Agronomia, of the Universidade Federal de Goiás. The collection consists of 600 individuals from 150 progenies of 25 subpopulations from different regions of Cerrado biome. Nine pairs of primers were used, eight developed for the species D. alata and one developed and transferred from Phaseolus vulgaris for molecular analysis. The number of alleles ranged from 2 to 14 alleles, with an average of 5.5 allele per locus. The average of observed heterozygosity was equal to 0.340 and ranged from 0.102 (DaE06) to 0.711 (DaE41). The expected heterozygosity, under the condition of Hardy-Weinberg equilibrium was equal to 0.383, ranging from 0.162 (DaE06) and 0.809 (DaE41). The analysis of population genetic structure showed a level of medium relatedness between individuals of the same progeny (θs) of 0.169, which is equivalent to that kinship expected for a mixture of half-sibs and full sibs. From the value θs, it can be concluded that there is a high genetic differentiation between the progenies. When evaluated the subpopulations was found an estimated θp equal to 0.097, suggesting that there is a moderate genetic structure. The value of overall intrapopulation fixation index (f=0.122) indicated the presence of low inbreeding in subpopulations that composes the collection of germplasm. The estimated apparent outcrossing rate (ta) value was equal to 0.78. The overall F value was significant and equal to 0.27. The analysis of population genetic structure revealed the presence of genetic structure among subpopulations and among progenies within of the subpopulations. This reveals that the germplasm collection of D. alata presents genetic diversity within and among populations, indicating that the conservation strategies should consider both levels.