Herdabilidade em caracteres de crescimento de populações fragmentadas da espécie arbórea copaifera langsdorffii (fabaceae)

• Ano de defesa: 2014
• Autor(a) principal: Kubota, Thaisa Yuriko Kuboyama [UNESP]
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Estadual Paulista (Unesp)
• Palavras-chave em Português: Copaíba; Genetica florestal; Melhoramento genetico
• Link de acesso: http://hdl.handle.net/11449/110295

The knowledge about the evolutionary potential of natural populations is critical to ensure the survival of the species. Heritability estimates are necessary to analyze how much of the phenotypic variation of traits are about genetic control. The aim of this study is to investigate the genetic control of growth traits in the initial phases of developing fragmented populations Copaifera langsdorffii, using microsatellite markers. Therefore, two populations of C. langsdorffii were used a municipal park located in São José do Rio Preto (SJRP) and at Assis Ecological Station (AES), both in the state of São Paulo, Brazil. The model to estimate the heritability coefficient is the method of regression of a measure of phenotypic similarity and an estimate of kinship between individuals, run the Mark programs. The coefficients of relatedness and heritability were estimated for three classes of distance (10, 20 and 30 m) within populations. Estimates of heritability were low (maximum 0.146) for all traits, ranging from positive values for regenerating individuals of the population SJRP and from negative to positive for the juvenile population AES. In evolutionary terms, these results indicate little chance of changing the population mean of the characters studied by natural selection, with the strongest environmental random effects to change this average. This result, coupled with the trend of reduction in the coefficient of heritability for height between regenerating juveniles individuals indicates also that the genetic control reduces the development of plants, in other words, natural selection in natural populations is stronger in the early stages of plant development. In short, the results suggest that there are no differences in the levels of heritability between the two populations and that the heritability for growth traits is low in both populations