Estrutura genética e fenóis totais de populações naturais de barbatimão (Stryphnodendron adstringens) / Genetic structure and total phenols of the natural populations of barbatimão (Stryphnodendron adstringens)

AUTOR(ES)

Jacqueline Siqueira Glasenapp

DATA DE PUBLICAÇÃO

2007

RESUMO

Four natural populations of the Struphnodendron adstringens in the cerrado strictu sensu, North region of Minas Gerais State were studied, three from the Grão Mogol district and one from the Montes Claros district. Through the analyzes of 5 isoenzimatic polimorphic locos, estimates of the allelic frequencies of 276 adult individuals were obtained. Based on the heterozygotes observed and expected the F Wright (1951) statistics were estimated. An excess of heterozygotes inside (Fis = - 0.3866) and in the populations group (Frr = - 0.3065), and the low genetic diversion among the populations (Fst = 0,0578) were verified. According to the genetic differentiation method Gst of Nei (1973), about 94% of the genetic variability is enclosed among the populations, and about 6% are attributed to the differences among the populations. Estimates of effective size (Ne) were superior to the number of individuals shown in the samples obtained. In spite of the apparent distinction observed through the grouping technique UPGMA between the Grão Mogol and Montes Claros populations, based on the results of the Weir Heterozygotes Analyzes (1996), there are no significant genetic divergences between the populations. The genetic flux (Nm) values obtained were extremely high indicating the low genetic divergence between the populations, and the fact that the greater part of the variety is contained within them. Furthermore, the total phenol values were quantified, and averages of 18,58% in the bark, 14,27% in the fruit and 9,35% in the leaves were verified. In an overall way, the barks are more recommended for the raw matter obtaining, and it is believed that the strategies aiming at the conservation of the genetic diversity of S. adstringens imply in maintenance of the population with a great number of individuals.

ASSUNTO(S)

análise isoenzimática stryphnodendron adstringens melhoramento vegetal stryphnodendron adstringens isoenzimatic analisy medical plants plantas medicinais

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