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      Descrição da diversidade genética de populações naturais de barbatimão stryphnodendron adstringens (mart.) coville em unidades de conservação de Minas Gerais Translated title: Description of genetic diversity of natural populations of barbatimão stryphnodendron adstringens (mart.) coville in conservation areas from Minas Gerais

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          Abstract

          O objetivo deste estudo foi descrever a diversidade genética de S. adstringens em três populações localizadas em Unidades de Conservação do Estado de Minas Gerais, utilizando-se marcadores isoenzimáticos. Foram amostradas as populações dos Parques Estaduais (PE) do Biribiri e Serra Nova e Parque Nacional (PN) das Sempre Vivas. Foram empregados 14 marcadores isoenzimáticos, dos quais nove locos foram polimórficos (est-2, est-3, est-4, got-1, pgi-1, mdh-4, idh-1, adh-1 e skdh-1). Os testes de ajustamento às proporções genotípicas de EHW, teste exato de Fisher e χ² não foram significativos nos locos isoenzimáticos das três populações, exceto est-4 no PE Serra Nova, mdh-4 e idh-1 no PE do Biribiri. Os valores de heterozigosidade média esperada (He) variaram entre 0,217 e 0,255, estando próximos dos encontrados em espécies arbóreas tropicais (0,204 e 0,211) com as mesmas características de distribuição geográfica de S. adstringes. O índice de fixação (F) foi significativamente menor do que zero na população do PE do Biribiri (-0,149) e não significativo no PN das Sempre Vivas (-0,031) e no PE Serra Nova (-0,138). O excesso significativo de heterozigotos estimado na população do PE do Biribiri pode significar seleção a favor desses genótipos, porém, para verificar tal possibilidade, são requeridos estudos que consideram variáveis ambientais.

          Translated abstract

          The aim of this study was to describe the genetic diversity of S. adstringens in three populations from protected areas of Minas Gerais State, Brazil, by using isozymes. We sampled populations from State Parks (SP) Biribiri and Serra Nova, and National Park (NP) Sempre Vivas. We used 14 isozyme markers, which among them nine loci were polymorphic (est-2, est-3, est-4, got-1, pgi-1, mdh-4, idh-1, adh-1 and skdh-1). The adjustment tests to EHW genotypic proportions, Fisher' s exact test and χ², were not significant to the isozyme loci in the three populations, except est-4 in SP Serra Nova, mdh-4 and idh-1 in SP Biribiri. The values of average expected heterozygosity (He) ranged between 0.217 to 0.255, and are close to those found in tropical tree species (0.204 to 0.211) with the same characteristics of geographical distribution of S. adstringes. The fixation index (F) were significantly lower than zero in the population of SP Biribiri (-0.149), and not significantly in the NP Sempre Vivas (-0.031) and SP Serra Nova (-0.138). The significant excess of heterozygotes in SP Biribiri population may be an indicative of selection in favor of these genotypes, however, to verify this possibility, further studies are required, considering environmental variables.

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          Most cited references 61

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          Árvores Brasileiras—manual de identificação e cultivo de plantas arbóreas nativas no Brasil

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            Natural Selection and Random Genetic Drift in Phenotypic Evolution

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              Population structure in Daphnia obtusa: quantitative genetic and allozymic variation.

               K Spitze (1993)
              Quantitative genetic analyses for body size and for life history characters within and among populations of Daphnia obtusa reveal substantial genetic variance at both hierarchical levels for all traits measured. Simultaneous allozymic analysis on the same population samples indicate a moderate degree of differentiation: GST = 0.28. No associations between electrophoretic genotype and phenotypic characters were found, providing support for the null hypothesis that the allozymic variants are effectively neutral. Therefore, GST can be used as the null hypothesis that neutral phenotypic evolution within populations led to the observed differentiation for the quantitative traits, which I call QST. The results of this study provide evidence that natural selection has promoted diversification for body size among populations, and has impeded diversification for relative fitness. Analyses of population differentiation for clutch size, age at reproduction, and growth rate indicate that neutral phenotypic evolution cannot be excluded as the cause.
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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                rarv
                Revista Árvore
                Rev. Árvore
                Sociedade de Investigações Florestais (Viçosa )
                1806-9088
                February 2014
                : 38
                : 1
                : 103-112
                Affiliations
                [1 ] Universidade Federal de Viçosa Brazil
                [2 ] Universidade Federal de Viçosa Brazil
                [3 ] Universidade Federal de Viçosa Brazil
                [4 ] Universidade Federal de Viçosa Brazil
                [5 ] Universidade Federal de Viçosa Brazil
                Article
                S0100-67622014000100010
                10.1590/S0100-67622014000100010
                Product
                Product Information: website
                Categories
                FORESTRY

                Forestry

                Genetic diversity, Savannah, Medicinal plants, Diversidade genética, Cerrado, Plantas medicinais

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