Genetic variability of pre and post-fragmentation cohorts of Aspidosperma polyneuron Muell. Arg. (Apocynaceae)

Torezan, José Marcelo Domingues; Souza, Rui Fragassi; Ruas, Paulo Maurício; Ruas, Claudete de Fátima; Camargo, Elvis Hassmann; Vanzela, André Luís Laforga

doi:10.1590/s1516-89132005000200002

Cited by 30 publications

(24 citation statements)

References 15 publications

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“…These primers were chosen based on the polymorphism and their efficiency on studies of genetic diversity of two species of the genus Aspidosperma (Apocynaceae) (Torezan et al, 2005;Bezerra, 2014).…”

Section: Rapd Reactionmentioning

confidence: 99%

Research Article Genetic diversity in a Poincianella pyramidalis (Tul.) L.P. Queiroz population assessed by RAPD molecular markers.

et al. 2017

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ABSTRACT. Poincianella pyramidalis (Tul.) L.P. Queiroz is an endemic Caatinga (Brazilian savannah biome) species that has been exploited for different purposes, although information is necessary about still existing natural populations. The objective of this study was to evaluate the genetic diversity among 20 P. pyramidalis individuals occurring in a population localized in the Caatinga biome of Paraíba State, aiming at seed collection, using RAPD markers. For the DNA extraction, young shoots of the individuals were used, and amplification was carried out using 20 primers. The obtained markers were converted to a binary matrix, from which a genetic dissimilarity matrix was built using the arithmetic complement of Jaccard's coefficient, and the dendrogram was built by the UPGMA analysis. No amplified fragment was monomorphic, resulting in 100% polymorphism of the analyzed population. The mean genetic diversity among the matrices was 63.28%, ranging from 30.9 to 97.7%. Individuals 09 and 17 showed relevant genetic proximity, and thus planting their seedlings at close sites would not be indicated. The population evaluated in this study showed high genetic diversity, originating twelve groups from the UPGMA hierarchical cluster analysis. Based on the results, individuals 09 and 17 can provide plant material for the evaluation of the physiological performance of P. pyramidalis seeds, and the set of individuals of this population has a high genetic diversity that characterizes them as adequate matrices for projects of restoration and conservation of the seed species.

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Section: Rapd Reactionmentioning

confidence: 99%

Research Article Genetic diversity in a Poincianella pyramidalis (Tul.) L.P. Queiroz population assessed by RAPD molecular markers.

et al. 2017

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“…Total genetic diversity (H T ) was 0.387 and I were 0.460 and 0.549, for samples from the flat and the high declivity regions, respectively (Table 1). Torezan et al (2005) used random amplified polymorphic DNA (RAPD) markers to assess genetic variation in samples A. polyneuron from six forest fragments, including five fragments that had been severely impacted by anthropic exploitation and one fragment within a conservation unit that is free of anthropogenic factors. The authors found fairly low values of H T = 0.278, even when only the conservation unit was considered (H S = 0.285 and I = 0.387), compared to those in this study (Table 1).…”

Section: Genetic Variability Of Samplesmentioning

confidence: 99%

“…Arg (Apocynaceae) is a long-lived tropical tree species that can reach over 1200 years (Carvalho, 1994). The trees have a slow growth rate, taking 10 to 15 years to increase 5 cm in diameter at breast height and around 50 years to reach the reproductive stage (Torezan et al, 2005). This species grows to 20-30 m in height and its trunk can reach 60 to 90 cm in diameter.…”

Section: Introductionmentioning

confidence: 99%

Genetic differentiation in Aspidosperma polyneuron (Apocynaceae) over a short geographic distance as assessed by AFLP markers

Jo¹,

Ea²,

La³

et al. 2011

Genet. Mol. Res.

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ABSTRACT. Studies on intraspecific variation can contribute to the development of conservation strategies by identifying units of conservation for threatened species. Aspidosperma polyneuron is a tropical tree of seasonal semideciduous forests that is currently endangered and protected because it has been heavily logged for lumber, although it was once common in Brazil and neighboring countries. We investigated genetic structure in two samples of A. polyneuron collected from steep hillsides and from flat areas of a natural forest fragment in northern Paraná State, Brazil. Seven AFLP primer combinations yielded 200 markers, with a polymorphic rate of 88.5% for samples from the flat area and 99% for samples from the high declivity area. Total genetic diversity (H T ) was 0.387, while the genetic diversity Genetic differentiation in Aspidosperma polyneuron within the populations (H S ) was 0.307 and 0.372, for samples from the flat and the high declivity areas, respectively. Genetic differentiation between samples was high, with a mean F ST of 0.265 and a genetic distance of 0.148, indicative of a high degree of genetic structure over a short distance. Principal coordinate analysis separated the samples into three groups of individuals; the first group included individuals from the high declivity area, the second group consisted of individuals only from the flat area, and the third group had individuals from both areas. Bayesian analysis also showed K = 3 clusters. The unexpected high level of intraspecific variation of A. polyneuron in this small forest fragment should be taken into account when evaluating the genetic impact of forest degradation on this species in other semideciduous forest fragments.

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“…Na literatura, a maioria das pesquisas é baseada na caracterização florística e estrutural em fragmentos de ocorrência natural das espécies. Alguns avanços nos estudos de diversidade genética com marcadores moleculares foram contemplados com Torezan et al (2005), Damasceno et al (2011), Zimback et al (2011. Entretanto, trabalhos sobre desenvolvimento e variação genética para os caracteres de crescimento são escassos, sendo o mais recente publicado em 2008 (Sato et al, 2008).…”

Section: Introductionunclassified

VARIAÇÃO FENOTÍPICA PARA CARACTERES SILVICULTURAIS EM POPULAÇÕES DE Aspidosperma spp. SEM ESTRUTURA DE PROGÊNIES

Recco¹,

Santos²,

Souza³

et al. 2016

Rev. Inst. Florest.

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; Mario Luiz Teixeira de MORAES 6 RESUMO -O objetivo deste estudo foi estimar os parâmetros genéticos para os caracteres silviculturais em Aspidosperma polyneuron Müll.Arg. e Aspidosperma cylindrocarpon Müll.Arg., para fins de conservação ex situ e uso em programas de recuperação ambiental. A coleta de sementes foi feita em árvores de polinização aberta no município de Andradina-SP e o teste experimental foi instalado na Fazenda de Ensino e Pesquisa (FEPE/UNESP), em 1997, com as espécies consorciadas com Inga marginata Willd. (ingá feijão) em linhas alternadas. O delineamento experimental utilizado foi o de blocos casualizados completos com dois tratamentos (Aspidosperma spp.), 32 repetições com parcelas lineares e 4 plantas por parcela. Aos 15 anos de idade foram mensurados diâmetro à altura do peito -DAP, altura de total -ALT e sobrevivência -SOB e os parâmetros genéticos foram estimados pelo programa Selegen. A espécie cylindrocarpon apresentou maior desenvolvimento nos caracteres de crescimento (DAP e ALT) quando comparada com A. polyneuron. A taxa de sobrevivência foi de 71% demostrando boa adaptabilidade para ambas as espécies ao local de implantação do experimento. A acurácia foi alta, sugerindo maior confiabilidade das análises estatísticas. A herdabilidade foi moderada, indicando considerável controle genético nas espécies quando se observa que o coeficiente de determinação dentro de parcela foi menor que 10% para ALT e DAP, mostrando que as parcelas lineares são homogêneas, ou seja, o delineamento experimental adotado foi eficiente. Portanto, a ausência do uso de estrutura de progênies nas populações de Aspidosperma spp. estudadas não impossibilitou que fossem obtidas informações relevantes sobre as populações naturais de Aspidosperma, porém vale ressaltar que é de suma importância que novas coletas de sementes sejam realizadas para um estudo com base em teste de progênies.Palavras-chave: conservação genética; parâmetros genéticos; peroba-rosa; peroba-poca; recuperação ambiental.

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Genetic variability of pre and post-fragmentation cohorts of Aspidosperma polyneuron Muell. Arg. (Apocynaceae)

Cited by 30 publications

References 15 publications

Research Article Genetic diversity in a Poincianella pyramidalis (Tul.) L.P. Queiroz population assessed by RAPD molecular markers.

Research Article Genetic diversity in a Poincianella pyramidalis (Tul.) L.P. Queiroz population assessed by RAPD molecular markers.

Genetic differentiation in Aspidosperma polyneuron (Apocynaceae) over a short geographic distance as assessed by AFLP markers

VARIAÇÃO FENOTÍPICA PARA CARACTERES SILVICULTURAIS EM POPULAÇÕES DE Aspidosperma spp. SEM ESTRUTURA DE PROGÊNIES

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