Divergência genética entre populações de coqueiro-gigante-do-Brasil

Ribeiro, Felipe; Soares, Antonio Resende; Ramalho, Magno Antônio Patto

doi:10.1590/s0100-204x1999000900012

Cited by 15 publications

(13 citation statements)

References 4 publications

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“…Assim, o estudo da variabilidade genética em plantas é um pré-requisito essencial para a identificação de genótipos superiores. Entre as técnicas multivariadas disponíveis, as variáveis canônicas e a análise de agrupamento a partir das distâncias de Mahalanobis (D2) têm sido as mais usadas na avaliação da divergência genética em várias espécies (Ribeiro et al, 1999;Daher et al, 2000;Nascimento Filho et al, 2001).…”

Section: Introductionunclassified

Velocidade de estabelecimento de acessos de amendoim forrageiro na Amazônia Ocidental

et al. 2003

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RESUMO -O objetivo deste estudo foi avaliar a velocidade de estabelecimento de acessos de amendoim forrageiro (Arachis repens e Arachis pintoi), visando selecionar materiais adaptados aos sistemas intensivos de produção pecuária do Acre. O delineamento experimental utilizado foi de blocos casualizados, com quatro repetições. Os tratamentos consistiram de dois acessos de A. repens, sete acessos e duas cultivares de Arachis pintoi identificados como promissores para as condições ambientais de Rio Branco, Acre. Foi adotado como testemunha A. pintoi cv. Amarillo. Os acessos Ap 65, Ap 39 e Ar 10, com desempenho semelhante às cultivares Amarillo e Belmonte, destacaram-se por apresentar excelente velocidade de estabelecimento, com índice de sobrevivência das mudas e cobertura do solo superiores a 80% e comprimento dos estolões acima de 85 cm, respectivamente, aos 50, 70 e 120 dias após o plantio. Estes genótipos apresentaram produtividade de matéria seca (MS) superior a 2.300 kg/ha, taxas de acúmulo de MS iguais ou superiores a 20 kg/ha/dia e teor de proteína bruta variando entre 17,9 e 21,7%, no final do período de estabelecimento. Entre os quatro grupos heteróticos, o formado pelo acesso Ap 39 destacou-se dos demais, por apresentar valores médios a altos para todas as características avaliadas, de acordo com a análise de agrupamento realizada pelo Método de Otimização de Tocher, com base na distância generalizada de Mahalanobis. Para que os materiais promissores possam ser recomendados para uso nos sistemas intensivos de produção de bovinos no Acre, devem ser desenvolvidos estudos adicionais com relação à: 1) produtividade e qualidade de MS nos períodos chuvoso e seco; 2) ocorrência de pragas e doenças; 3) produção de sementes; 4) adaptação a solos de baixa permeabilidade; 5) compatibilidade com gramíneas forrageiras e espécies arbóreas e arbustivas perenes; 6) produção animal e persistência sob pastejo.Palavras-chave: Amarillo, Arachis pintoi, Arachis repens, Belmonte, diversidade genética, leguminosa Speed of Establishment of Accessions of Forage Peanut in the Western AmazonABSTRACT -The objective of this study was to evaluate the speed of establishment of accessions of Arachis repens and Arachis pintoi with the purpose of selecting materials capable of producing adequate quantities of high quality forage, according to the requirements of the intensive cattle production systems of Acre. The experimental design was a randomized block with four replications. The treatments consisted of two accessions of Arachis repen, seven accession and two cultivars of Arachis pintoi, identified as promising for the environmental conditions of Rio Branco, Acre. The control treatment was A. pintoi cv. Amarillo. The accessions Ap 65, Ap 39 and Ar 10, with performance similar to the cultivars Amarillo and Belmonte, were selected because of their excellent speed of establishment with index of survival of stolon and rhizome plantings and ground cover higher than 80% and length of stolons above 85 cm, respectively, 50, 70 and 120 days af...

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Section: Introductionunclassified

Velocidade de estabelecimento de acessos de amendoim forrageiro na Amazônia Ocidental

et al. 2003

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“…This corroborates the historical evidence of recent coconut tree introduction from different regions of the world in Mexico. Ribeiro (1993) assessed fruit traits by multivariate statistical analysis, in five giant coconut tree populations in Brazil and identified one population (Gigante do Brasil, from Santa Rita) as more divergent than the others. However, only four of the nineteen traits assessed were significantly differentiated.…”

Section: Introductionmentioning

confidence: 99%

Assessment of coconut tree genetic divergence by compound sample RAPD marker analysis

Daher¹,

Pereira²,

Tupinamba³

et al. 2002

CBAB

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The coconut tree (Cocos nucifera L.) is a tropical species widely cultivated throughout the world, which is found in all intertropical regions. The species shows wide phenotypic variability, which, however, is little understood at the genetic level. This study of the variability among the various coconut tree populations is important to increase the efficiency of the development of superior cultivars adapted to different ecological conditions. It also helps the selection of divergent progenies that can maximize heterosis in hybridizations. Genetic divergence among 19 coconut tree populations available in the BAG -Coco at EMBRAPA/CPATC was estimated by RAPD. Leaf samples from 21 plants of each cultivar were squashed together (compound samples) in liquid nitrogen and the DNA extracted using the modified Doyle and Doyle (1990) protocol. Samples of these DNA were amplified with 24 primers of the OPERON Technologies series. One hundred and twenty-seven polymorphic and 61 monomorphic loci were obtained. Six different clusters, possibly heterotic groups, were formed by the Tocher optimized clustering analysis which used the matrix of the complement of the Jaccard index. Group 1 included the dwarf group cultivars. Giant accessions, abbreviated to GBR (Brazilian Giant), formed group 2, except GBRPF, which together with West African Giant (GOA) formed group 4. The most distant accession was the Tonga Giant cultivar (GTG) that did not group with the others and presents potential for hybridization with the six cultivars in the dwarf group cultivars and with the five in the GBR group. Group 3 consisted of GRL, GPY and GRT and Group 5 of GML and GVT. The dendrogram obtained by the nearest neighbor method was in line with the clustering obtained by the Tocher optimization method. The markers used permitted identification of each one of the populations showing that they were genetically different (absence of duplicity). The use of compound samples was effective to investigate the interpopulational genetic diversity. However, to understand the intrapopulation genetic variability, individual sampling should be used.

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“…Multivariate methods have already been used in identifying traits that are best for discrimination between genotypes in various crops (Fonseca and da Silva, 1999;Ribeiro et al, 1999;Martel et al, 2003;Coelho et al, 2007;Oliveira et al, 2007;Silva et al, 2008;Pinto et al, 2010;Cabral et al, 2011); however, the use of such methods for B. ruziziensis has not been reported. For the genus Brachiaria, Assis et al (2003) assessed vegetative, reproductive and pubescence traits (24 traits in all) for the purpose of correct placement of 301 accessions in the species to which they belonged.…”

Section: Discussionmentioning

confidence: 99%

Phenotypic characteristics for discrimination between advanced genotypes of Brachiaria ruziziensis

et al. 2016

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ABSTRACT. The aim of this study was to use multivariate methods and Pearson and partial correlations to disregard phenotypic characteristics that contribute little to differentiation between Brachiaria ruziziensis genotypes. Eighty-one genotypes of B. ruziziensis were assessed in completely randomized blocks with three replications. Ten phenotypic characteristics were assessed: plant height, leaf length, leaf width, sheath length, length of the flower stem, length of the inflorescence axis, number of racemes per inflorescence, length of the basal raceme, number of spikelets per basal raceme, and width of the rachis. The best traits for differentiation between genotypes were determined by assessing relative contribution to diversity, canonical variables, as well as Pearson and partial correlations. Four canonical variables were found to account for 57% of the overall variation, while plant height, sheath length, and number of racemes per inflorescence were considered traits that could potentially be disregarded in future assessments.

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Divergência genética entre populações de coqueiro-gigante-do-Brasil

Cited by 15 publications

References 4 publications

Velocidade de estabelecimento de acessos de amendoim forrageiro na Amazônia Ocidental

Velocidade de estabelecimento de acessos de amendoim forrageiro na Amazônia Ocidental

Assessment of coconut tree genetic divergence by compound sample RAPD marker analysis

Phenotypic characteristics for discrimination between advanced genotypes of Brachiaria ruziziensis

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