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| Registros recuperados: 28 | |
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| Techio,Vânia Helena; Davide,Lisete Chamma; Pereira,Antônio Vander; Bearzoti,Eduardo. |
| Cytotaxonomic studies were carried out on 26 accessions of Pennisetum spp. originating from the Active Germplasm Bank of Embrapa Gado de Leite-Juiz de Fora, Minas Gerais, Brazil.This study presents cytogenetics and reproductive morphological data for each one of these accessions, which allowed groupings and suggest botanical identifications to be established. The metaphases of the accessions characterized as P. purpureum confirmed the presence of 2n = 28 chromosomes that have already been described for this species. For the hybrids between P. purpureum and P. glaucum and for the hexaploids, resulting from the chromosome duplication of these hybrids, 2n = 21 and 2n = 42 chromosomes were confirmed, respectively. The wild accession identified as P. setosum... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Pennisetum; Cytogenetic; Taxonomy; Germplasm; Genetic divergence. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572002000200014 |
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| Oliveira,Rosana de Cássia; Nunes,Francis de Morais Franco; Campos,Ana Paula Soraggi; Vasconcelos,Soraya Matos de; Roubik,David; Goulart,Luiz Ricardo; Kerr,Warwick Estevam. |
| One of the commonest neotropical stingless bees is Tetragonisca angustula (Latreille, 1811), popularly known in Portuguese as jataí, which occurs in variable nesting sites from Mexico to Argentina. We used 18 primers to generate 218 RAPD markers which we used to determined the genetic distance between T. angustula populations from 25 localities in three different Latin America countries, using Tetragonisca weyrauchi from the Brazilian state of Acre and the common honey bee (Apis mellifera) as outgroups. Genetic distance, calculated as the Percentage of Dissimilarity (14%), based on all markers divided the T. angustula population into eastern (group 1) and western (group 2) groups. However, we were able to separate the two groups by using only two primers... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Tetragonisca angustula; Genetic divergence; Molecular markers; UPGMA. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572004000200009 |
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| Soares,Sabrina Delgado; Bandeira,Ludmila Ferreira; Ribeiro,Stela Barros; Telles,Mariana Pires de Campos; Silva,João Augusto da; Borges,Canrobert Tormin; Coelho,Alexandre Siqueira Guedes; Novaes,Evandro. |
| Abstract Given its high-valued wood, the African mahogany (Khaya grandifoliola) has been envisaged as a renewable source of tropical hardwoods in Brazil. However, there are concerns about the hypothesized low diversity among the few K. grandifoliola germplasm sources introduced in the country. Using eight microsatellite markers, we evaluated the genetic diversity and divergence among 53 superior trees selected from three provenances of K. grandifoliola located in the state of Para. These populations are among the oldest plantations (>15 years) in Brazil and, therefore, the country's main seed sources. The average number of alleles per locus was 5.9, expected heterozygosity was moderate (^=0.56) and lower than the high observed heterozygosity (HO=0.74).... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Microsatellites; SSR; Genetic structure; Genetic divergence; Hardwood. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572020000400301 |
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| Vieira,Eduardo Alano; Carvalho,Fernando Irajá Félix de; Bertan,Ivandro; Kopp,Mauricio Marini; Zimmer,Paulo Dejalma; Benin,Giovani; Silva,José Antônio Gonzalez da; Hartwig,Irineu; Malone,Gaspar; Oliveira,Antônio Costa de. |
| Molecular and morphological data analyses matrices are very informative tools for the estimation of genetic distances. We used AFLP markers, morphological traits and combined analysis to estimate the genetic distances between wheat genotypes and ascertain any associations between the two techneques. Nineteen wheat (Triticum aestivum L.) genotypes were analyzed using amplified fragment length polymorphism (AFLP) markers and field evaluated for two years. The matrices obtained by morphological and molecular marker data analyses revealed a significant but moderate correlation (r = 0.47), indicating that such techniques sample distinct genome regions. The combined analysis was found to be highly correlated with AFLP (r = 0.97) and moderately correlated with... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Reeding; Genetic divergence; Molecular markers; Morphological traits. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572007000300016 |
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| Tavares,Mara Garcia; Dias,Luiz Antonio dos Santos; Borges,Andréia Arantes; Lopes,Denilce Meneses; Busse,Angélica Helene Pereira; Costa,Ronaldo Guimarães; Salomão,Tânia Maria Fernandes; Campos,Lucio Antonio de Oliveira. |
| Allozyme, microsatellite and random amplified polymorphic DNA (RAPD) molecular markers were used to investigate the within and between population genetic variability and between population genetic differentiation of the Brazilian stingless bee uruçu amarela (nominally Melipona rufiventris Lepeletier, 1836) present in savanna and Atlantic forest habitats of the Brazilian state of Minas Gerais (MG). We found low levels of within population variability, although there were a large number of private alleles that specifically characterized these populations. The F ST values indicated a high level of genetic diversity between populations. Analysis of molecular variance (AMOVA) showed a high degree of population differentiation between the savanna and Atlantic... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Endangered species; Genetic divergence; Molecular markers; Stingless bees; Uruçu amarela. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572007000400027 |
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| Meyer,Andréia da Silva; Garcia,Antonio Augusto Franco; Souza,Anete Pereira de; Souza Jr.,Cláudio Lopes de. |
| The objective of this study was to evaluate whether different similarity coefficients used with dominant markers can influence the results of cluster analysis, using eighteen inbred lines of maize from two different populations, BR-105 and BR-106. These were analyzed by AFLP and RAPD markers and eight similarity coefficients were calculated: Jaccard, Sorensen-Dice, Anderberg, Ochiai, Simple-matching, Rogers and Tanimoto, Ochiai II and Russel and Rao. The similarity matrices obtained were compared by the Spearman correlation, cluster analysis with dendrograms (UPGMA, WPGMA, Single Linkage, Complete Linkage and Neighbour-Joining methods), the consensus fork index between all pairs of dendrograms, groups obtained through the Tocher optimization procedure and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Genetic divergence; Heterotic groups; AFLP; RAPD; Multivariate analysis. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572004000100014 |
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| Arnaud-haond, Sophie; Moalic, Yann; Hernandez-garcia, Emilio; Eguiluz, Victor M.; Alberto, Filipe; Serrao, Ester A.; Duarte, Carlos M.. |
| The recurrent lack of isolation by distance reported at regional scale in seagrass species was recently suggested to stem from stochastic events of large-scale dispersal. We explored the usefulness of phylogenetic information contained in microsatellite loci to test this hypothesis by using the Genetic Diversity Spectrum (GDS) on databases containing, respectively, 7 and 9 microsatellites genotypes for 1541 sampling units of Posidonia oceanica and 1647 of Cymodocea nodosa. The simultaneous increase of microsatellite and geographic distances that emerges reveals a coherent pattern of isolation by distance in contrast to the chaotic pattern previously described using allele frequencies, in particular, for the long-lived P. oceanica. These results suggest... |
| Tipo: Text |
Palavras-chave: Clonality; Genetic Diversity Spectrum; Genetic divergence; Microsatellites; Seagrass; Stepwise mutation. |
| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00182/29292/27733.pdf |
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| Rota, E.; Martinsson, S.; Bartoli, M.; Beylich, A.; Graefe, U.; Laini, A.; Wetzel, M.J.; Erséus, C.. |
| We analysed samples of Sparganophilus taken at the corners of its distribution area in Europe (UK, Germany and Italy). No mitochondrial genetic divergence within and amongst them was found, neither in COI nor in 16S. Further, the COI haplotype was also identical to two sequences from Ontario, Canada in the Barcoding of Life Data System (BOLD) database. Our European COI and 16S sequences showed only minimal differentiation (only 1 or 2 substitutions) from specimens newly collected in Illinois and Washington states (USA), as well as from a COI haplotype from Tennessee (USA) in BOLD. An additional COI haplotype from Illinois (found in BOLD) is 2.1% different from the other haplotypes but clearly belongs to the same lineage of Sparganophilus. This... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Aquatic megadriles; Genetic divergence; Oligochaeta; Recent introduction; Sparganophilus eiseni; Synonymy. |
| Ano: 2016 |
URL: http://www.repository.naturalis.nl/record/607666 |
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| Scheepmaker, Maarten. |
| Genetic differentiation among population samples of G. gauthieri on both sides of the Strait of Gibraltar was investigated by enzyme electrophoresis at 20 enzyme loci with reference to G. gauthieri and G. ibericus from different areas in the Iberian peninsula. Levels of divergence resolved suggest that G. gauthieri reached North Africa from the Iberian peninsula, and not vice versa. With reference to geological evidence, this was likely to occur during the Messinian (6—5 My ago). As the opening of the Strait of Gibraltar represents a well dated geological event, an attempt has been made to calibrate the molecular clock for the G. pulex-group. Indirect estimations of gene flow levels were shown to be extremely low. Probably as a consequence of frequently... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Distribution; Genetic divergence; Gene flow; Molecular clock; Gammarus. |
| Ano: 1990 |
URL: http://www.repository.naturalis.nl/record/503962 |
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| Silva, Janete Motta da; Aguiar, Ananda Virgínia de; Mori, Edson Seizo; Moraes, Mario Luiz Teixeira de. |
| O objetivo desse trabalho foi quantificar a dissimilaridade genética entre progênies de P. caribaea var. caribaea para identificar genitores divergentes, visando gerar genótipos mais produtivos e avaliar a variabilidade total por meio de alguns caracteres fenotípicos de importância comercial. Assim, um teste de progênies de P. caribaea var. caribaea foi implantado em delineamento experimental látice 10 x 10 triplo, com 99 progênies e uma testemunha comercial em Selvíria, MS. Foram avaliados os caracteres quantitativos antes e após desbaste aos 14 anos, tais como: altura total de plantas (m), diâmetro à altura do peito - DAP (cm); volume (m3 árvore-1); forma do fuste das árvores, densidade básica da madeira, na altura do DAP - DBM-1, e na metade da altura... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Parâmetros genéticos; Divergência genética; Pinheiros tropicais; Teste de progênies Genetic parameters; Genetic divergence; Tropical pines; Progeny trial. |
| Ano: 2012 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/194 |
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| Aksic,Milica Fotiric; Rakonjac,Vera; Nikolic,Dragan; Zec,Gordan. |
| The objective of this work was to evaluate variability in reproductive biology traits and the correlation between them in genotypes of 'Oblačinska' sour cherry (Prunus cerasus). High genetic diversity was found in the 41 evaluated genotypes, and significant differences were observed among them for all studied traits: flowering time, pollen germination, number of fruiting branches, production of flower and fruit, number of flowers per bud, fruit set, and limb yield efficiency. The number of fruiting branches significantly influenced the number of flower and fruit, fruit set, and yield efficiency. In addition to number of fruiting branches, yield efficiency was positively correlated with fruit set and production of flower and fruit. Results from principal... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Prunus cerasus; Breeding; Genetic divergence; Pollen germination; Principal component analysis; Yield efficiency. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2013000100005 |
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| Nörnberg,Rafael; Silva,José Antonio Gonzalez da; Luche,Henrique de Souza; Tessmann,Elisane Weber; Kavalco,Sydney Antonio Frehner; Zimmer,Cristiano Mathias; Baretta,Diego; Maia,Luciano Carlos da; Oliveira,Antonio Costa de. |
| Abstract:The objective of this work was to characterize the performance of elite wheat genotypes from different Brazilian breeding programs for traits associated with grain yield and preharvest sprouting. The study was conducted in 2010 and 2011 in the municipality of Capão do Leão, in the state of Rio Grande do Sul, Brazil, in a randomized complete block design with three replicates. Thirty-three wheat genotypes were evaluated for traits related to preharvest sprouting and grain yield. The estimate of genetic distance was used to predict potential combinations for selection of plants with high grain yield and tolerance to preharvest sprouting. The combined analysis of sprouted grains and falling number shows that the TBIO Alvorada, TBIO Mestre, Frontana,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Triticum aestivum. ear sprouting; Falling number; Genetic divergence; Parental selection.. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2015000800698 |
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| FABIANE,KELI CRISTINA; WAGNER JÚNIOR,AMÉRICO; ZANELA,JULIANO; HOSSEL,CRISTIANO; CITADIN,IDEMIR. |
| ABSTRACT Peach is much appreciated by consumers and its popularity is mainly related with organoleptic characteristics. However, with emergence of concepts of functional foods (health promoters), there is high interest to study and to quantify the biochemical components of fruits. The aim of this work was to perform the biochemical characterization of peach genotypes, evaluating the genetic diversity and selecting those with desirable biochemical qualities for use as parents in future breeding programs. The experiment was carried out at the Laboratory of Plant Physiology - UTFPR - Campus of Dois Vizinhos, PR (Brazil), with fruits from 26 and 29 peach genotypes (Prunus persica) in the 2009/2010 and 2010/2011 crop years, respectively. The experimental... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biochemical compounds; Genetic divergence; Prunus persica. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452017000400803 |
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| Silva,Anderson Rodrigo da; Cecon,Paulo Roberto; Dias,Carlos Tadeu dos Santos; Puiatti,Mário; Finger,Fernando Luiz; Carneiro,Antônio Policarpo Souza. |
| Multivariate techniques have become a useful tool for studying the phenotypic diversity of Germplasm Bank accessions, since they make it possible to combine a variety of different information from these accessions. This study aimed to characterize the phenotypic dispersion of garlic (Allium sativum L.) using two multivariate techniques with different objective functions. Twenty accessions were morphologically characterized for bulb diameter, length, and weight; number of cloves per bulb; number of leaves per plant; and leaf area. Techniques based on generalized quadratic distance of Mahalanobis, UPGMA (Unweighted Pair Group Method with Arithmetic Mean) clustering, and nMDS (nonmetrric MultiDimensional Scaling) were applied and the relative importance of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Allium sativum L.; NMDS; UPGMA; Genetic divergence. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000100005 |
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| Registros recuperados: 28 | |
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