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| Registros recuperados: 158 | |
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| Azevedo,Cecília O.; Borba,Eduardo L.; Van Den Berg,Cássio. |
| Hybridization between B. involutum and B. weddellii (Orchidaceae) has been first observed in the Serra do Cipó, Minas Gerais State, Brazil, the hybrid being described as B. ×cipoense Borba & Semir. In this study, allozime electrophoresis was used to test the hypothesis of occurrence of hybridization between these two species, as suggested by morphological characters, in the Chapada Diamantina, Bahia State, Brazil. The lack of a diagnostic locus does not allow definite confirmation of the natural hybridization, although this hypotheses is reinforced by the absence of exclusive alleles in the putative hybrid individuals. The existence of several different genotypes points out to either population derived from multiple hybridization events or the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bulbophyllum; Genetic variability; Hybridization; Introgression; Orchidaceae. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042006000300008 |
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| CARDIM,DARUSKA CAVALCANTE; CARLINI-GARCIA,LUCIANA APARECIDA; MONDIN,MATEUS; MARTINS,MARINA; VEASEY,ELIZABETH ANN; ANDO,AKIHIKO. |
| Com o objetivo de estudar a variabilidade genética intra-específica em Oncidium varicosum Lindl. (Orchidaceae - Oncidiinae), foram avaliadas cinco populações de Minas Gerais, coletadas em Alfenas (AL), Estiva (ES), Pedra do Coração (PC), Pedra Branca (PB) e Pouso Alegre (PA). Foram considerados 22 caracteres florais, medidos a partir de "vouchers" (fichas florais), empregando-se métodos estatísticos univariados e multivariados (análise discriminante canônica - CDA e análise de agrupamento a partir de distância de Mahalanobis). Houve diferença significativa (p < 0,05) entre populações, pelo teste F, para 13 caracteres. O primeiro eixo canônico separou a população PA de PB e de PC. Os indivíduos de PA são menores que os de PC, que são menores que os de... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Orchidaceae; Oncidium varicosum; Morphometric analysis; Genetic variability; Multivariate analysis. |
| Ano: 2001 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042001000500010 |
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| Leite,Maria C. B. S.; Farias,Andreza R. B. de; Freire,Fernando J.; Andreote,Fernando D.; Kuklinsky-Sobral,Júlia; Freire,Maria B. G. S.. |
| ABSTRACT The selection of salinity tolerant bacteria may provide greater promotion of plant growth in soils with salt stress. This study aimed to isolate and select bacterial isolates of sugarcane, tolerant to salinity and plant growth promoters, and assess genetic diversity. To do so, endophytic root and rhizosphere of sugarcane, were isolated in culture medium with and without NaCl. The bacterial population density, the potential for biological nitrogen fixation (BNF), production of indole acetic acid (IAA), inorganic phosphate solubilization and quorum sensing molecule production were evaluated. Furthermore, the genetic diversity was assessed by Denaturing Gradient Gel Electrophoresis (DGGE) of nifH. Salinity tolerance tests were also conducted. There... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Endophytic; Genetic variability; Plant growth promotion. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662014001300073 |
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| Twerdochlib,Adriana L.; Bonna,Ana C. Dalla; Leite,Selene S.; Chitolina,Rodrigo F.; Westphal,Betina; Navarro-Silva,Mario A.. |
| Genetic variability of a population of Aedes aegypti from Paraná, Brazil, using the mitochondrial ND4 gene. To analyze the genetic variability of populations of Aedes aegypti, 156 samples were collected from 10 municipalities in the state of Paraná, Brazil. A 311 base pairs (bp) region of the NADH dehydrogenase subunit 4 (ND4) mitochondrial gene was examined. An analysis of this fragment identified eight distinct haplotypes. The mean genetic diversity was high (h = 0.702; p = 0.01556). AMOVA analysis indicated that most of the variation (67%) occurred within populations and the F ST value (0.32996) was highly significant. F ST values were significant in most comparisons among cities. The isolation by distance was not significant (r = -0.1216 and p = 0,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Aedes aegypti; Genetic variability; Mitochondrial DNA; Genetic population; State of Paraná. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262012000200013 |
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| Calado,Daniéla; Navarro-Silva,Mario Antonio; Sallum,Maria Anice Mureb. |
| The aim of the present study was to examine genetic variability in populations of An. cruzii by employing PCR-RAPD and PCR-RFLP markers. All analyses were carried out using individuals of the F1 generation of wild caught females obtained in Santa Catarina State (Florianópolis and São Francisco do Sul), Paraná State (Morretes, Paranaguá and Guaratuba) and São Paulo State (Cananéia). In the PCR-RAPD experiments, seven primers were used for comparisons within and among populations. The restriction profile of the ITS2 including a fragment of both 5.8S and 28S regions of the rDNA was obtained with the enzymes BstUI, HaeIII, TaqI, HhaI, Sau96I, HinfI, HincII and NruI. The PCR-RAPD method detected a large number of polymorphic bands. Genetic distance among... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Anophelinae; Genetic variability; ITS2; Molecular markers. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262006000300014 |
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| Santos,Silvia Correa; Carvalho,Raquel dos Santos; Davide,Livia Maria Chamma. |
| Abstract The genus Anacardium presents nine species, of these, three have sub-bush size, common in the Cerrado of the Center-West of Brazil. The objective of this work was to evaluate the genetic variability of the species, collected in eleven provenances, using RAPD markers. Genomic DNA from 122 accessions was extracted and amplified with 25 decamer primers. The results indicated polymorphism, ranging from 77.71% to 96.18%. The distribution of genetic diversity among and within populations shows that 27.14% of the variability is found between populations and 37.44% within the populations, suggesting the existence of genetic variability that may be related to the reproductive strategies adopted by the species throughout its evolution. The index of... |
| Tipo: Info:eu-repo/semantics/other |
Palavras-chave: Genetic variability; Diversity; Native species; Cerrado. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452020000100802 |
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| Alcoforado,Ayulle Thalía Watson; Pedrozo,Cássia Ângela; Mayer,Marcos Miguel; Lima-Primo,Hyanameyka Evangelista de. |
| Abstract The objective of this study was to estimate coefficients of repeatability, to determine the minimum number of fruits necessary for genotype selection and to estimate phenotypic correlation coefficients between morpho-agronomic characters of Theobroma grandiflorum fruits. It was evaluated twenty - two genotypes of an agroforestry system implanted in the municipality of Cantá - RR. Ten fruits per genotype were collected and evaluated for longitudinal length, transverse diameter, total weight, peel thickness, peel weight, pulp weight, placental weight and wet seed weight. Four statistical methods were used to estimate the repeatability coefficients: variance analysis, main components based on the correlation matrix and the covariance matrix, and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Genetic variability; Selection of genotypes; Phenotypic correlation. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452019000200801 |
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| Danner,Moeses Andrigo; Citadin,Idemir; Sasso,Simone Aparecida Zolet; Sachet,Marcos Robson; Mazaro,Sérgio Miguel. |
| The purpose of this study was to characterize cultivated genotypes of three jabuticaba species (Plinia cauliflora, P. trunciflora, and P. jaboticaba). Phenology and fruit growth, as well as leaf, flower and fruit traits were evaluated. Variability in all traits was observed among genotypes of the three jabuticaba species. The trait peduncle size is indicated for differentiation of the three species under study. The leaf and fruit sizes of the genotypes P. trunciflora 3, P. trunciflora 4, P. trunciflora 5 and P. jaboticaba 1 differ from those described in the literature for these species, indicating the formation of ecotypes. Jabuticaba fruit skin contains high anthocyanin and flavonoid concentrations, with potential use in food and pharmaceutical industries. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Plinia sp; Germplasm bank; Genetic variability; Fruit quality. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452011000300019 |
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| Mariante,Arthur da Silva; Egito,Andréa Alves; Albuquerque,Maria do Socorro Maués; Paiva,Samuel Rezende; Ramos,Alexandre Floriani. |
| Most livestock are not indigenous to Brazil. Several animal species were considered domesticated in the pre-colonial period, since the indigenous people manage them as would be typical of European livestock production. For over 500 years there have been periodic introductions resulting in the wide range of genetic diversity that for centuries supported domestic animal production in the country. Even though these naturalized breeds have acquired adaptive traits after centuries of natural selection, they have been gradually replaced by exotic breeds, to such an extent, that today they are in danger of extinction To avoid further loss of this important genetic material, in 1983 Embrapa Genetic Resources and Biotechnology decided to include conservation of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Animal genetic resources; Brazilian conservation program; Genetic variability; Microsatellites. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982008001300016 |
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| Cunha,Elizângela Emídio; Euclydes,Ricardo Frederico; Lopes,Paulo Sávio; Torres,Robledo de Almeida; Carneiro,Paulo Luiz Souza. |
| The aim of this work was to investigate the short-term behavior of the genetic variability of quantitative traits simulated from models with additive and non-additive gene action in control and phenotypic selection populations. Both traits, one with low (h² = 0.10) and the other with high (h² = 0.60) heritability, were controlled by 600 biallelic loci. From a standard genome, it was obtained six genetic models which included the following: only the additive gene effects; complete and positive dominance for 25, 50, 75 and 100% of the loci; and positive overdominance for 50% of the loci. In the models with dominance deviation, the additive allelic effects were also included for 100% of the loci. Genetic variability was quantified from generation to... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Closed population; Computer simulation; Dominance deviation; Genetic variability; Intralocus interaction. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010000900013 |
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| Silva,Elizabete Cristina da; Dutra Junior,Wilson Moreira; Ianella,Patrícia; Gomes Filho,Manoel Adrião; Oliveira,Cláudio José Parro de; Ferreira,Débora Nathália de Moura; Caetano,Alexandre Rodrigues; Paiva,Samuel Rezende. |
| This study estimated the genetic diversity and structure of 12 genetic groups (GG) of locally adapted and specialized pigs in the state of Pernambuco using 22 microsatellite markers. Nine locally adapted breeds (Baé, Caruncho, Canastra, Canastrão, Mamelado, Moura, Nilo, Piau and UDB (Undefined Breed)) and 3 specialized breeds (Duroc, Landrace and Large White), totaling 190 animals, were analyzed. The Analysis of Molecular Variance (AMOVA) showed that 3.2% of the total variation was due to differences between genetic groups, and 3.6% to differences between local and commercial pigs. One hundred and ninety eight alleles were identified and apart from the Large White breed, all GG presented Hardy-Weinberg Equilibrium deviations for some loci. The total and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Animal genetics resources; Genetic variability; Microsatellites loci; Sus Scrofa. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982011000800010 |
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| Dallastra,Anderson; Unêda-Trevisoli,Sandra Helena; Ferraudo,Antonio Sergio; Di Mauro,Antonio Orlando. |
| Efficiency in the use of genetic variability, whether existing or created, increases when properly explored and analysed. Incorporation of biotechnology into breeding programs has been the general practice. The challenge for the researcher is the constant development of new and improved cultivars. The aim of this experiment was to select progenies with superior characteristics, whether or not carriers of the RR gene, derived from bi-parental crosses in the soybean, with the help of multivariate techniques. The experiment was carried out in a family-type experimental design, including controls, during the agricultural year 2010/2011 and 2011/2012 in Jaboticabal in the Brazilian State of São Paulo. From the F3 generation, phenotypically superior plants were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Glycine max; Genetic variability; Multivariate analysis. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902014000300021 |
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| Freitas,Suzane Fonseca; Moreira,Heden Luiz Marques; Souza,Daiane Machado; Moreira,Carla Giovane Ávila; Tavares,Rafael Aldrighi; Dionello,Nelson José Laurino. |
| ABSTRACT This study aimed to develop PCR assays, reaction combinations, and validation of tetranucleotide SSR loci for tilapia, to minimize the impact of erroneous allele inferences on genotype determination of this marker. Microsatellites containing tetranucleotide repeats were obtained from tilapia genome, version 2.1, avoiding loci in the same linking group. Primers were designed for different fragment sizes, and fluorescence added to each locus. A total of 10 loci were amplified, separately and in combination, and loaded into a single capillary sequencer panel. Alleles were amplified without stutters and easily interpreted. PCR amplifications of DNA repeatedly extracted from samples, and genotyping at different PCR rounds were performed to infer allele... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Genetic variability; Genotyping; Microsatellite markers. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902020000400409 |
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| Mathioni,Sandra Marisa; Carvalho,; Brunelli,Kátia Regiane; Beló,André; Camargo,Luis Eduardo Aranha. |
| For many years, the gray leaf spot disease (GLS) caused by the fungus Cercospora zeae-maydis Tehon & Daniels, was not considered an important pathogen of maize (Zea mays, L.) in Brazil. However, the recent adoption of agronomical practices such as no-tillage and cultivation under central pivot irrigation systems increased the incidence and severity to the extent that GLS is now one of the most important diseases of maize. Isolates of C. zeae-maydis can be distinguished by two genetic groups (I and II) based on AFLP markers and on polymorphisms of the ITS and 5.8S rDNA regions. Until now, however, the biological implications of this distinction remain unclear. This study investigated whether isolates from the two genetic groups differ in... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Disease resistance; Gray leaf spot; Genetic variability; Pathogenicity. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000600006 |
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| Cabral,Betânia Lúcia Rocha; Souza,Joelson Araújo de; Ando,Akihiko; Veasey,Elizabeth Ann; Cardoso,Eloisa Maria Ramos. |
| Cassava (Manihot esculenta Crantz) belongs to the Euphorbiaceae family, and is widely cultivated in Brazil. The objective of this study was to evaluate the isoenzymatic variability of 200 cassava accessions from the germplasm bank of Embrapa Amazonia Oriental. Seven groups were formed according to their origin: 1-Amazonas, 2-Amapa, 3-Bahia, 4-Para, 5-Rondonia, 6-Various, for accessions with a maximum of three individuals per place of origin, and 7 - Accessions of indefinite origin. The accessions were also evaluated as a whole. For the electrophoretic analyses, samples of young leaves were used in a 12% starch gel. Eight isoenzymatic systems were evaluated: acid phosphatase (ACP), leucine aminopeptidase (LAP), glucose-6-phosphate dehydrogenase (G6PDH),... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Manihot esculenta; Genetic variability; Germplasm bank; Isozymes. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000300017 |
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| Registros recuperados: 158 | |
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