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Registros recuperados: 77
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Africanization in the United States: Replacement of Feral European Honeybees (Apis mellifera L.) by an African Hybrid Swarm IPB - Escola Superior Agrária
Pinto, M. Alice; Rubink, William L.; Patton, John C.; Coulson, Robert N.; Johnston, J. Spencer.
The expansion of Africanized honeybees from South America to the southwestern United States in 50 years is considered one of the most spectacular biological invasions yet documented. In the American tropics, it has been shown that during their expansion Africanized honeybees have low levels of introgressed alleles from resident European populations. In the United States, it has been speculated, but not shown, that Africanized honeybees would hybridize extensively with European honeybees. Here we report a continuous 11-year study investigating temporal changes in the genetic structure of a feral population from the southern United States undergoing Africanization. Our microsatellite data showed that (1) the process of Africanization involved both maternal...
Tipo: Article Palavras-chave: Africanized honey bee; Hybridization; Assignment test; Gene flow; Microsatellites.
Ano: 2005 URL: http://hdl.handle.net/10198/2888
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Allelic diversity in populations of Solanum lycocarpum A. St.-Hil (Solanaceae) in a protected area and a disturbed environment Acta Botanica
Moura,Tânia Maria de; Sebbenn,Alexandre Magno; Martins,Karina; Moreno,Maria Andreia; Oliveira,Giancarlo Conde Xavier; Chaves,Lázaro José; Kageyama,Paulo Yoshio.
This study aimed to compare the genetic diversity of populations of Solanum lycocarpum A.St.-Hil between natural and human disturbed environments, with the assumption that protected areas have greater genetic diversity than disturbed areas. For this study, two populations were sampled in Goiás State, Brazil. One was located in a conservation unit, Serra de Caldas Novas State Park, in the Caldas Novas municipality. The other was located in a pasture area in the municipality of Morrinhos. The two populations are 41 km apart. We sampled 60 individuals from each population, which were genotyped with five microsatellite loci (SSR). The highest number of alleles was recorded in the population of the conservation unit, where we found 11 exclusive and five rare...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cerrado; Gene flow; Conservation genetics; Genetic diversity.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062011000400023
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Allozymic variation and differentiation in the chilean blue mussel, Mytilus chilensis, along its natural distribution Genet. Mol. Biol.
Toro,Jorge E.; Castro,Grace C.; Ojeda,Johana A.; Vergara,Ana M..
Genetic differentiation in the Chilean blue mussel Mytilus chilensis (Hupé 1854) was investigated based on the variation in the allozyme frequencies of Pgm, Gpi, Icd, Me, Gsr, Lap and Pep in eight samples collected along 1800 km from Arauco (VIII Region) to Punta Arenas (XII Region). Despite the large geographic separations, values of Neis unbiased genetic distance, D (0.004-0.048) and standardised genetic variation among populations, Fst (0.011-0.055) were small. The levels of gene flow (Nm = 8) found in this study prevent the effect of differentiation among populations by genetic drift. This findings indicate that its long-lived planktotrophic larvae provides this species with considerable dispersal ability throughout its range which is favoured by the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Allozyme; Mytilus chilensis; Population genetics; Gene flow; Chile.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572006000100031
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An update on genetically modified crops Ciencia e Investigación Agraria
Schwember,Andrés R.
A. R. Schwember. 2008. An update on genetically modified crops. Cien. Inv. Agr. 35(3):231-250. Genetically modified (GM) crops were introduced in the mid 1990s and two principal transgenic technologies currently domínate the market, herbicide-tolerant (HT) crops and insect-resistant crops (Bacillus thuringiensis (Bt) crops). HT crops have simplified weed management practices, reduced crop production costs, and have had positive effects on the environment. However, there are concerns about the potential development of weeds resistant to glyphosate, the main herbicide employed with HT crops. A second major worry associated with the use of HT crops is the potential introgression of genes from GM crops into wild relatives (i.e. gene flow) and its potential...
Tipo: Journal article Palavras-chave: Bt crops; Gene flow; Genetically modified crops; Glyphosate; Golden Rice; Herbicide-tolerant crops; Transgenic crops.
Ano: 2008 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202008000300001
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Beyond Roadkill, Radiotracking, Recapture and FST—a Review of Some Genetic Methods to Improve Understanding of the Influence of Roads on Wildlife Ecology and Society
Simmons, Jody M; Monash University; Australian Centre for Biodiversity; jodymichellesimmons@yahoo.com.au; Sunnucks, Paul; Monash University; Australian Centre for Biodiversity; paul.sunnucks@sci.monash.edu.au; Taylor, Andrea C; Monash University; Australian Centre for Biodiversity; andrea.taylor@sci.monash.edu.au; van der Ree, Rodney; Australian Research Centre for Urban Ecology, Royal Botanic Gardens Melbourne; rvdr@unimelb.edu.au.
Habitat fragmentation continues to occur despite increasing evidence of its adverse effects on ecosystems. One of the major detrimental effects of roads and traffic is the creation of barriers or filters to the movement of wildlife, ultimately disconnecting some populations. Our understanding of the extent to which roads reduce the movement of biota is mostly based on field-based observational methods of inferring animal movement, and to a much smaller extent, on allele frequency-based genetic analyses. Field-based methods, as it is typically feasible to apply them, tend to be informative at fine temporal and spatial scales. Allele frequency-based genetic methods are informative at broad geographic scales but at timescales usually greater than recent...
Tipo: Peer-Reviewed Insight Palavras-chave: Barrier; Dispersal; Gene flow; Genotypic analyses; Habitat fragmentation; Road ecology.
Ano: 2010
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Biosafety Evaluation of Transgenic Potatoes: Genc Flow from Transgenic Potatoes Taiwan Agricultural Research Institute
Anthony J. Conner.
[[abstract]]A potential concern associated with the release of transgenic crops is the risk of gene flow to neighboring crops of the same species or to related species. In potato there is little accurate information or experience on effective pollination distances for gene flow between plants. The incidence of intraspecific or interspecific pollination as a basis for gene flow has only received minimal attention since true seed production is unimportant for plant propagation. Gene flow of transgenes from potato crops can arise from several different paths. The most obvious is from true seeds arising on neighboring non-genetically modified (GM) plants, either potatoes or other Solanum species, following pollen dispersal from transgenic potato crops....
Palavras-chave: Transgenic potato; GM potato; Gene flow; Hybridization; Isolation distances Ecological and Environmental Biosafety of Transgenic Plants : proceedings of international symposium [[classification]]9.
Ano: 2006
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Biosystematics of the genus Dahlstedtia Malme (Leguminosae, Papilionoideae, Millettieae) Rev. Bras. Bot.
Teixeira,Simone P.; Ranga,Neusa T..
Dahlstedtia has been considered a monotypic genus by some authors, but comprising two species according to others. The latter view was supported by our biosystematic study. The two species are Neotropical, mainly occurring in the Brazilian Atlantic Forest, where they are, however, allopatric. Experimental pollinations show that the two species are intersterile. After interspecificcrossings, few pollen tubes reach the ovule, a dense secretion fills the micropyle and no proembryos are formed. Probably, there is no gene flow between species, but if it should occur, no hybrids would be formed. The present work confirms Burkart's taxonomic view, according to which Dahlstedtia comprises at least two species: D. pinnata and D. pentaphylla.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Allopatry; Dahlstedtia pentaphylla; Dahlstedtia pinnata; Gene flow; Geographical distribution.
Ano: 2004 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042004000100005
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Combining population genomics and forward simulations to investigate stocking impacts: A case study of Muskellunge ( Esox masquinongy ) from the St. Lawrence River basin ArchiMer
Rougemont, Quentin; Carrier, Anne; Le Luyer, Jeremy; Ferchaud, Anne-laure; Farrell, John M.; Hatin, Daniel; Brodeur, Philippe; Bernatchez, Louis.
Understanding the genetic and evolutionary impacts of stocking on wild fish populations has long been of interest as negative consequences such as reduced fitness and loss of genetic diversity are commonly reported outcomes. In an attempt to sustain a fishery, managers implemented nearly five decades of extensive stocking of over a million Muskellunge (Esox masquinongy), a native species in the Lower St. Lawrence River (Québec, Canada). We investigated the effect of this stocking on population genetic structure and allelic diversity in the St. Lawrence River in addition to tributaries and several stocked inland lakes. Using Genotype‐By‐Sequencing (GBS), we genotyped 643 individuals representing 22 locations and combined this information with forward...
Tipo: Text Palavras-chave: Admixture; Esox masquinongy; Forward simulations; Gene flow; Genomic; Stocking.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00476/58791/61324.pdf
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Conservação genética de populações de Cryptocarya moschata Nees (Lauraceae) na Mata Atlântica do estado de São Paulo Rev. Bras. Bot.
MORAES,PEDRO LUÍS RODRIGUES DE; MONTEIRO,REINALDO; VENCOVSKY,ROLAND.
Através da análise de 18 locos isoenzimáticos polimórficos, foram estimadas as freqüências alélicas referentes a 214 indivíduos adultos de quatro populações naturais de Cryptocarya moschata de duas regiões do estado de São Paulo. Com base nas heterozigosidades observadas e esperadas, foram obtidas estimativas das estatísticas F de Wright. Para fins de comparação, utilizou-se também o método da análise da variância para estimação dos parâmetros correspondentes F = FIT, <FONT FACE="Symbol">q</font>P= FST e f = FIS. Os dois métodos forneceram resultados bastante concordantes: <img src="http:/img/fbpe/rbb/v22s2/f.gif" alt="f.gif (76 bytes)">IT = 0,142; <img src="http:/img/fbpe/rbb/v22s2/f.gif" alt="f.gif (76 bytes)">ST = 0,140; <img...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Genetic structure; Effective population size; Gene flow; Cryptocarya moschata.
Ano: 1999 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84041999000500004
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Contemporary pollen and seed dispersal in natural populations of Bertholletia excelsa (Bonpl.) Repositório Alice
BALDONI, A. B.; WADT, L. H. O.; CAMPOS, T.; SILVA, V. S.; AZEVEDO, V. C. R.; MATA, L. R.; BOTIN, A. A.; MENDES, N. O.; TARDIN, F. D.; TONINI, H.; HOOGERHEIDE, E. S. S.; SEBBENN, A. M..
Due to the nutritional content and commercial value of its seeds, Bertholletia excelsa is one of the most important species exploited in the Amazon region. The species is hermaphroditic, insect pollinated, and its seeds are dispersed by barochory and animals. Because the fruit set is dependent on natural pollinator activity, gene flow plays a key role in fruit production. However, to date, there have been no studies on pollen and seed flow in natural populations of B. excelsa. Herein, we used microsatellite loci and parentage analysis to investigate the spatial genetic structure (SGS), realized pollen and seed dispersal, and effective pollen dispersal for two B. excelsa populations in the Brazilian Amazon forest. Two plots were established in natural...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Conservation genetics; Genética de conservação; Genética populacional; Fluxo de genes; Árvore tropical; Endogamia; Método de melhoramento; Polinização; Dispersão de semente; Population genetics; Gene flow.
Ano: 2017 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1076089
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Dealing with Environmental Issues of GM Crops in an Isolated Place We Call Home Taiwan Agricultural Research Institute
Allis M. Wieczofek.
[[abstract]]Island populations have a much higher risk of extinction than their mainland counterparts for a number of reasons. Particular concern has been voiced that gene flow and hybridization between agricultural crops and native plant species may exacerbate their precarious position, especially if the gene flow occurs from crops developed through recombinant DNA technologies. Horizontal gene transfer (HGT) and vertical gene transfer (VGT) are the two possible ways for gene flow and introgression to occur. VGT is more likely to facilitate gene transfer between agricultural crops and native plant species, although this too is dependent on a variety of factors. In this critical review phylogenetic tribal boundaries were used as a limit to hybridization...
Palavras-chave: Gene flow; Genetically engineered; Hybridization; Introgression Ecological and Environmental Biosafety of Transgenic Plants : proceedings of international symposium [[classification]]9.
Ano: 2006
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Detección de transgenes en variedades nativas de maíz en dos regiones del estado de Puebla. Colegio de Postgraduados
Carreón Herrera, Nayelli Itzell.
La presencia de transgenes en variedades nativas de maíz mexicano ha sido motivo de controversia. Se sospecha una posible introducción a través de las tiendas rurales DICONSA (TRD). El objetivo de este estudio fue precisar si plantas provenientes del grano expendido por las TRD al sembrarse llegan a antesis, y si esta coincide con la floración femenina de los maíces nativos de municipios de la Mixteca Baja en el Estado de Puebla. También se buscó cuantificar secuencias transgénicas, particularmente el promotor del Virus Mosaico de la coliflor (CaMV, por sus siglas en inglés) -35S en variedades nativas de maíz y en granos provenientes de TRD. Para el primer objetivo, en 2008 se establecieron dos experimentos en campo evaluando 46 poblaciones nativas y 23...
Palavras-chave: Maíz transgénico; Variedades nativas; Maíces nativos; Dinámica de floración; Promotor CaMV-35S; PCR Tiempo-Real; Flujo génico; Transgenic maize; Maize landraces; CaMV-35S promoter; RT-PCR; Gene flow; Flowering dynamics; Maestría; EDAR; Estrategias para el Desarrollo Agrícola Regional.
Ano: 2011 URL: http://hdl.handle.net/10521/439
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Detección de transgenes en variedades nativas de maíz en dos regiones del estado de Puebla. Colegio de Postgraduados
Carreón Herrera, Nayelli Itzell.
La presencia de transgenes en variedades nativas de maíz mexicano ha sido motivo de controversia. Se sospecha una posible introducción a través de las tiendas rurales DICONSA (TRD). El objetivo de este estudio fue precisar si plantas provenientes del grano expendido por las TRD al sembrarse llegan a antesis, y si esta coincide con la floración femenina de los maíces nativos de municipios de la Mixteca Baja en el Estado de Puebla. También se buscó cuantificar secuencias transgénicas, particularmente el promotor del Virus Mosaico de la coliflor (CaMV, por sus siglas en inglés) -35S en variedades nativas de maíz y en granos provenientes de TRD. Para el primer objetivo, en 2008 se establecieron dos experimentos en campo evaluando 46 poblaciones nativas y 23...
Palavras-chave: Maíz transgénico; Variedades nativas; Maíces nativos; Dinámica de floración; Promotor CaMV-35S; PCR Tiempo-Real; Flujo génico; Transgenic maize; Maize landraces; CaMV-35S promoter; RT-PCR; Gene flow; Flowering dynamics; Maestría; EDAR; Estrategias para el Desarrollo Agrícola Regional.
Ano: 2011 URL: http://hdl.handle.net/10521/439
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Development and molecular characterization of herbicide resistant transgenic rice (Oryza sativa L.) and assessment of gene flow from transgenic to non-transgenic rice using gus as a reporter gene International Rice Research Institute
Kaur, Jatinder.
xvi, 133 p. : col. ill. Thesis (Ph.D.) -- University of the Philippines at Los Baños
Tipo: Thesis Palavras-chave: Rice; Genetic engineering; Molecular genetics; Herbicide resistance; Transgenic plants; Gene flow; Reporter genes.
Ano: 2002 URL: http://hdl.handle.net/123456789/434
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Development of microsatellite loci and population genetics in the bumblebee catfish species Pseudopimelodus atricaudus and Pseudopimelodus magnus (Siluriformes: Pseudopimelodidae) Neotropical Ichthyology
Rangel-Medrano,José David; Márquez,Edna Judith.
ABSTRACT The Neotropical freshwater catfish Pseudopimelodus atricaudus and Pseudopimelodus magnus are two recently discovered species endemic to the Colombian Magdalena-Cauca River basin. In this study, a set of 13 microsatellite loci were developed by using next generation sequence technology to assess the genetic diversity and population structure in P. atricaudus and test for cross-species amplification in P. magnus. Both species exhibited high genetic diversity (P. atricaudus: Na: 9.000 - 9.769 alleles/locus, Ho: 0.760 - 0.804, HE: 0.804 - 0.840; P. magnus: Na: 12.8 - 5.4 alleles/locus, Ho: 0.638 - 0.683, HE: 0.747 - 0.755) compared to the mean levels of genetic diversity reported for Neotropical Siluriformes, and lack of genetic differentiation among...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Colombia; Freshwater fish; Gene flow; Genetic diversity; Magdalena-Cauca basin.
Ano: 2021 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252021000100205
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Development of microsatellite loci and population genetics of the catfish Pimelodus yuma (Siluriformes: Pimelodidae) Neotropical Ichthyology
Joya,Cristhian Danilo; Landínez-García,Ricardo Marcel; Márquez,Edna Judith.
ABSTRACT Pimelodus yuma (formerly Pimelodus blochii) is a freshwater fish, endemic to the Colombian Magdalena-Cauca and Caribbean basins that experiences habitat disturbances resulting from anthropogenic activities. Due to the lack of information about the population genetics of this species, this study developed 14 species-specific microsatellite loci to assess the genetic diversity and population structure of samples from the lower section of the Cauca River. The studied species showed genetic diversity levels higher than the average values reported for Neotropical Siluriformes and significant inbreeding levels as was described for some congeners. Furthermore, P. yuma comprises two coexisting genetic groups that exhibit gene flow along the lower section...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Freshwater fish; Genetic diversity; Gene flow; Molecular marker; Next generation sequencing.
Ano: 2021 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252021000100209
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Dispersão de pólen em soja transgênica na região do Cerrado. Repositório Alice
ABUD, S.; SOUZA, P.I.M. de; MOREIRA, C.T.; ANDRADE, S.R.M.; ULBRICH, A.V.; VIANNA, G.R.; RECH, E.L.; ARAGÃO, F.J.L..
O objetivo deste trabalho foi avaliar a dispersão de pólen transgênico em soja. Plantas transgênicas de soja contendo os genes ahas, para tolerância ao herbicida imazapyr, e uidA (GUS), foram cultivadas com plantas não-transgênicas. A dispersão do pólen transgênico foi avaliada pela presença de ambos os genes dominantes na progênie de plantas não-transgênicas. A maior freqüência de disseminação de pólen transgênico foi observada na primeira linha, distante 0,5 m da parcela central (0,44% a 0,45%). Esta freqüência foi reduzida drasticamente na linha 2 (0,04% a 0,14%), atingindo 0 na linha 13, a 6,5 m da parcela central.
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Glycine max; Planta transgênica; Polinização; Fluxo gênico; Transgenic plants; Pollination; Gene flow.
Ano: 2003 URL: http://www.alice.cnptia.embrapa.br/handle/doc/109658
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Diversidade genética de populações de andiroba no Baixo Acre Repositório Alice
RAPOSO, A.; MARTINS, K.; CIAMPI, A.Y.; WADT, L.H. de O.; VEASEY, E.A..
O objetivo deste trabalho foi avaliar a diversidade genética em duas populações de Carapa guianensis Aubl. (andiroba), no Estado do Acre, e comparar os parâmetros de diversidade com os observados em outras populações da espécie (no Brasil: Flona Tapajós, PA, Porto Acre, AC; e na Costa Rica). Foram avaliados 77 indivíduos adultos com sete locos polimórficos de microssatélites. Observaram-se 51 alelos nas duas populações, em que o número efetivo de alelos por loco (A^ e = 3,2) foi inferior ao número médio de alelos por loco (A^ = 7,3), o que indica elevado número de alelos com baixa freqüência. Os valores estimados de f^ não diferiram de zero, o que mostra que não ocorre endogamia nas populações. A taxa de cruzamento aparente foi alta (t^a = 1,11 na...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Carapa guianensis; Marcadores microssatélites; Tamanho efetivo populacional; Conservação de recursos genéticos; Alelos raros; Fluxo gênico; Microsatellite markers; Effective population size; Genetic resources conservation; Rare alleles; Gene flow.
Ano: 2007 URL: http://www.alice.cnptia.embrapa.br/handle/doc/122809
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Diversity and genetic structure in natural populations of Hancornia speciosa var. speciosa Gomes in northeastern Brazil Rev. Bras. Frutic.
Martins,Georgia Vilela; Martins,Luiza Suely Semen; Veasey,Elizabeth Ann; Lederman,Ildo Eliezer; Silva,Edson Ferreira da.
Hancornia speciosa Gomes is a fruit tree native from Brazil that belongs to Apocinaceae family, and is popularly known as Mangabeira. Its fruits are widely consumed raw or processed as fruit jam, juices and ice creams, which have made it a target of intense exploitation. The extractive activities and intense human activity on the environment of natural occurrence of H. speciosa has caused genetic erosion in the species and little is known about the ecology or genetic structure of natural populations. The objective of this research was the evaluation of the genetic diversity and genetic structure of H. speciosa var. speciosa. The genetic variability was assessed using 11 allozyme loci with a sample of 164 individuals distributed in six natural populations...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Conservation; Gene flow; Genetic resources; Genetic variability; Isozyme; Mangabeira.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452012000400023
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Effects of Roads and Traffic on Wildlife Populations and Landscape Function: Road Ecology is Moving toward Larger Scales Ecology and Society
van der Ree, Rodney; University of Melbourne; rvdr@unimelb.edu.au; van der Grift, Edgar A.; Alterra, Wageningen UR, Netherlands; edgar.vandergrift@wur.nl; Clevenger, Anthony P.; Western Transportation Institute, Montana State University, USA; apclevenger@gmail.com.
Tipo: Peer-Reviewed Reports Palavras-chave: Animal movement; Animal-vehicle collisions; Barrier effect; Ecological threshold; Gene flow; Habitat fragmentation; Mitigation; Population viability analysis; Road ecology; Road-effect zone; Traffic mortality; Traffic noise; Traffic volume; Transportation planning.
Ano: 2011
Registros recuperados: 77
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