Consulta: subjectFacets:"Gene flow"
Registros recuperados: 59
Data/hora: 17/06/2024 10:00:57

Detección de transgenes en variedades nativas de maíz en dos regiones del estado de Puebla.
Provedor de dados: 32
Autores: 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

Detección de transgenes en variedades nativas de maíz en dos regiones del estado de Puebla.
Provedor de dados: 32
Autores: 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

Evolución genética de cuatro especies de Anastrepha spp. (Díptera: Tephritidae).
Provedor de dados: 32
Autores: Teodoro Pardo, Claudia Verónica de.
El objetivo de este estudio fue analizar la variabilidad genética en diferentes especies del género Anastrepha (Anastrepha ludens, A. obliqua, A. serpentina y A. striata), estudiar el flujo genético en A. ludens entre diferentes poblaciones de México y de Guatemala mediante un análisis isoenzimático, cuantificar ADN del ganglio cerebral y glándulas salivales y explorar la hibridación genómica in situ (GISH) en cada una de las especies de moscas en condiciones de laboratorio. Se analizaron los sistemas isoenzimáticos 6PGDH, IDH, ME, MDH, GPI y GOT en las cuatro especies de moscas en condiciones de laboratorio y campo, y para el flujo genético sólo cuatro sistemas fueron estudiados. Se examinaron 30 individuos (15 hembras y 15 machos) de cada población. Los...
Palavras-chave: Anastrepha; Contenido de ADN; Citometría de flujo; Electroforesis; GISH; Isoenzimas; Flujo genético; Variabilidad genética; DNA content; Flow cytometry; Electrophoresis; Isozymes; Gene flow; Genetic variability; Doctorado; Genética.
Ano: 2011
URL: http://hdl.handle.net/10521/569

Evolución genética de cuatro especies de Anastrepha spp. (Díptera: Tephritidae).
Provedor de dados: 32
Autores: Teodoro Pardo, Claudia Verónica de.
El objetivo de este estudio fue analizar la variabilidad genética en diferentes especies del género Anastrepha (Anastrepha ludens, A. obliqua, A. serpentina y A. striata), estudiar el flujo genético en A. ludens entre diferentes poblaciones de México y de Guatemala mediante un análisis isoenzimático, cuantificar ADN del ganglio cerebral y glándulas salivales y explorar la hibridación genómica in situ (GISH) en cada una de las especies de moscas en condiciones de laboratorio. Se analizaron los sistemas isoenzimáticos 6PGDH, IDH, ME, MDH, GPI y GOT en las cuatro especies de moscas en condiciones de laboratorio y campo, y para el flujo genético sólo cuatro sistemas fueron estudiados. Se examinaron 30 individuos (15 hembras y 15 machos) de cada población. Los...
Palavras-chave: Anastrepha; Contenido de ADN; Citometría de flujo; Electroforesis; GISH; Isoenzimas; Flujo genético; Variabilidad genética; DNA content; Flow cytometry; Electrophoresis; Isozymes; Gene flow; Genetic variability; Doctorado; Genética.
Ano: 2011
URL: http://hdl.handle.net/10521/569

Effects of Roads and Traffic on Wildlife Populations and Landscape Function: Road Ecology is Moving toward Larger Scales
Provedor de dados: 7
Autores: 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

Rethinking the Risk Management Process for Genetically Engineered Crop Varieties in Small-scale, Traditionally Based Agriculture
Provedor de dados: 7
Autores: Cleveland, David A; University of California, Santa Barbara; cleveland@es.ucsb.edu; Soleri, Daniela; University of California, Santa Barbara; soleri@es.ucsb.edu.
Tipo: Peer-Reviewed Reports
Palavras-chave: Agricultural biotechnology; Biological diversity; Biological invasion; Crop genetic resources; Farmer participation in risk evaluation; Gene flow; Genetic engineering; Risk analysis; Risk management process; Traditionally based agricultural systems compared with industrial agriculture systems; Transgenes; Transgenic crop varieties.
Ano: 2005

Population Genetic Aspects of Pollinator Decline
Provedor de dados: 7
Autores: Packer, Laurence; York University; bugsrus@yorku.ca; Owen, Robin; Mount Royal College and University of Calgary; rowen@mtroyal.ab.ca.
We reviewed the theory of conservation genetics, with special emphasis on the influence of haplodiploidy and other aspects of bee biology upon conservation genetic parameters. We then investigated the possibility that pollinator decline can be addressed in this way, using two meta-analytical approaches on genetic data from the Hymenoptera and the Lepidoptera. First, we compared levels of heterozygosity between the orders. As has been found previously, the haplodiploid Hymenoptera had markedly lower levels of genetic variation than the Lepidoptera. Bees had even lower levels, and bumble bees, in particular, often seemed almost monomorphic genetically. However, the statistically confounding effects of phylogeny render detailed interpretation of such data...
Tipo: Peer-Reviewed Reports
Palavras-chave: Bumble bees; Effective population size; Gene flow; Haplodiploidy; Heterozygosity; Hymenoptera; Lepidoptera; Meta-analysis; Pollinator decline; Population fragmentation; Population genetics.
Ano: 2001

Beyond Roadkill, Radiotracking, Recapture and FST&amp;#8212;a Review of Some Genetic Methods to Improve Understanding of the Influence of Roads on Wildlife
Provedor de dados: 7
Autores: 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

Insect resistance and risk assessment studies of advanced generations of basmati rice expressing two genes of Bacillus thuringiensis
Provedor de dados: 69
Autores: Rahman,Mahmood-ur; Rashid,Hamza; Shahid,Ahmad Ali; Bashir,Khurram; Husnain,Tayyab; Riazuddin,Sheikh.
Advanced generations of different transgenic lines of indica basmati rice (Basmati-370) expressing two unrelated Bt genes, cry1Ac and cry2A were evaluated for resistance to Yellow Stem Borer (YSB) and Rice Leaf Folder (RLF) under field conditions compared to control lines over three years (2003-2005). Homozygous lines were selected and analyzed for insect resistance, morphological, physiochemical properties and risk assessment studies. After artificial infestation of target insects, the transgenic plants showed significant resistance. Data were recorded in terms of dead hearts and white heads at vegetative and flowering stage respectively. Transgenic lines showed up to 100 and 96% resistance against yellow stem borer at vegetative and flowering stages,...
Tipo: Journal article
Palavras-chave: Bio-safety; Cry1Ac; Cry2A; Gene flow; Field trials; Gene pyramiding; Insect resistance.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000200008

Genetic structure of sigmodontine rodents (Cricetidae) along an altitudinal gradient of the Atlantic Rain Forest in southern Brazil
Provedor de dados: 74
Autores: Gonçalves,Gislene L.; Marinho,Jorge R.; Freitas,Thales R.O.
The population genetic structure of two sympatric species of sigmodontine rodents (Oligoryzomys nigripes and Euryoryzomys russatus) was examined for mitochondrial DNA (mtDNA) sequence haplotypes of the control region. Samples were taken from three localities in the Atlantic Rain Forest in southern Brazil, along an altitudinal gradient with different types of habitat. In both species there was no genetic structure throughout their distribution, although levels of genetic variability and gene flow were high.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Euryoryzomys russatus; Gene flow; Mismatch distribution; Oligoryzomys nigripes; Population expansion.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572009000400034

Spatial and temporal population genetic variation and structure of Nothotsuga longibracteata (Pinaceae), a relic conifer species endemic to subtropical China
Provedor de dados: 74
Autores: Qiu,Yingjun; Liu,Yifei; Kang,Ming; Yi,Guanmei; Huang,Hongwen.
Nothotsuga longibracteata, a relic and endangered conifer species endemic to subtropical China, was studied for examining the spatial-temporal population genetic variation and structure to understand the historical biogeographical processes underlying the present geographical distribution. Ten populations were sampled over the entire natural range of the species for spatial analysis, while three key populations with large population sizes and varied age structure were selected for temporal analyses using both nuclear microsatellites (nSSR) and chloroplast microsatellites (cpSSR). A recent bottleneck was detected in the natural populations of N. longibracteata. The spatial genetic analysis showed significant population genetic differentiation across its...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gene flow; Glacial refugia; Nothotsuga longibracteata; Spatial genetic structure; Temporal genetic structure.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572013000400019

Genetic structure of Brazilian wild rice (Oryza glumaepatula Steud., Poaceae) populations analyzed using microsatellite markers
Provedor de dados: 74
Autores: Karasawa,Marines M.G.; Vencovsky,Roland; Silva,Cynthia M.; Zucchi,Maria Imaculada; Oliveira,Giancarlo C.X.; Veasey,Elizabeth A.
Knowledge of the genetic structure and diversity of natural populations is important in developing strategies for in situ and ex situ conservation. We used eight microsatellite loci to estimate genetic structure and investigate within and between population genetic variation in eleven Brazilian wild rice (Oryza glumaepatula) populations. The study showed the following genetic diversity parameters: average number of 3.1 alleles per locus; 77.3% polymorphic loci; 0.091 observed heterozygosity and 0.393 gene diversity. F-statistics detected by microsatellite loci were: F ST = 0.491 (and R ST = 0.608), F IS = 0.780 and F IT = 0.888. No population was in Hardy-Weinberg equilibrium. The estimated apparent outcrossing rate (0.143) indicated a predominance of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Conservation; Gene flow; Genetic diversity; Microsatellites; Oryza glumaepatula.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572007000300017

Genetic diversity and population structure of Vriesea reitzii (Bromeliaceae), a species from the Southern Brazilian Highlands
Provedor de dados: 74
Autores: Soares,Luis Eduardo; Goetze,Márcia; Zanella,Camila M.; Bered,Fernanda.
Abstract The Southern Brazilian Highlands are composed by a mosaic of Mixed Ombrophilous Forest (MOF) and grassland formations, an interesting landscape for the study of population structure. We analyzed the genetic diversity within and among populations of the MOF-endemic bromeliad Vriesea reitzii by genotyping seven nuclear microsatellite loci in 187 individuals from six populations. We characterized levels of genetic diversity and assessed the genetic structure among populations. Vriesea reitzii populations showed high levels of genetic variation (number of alleles 28 - 43, allelic richness 3.589 - 5.531) and moderate levels of genetic differentiation (FST = 0.123, RST = 0.096). The high levels of genetic diversity may be explained by species...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mixed Ombrophilous Forest; Bromeliad; Araucaria forest; Gene flow; Conservation.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572018000200308

Testing the Rio Doce as a riverine barrier in shaping the Atlantic rainforest population divergence in the rodent Akodon cursor
Provedor de dados: 74
Autores: Colombi,Victor Hugo; Lopes,Silvia Ramira; Fagundes,Valéria.
Akodon cursor occurs in dense rainforest from northern (8º S) to southern (26º S) states along the Atlantic coast of Brazil. Previous karyological and molecular data revealed two major clades, one including northern (8-15º S) and the other southern (19-26º S) populations. The center of geographic distribution (15-20º S), which included the state of Espírito Santo, was identified as a potential vicariance region. Since river barriers are among the most discussed models in the study of Neotropical diversification, we examined whether the Rio Doce (19º S) plays an important role in shaping the population genetic divergence of A. cursor by including samples from Espírito Santo in the analysis. Our results showed that the northern-southern division region in...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Akodontini; Atlantic Forest; Cytochrome b; Gene flow; Phylogeography; Rodentia.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572010000400029

Pollen and seed flow patterns of Carapa guianensis Aublet. (Meliaceae) in two types of Amazonian forest
Provedor de dados: 74
Autores: Martins,Karina; Raposo,Andréa; Klimas,Christie A; Veasey,Elizabeth A; Kainer,Karen; Wadt,Lúcia Helena O.
Various factors affect spatial genetic structure in plant populations, including adult density and primary and secondary seed dispersal mechanisms. We evaluated pollen and seed dispersal distances and spatial genetic structure of Carapa guianensis Aublet. (Meliaceae) in occasionally inundated and terra firme forest environments that differed in tree densities and secondary seed dispersal agents. We used parentage analysis to obtain contemporary gene flow estimates and assessed the spatial genetic structure of adults and juveniles. Despite the higher density of adults (diameter at breast height ; 25 cm) and spatial aggregation in occasionally inundated forest, the average pollen dispersal distance was similar in both types of forest (195 ± 106min terra...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gene flow; Parentage analysis; Scatterhoarding; Seed dispersal; Spatial genetic structure.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572012000500017

Evidence of two lineages of the dengue vector Aedes aegypti in the Brazilian Amazon, based on mitochondrial DNA ND4 gene sequences
Provedor de dados: 74
Autores: Lima Júnior,Raimundo Sousa; Scarpassa,Vera Margarete.
Genetic variation was estimated in ten samples populations of Aedes aegypti from the Brazilian Amazon, by using a 380 bp fragment of the mitochocondrial NADH dehydrogenase subunit 4 (ND4) gene. A total of 123 individuals were analyzed, whereby 13 haplotypes were found. Mean genetic diversity was slightly high (h = 0.666 ± 0.029; π = 0.0115 ± 0.0010). Two AMOVA analyses indicated that most of the variation (~70%-72%) occurred within populations. The variation found among and between populations within the groups disclosed lower, but even so, highly significant values. F ST values were not significant in most of the comparisons, except for the samples from Pacaraima and Rio Branco. The isolation by distance (IBD) model was not significant (r = 0.2880; p =...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aedes aegypti; Dengue vector; Genetic structure; Gene flow; Brazilian Amazon; Genetic lineages.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572009000200032

Allozymic variation and differentiation in the chilean blue mussel, Mytilus chilensis, along its natural distribution
Provedor de dados: 74
Autores: 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

Population structure of Eupemphix nattereri (Amphibia, Anura, Leiuperidae) from Central Brazil
Provedor de dados: 74
Autores: Silva,Daniela de Melo e; Cruz,Aparecido Divino da; Bastos,Rogério Pereira; Reis,Raquel Loren; Telles,Mariana Pires de Campos; Diniz-Filho,José Alexandre Felizola.
This study reports on 156 specimens of the amphibian Eupemphix nattereri, a widely distributed leiuperid, obtained from 11 municipalities of central Brazil. The extent of genetic variation was quantified by determining the mean number of alleles per locus and the proportion of polymorphic loci. An analysis of molecular variance (AMOVA) was performed on the random amplified polymorphic DNA (RAPD) haplotypes. The genetic distances obtained by calculating pairwise phist among local samples were used to determine population relationships using the unweighted pair-group method (UPGMA) and non-metric multidimensional scaling (NMDS). The cophenetic correlation was calculated to confirm agreement between the genetic matrix and the unweighted pair group method with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Eupemphix nattereri; Gene flow; Population structure; RAPD markers.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572007000600022

High genetic diversity and connectivity in Colossoma macropomum in the Amazon basin revealed by microsatellite markers
Provedor de dados: 74
Autores: Fazzi-Gomes,Paola; Guerreiro,Sávio; Palheta,Glauber David Almeida; Melo,Nuno Filipe Alves Correa de; Santos,Sidney; Hamoy,Igor.
Abstract Colossoma macropomum is the second largest scaled fish of the Amazon. It is economically important for commercial fisheries and for aquaculture, but few studies have examined the diversity and genetic structure of natural populations of this species. The aim of this study was to investigate the levels of genetic variability and connectivity that exist between three natural populations of C. macropomum from the Amazon basin. In total, 247 samples were collected from the municipalities of Tefé, Manaus, and Santarém. The populations were genotyped using a panel of 12 multiplex microsatellite markers. The genetic diversity found in these populations was high and similar to other populations described in the literature. These populations showed a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tambaqui; Genetic variability; Gene flow; Genetic structure; Single sequence repeats.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572017000100142

Estimating dispersal and gene flow in the neotropical freshwater turtle Hydromedusa maximiliani (Chelidae) by combining ecological and genetic methods
Provedor de dados: 74
Autores: Souza,Franco L.; Cunha,Anderson F.; Oliveira,Marcos A.; Pereira,Gonçalo A.G.; Reis,Sérgio F. dos.
Hydromedusa maximiliani is a vulnerable neotropical freshwater turtle endemic to mountainous regions of the Atlantic rainforest in southeastern Brazil. Random amplified polymorphic DNA (RAPD) was used to estimate the gene flow and dispersal for individuals inhabiting rivers and streams within a drainage. Nine primers generated 27 scoreable bands, of which 9 (33%) were polymorphic and produced 12 RAPD phenotypes. The gene flow estimates (Nm) among turtles inhabiting different rivers and streams were variable, ranging from 0.09 to 3.00 (mean: 0.60). For some loci, the rates of gene flow could offset population differentiation (Nm &gt; 1), whereas for others random genetic drift could result in population divergence (Nm &lt; 1). Since the genetic variation of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hydromedusa maximiliani; Dispersal; Gene flow; Conservation.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572002000200007

Intraspecific variation and population structure of the Velvetbean Caterpillar, Anticarsia gemmatalis Hübner, 1818 (Insecta: Lepidoptera: Noctuidae)
Provedor de dados: 74
Autores: Sosa-Gómez,Daniel R.
The velvetbean caterpillar (VBC), Anticarsia gemmatalis Hübner, 1818 (Insecta: Lepidoptera: Noctuidae), is one of the most important New World soybean agro-ecosystems pests, occurring from 40° N in the USA to 39° S in Argentina. Information on the migration patterns of the VBC moth may be important for managing the resistance of VBC populations to insecticides or plants carrying the Bacillus thuringiensis insecticide genes, especially since sedentary populations have a higher potential to became resistant than migratory populations. We studied intraspecific variations of geographically distinct VBC populations in order to determine the genetic distance between them and to assess the variability of VBC populations from near the city of Londrina (Paraná (PR)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Molecular marker; RAPD; Gene flow; Soybean pest; Population structure.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572004000300012

Morphometric and genetic differentiation among populations of Eupemphix nattereri (Amphibia, Anura, Leiuperidae) from central Brazil
Provedor de dados: 76
Autores: Silva,Daniela de M. e; Cruz,Aparecido D. da; Bastos,Rogério P.; Telles,Mariana P. de C.; Diniz-Filho,José Alexandre F.
To assess genetic structure and phenotypic diversity of Eupemphix nattereri Steindachner, 1863, morphometric and molecular analyses were carried out for nine populations from the State of Goiás. A total of 11 morphometric traits were evaluated and genetic information was estimated using RAPD markers. Genetic and phenotypic distances were determined as a function of geographical origin. Correlation among genetic, morphometric, micro, and macroenviromental were analyzed by the Mantel test. Genetic data indicated high levels of genetic diversity (Φst= 0.3) among the nine populations. Mantel tests did not reveal a significant positive correlation between genetic and geographical distances, indicating that locally geographical populations were not genetically...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Eupemphix nattereri; Morphology; RAPD markers; Gene flow; Population structure.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212008000400013

Using neutral, selected, and hitchhiker loci to assess connectivity of marine populations in the genomic era
Provedor de dados: 5
Autores: Gagnaire, Pierre-alexandre; Broquet, Thomas; Aurelle, Didier; Viard, Frederique; Souissi, Ahmed; Bonhomme, Francois; Arnaud-haond, Sophie; Bierne, Nicolas.
Estimating the rate of exchange of individuals among populations is a central concern to evolutionary ecology and its applications to conservation and management. For instance, the efficiency of protected areas in sustaining locally endangered populations and ecosystems depends on reserve network connectivity. The population genetics theory offers a powerful framework for estimating dispersal distances and migration rates from molecular data. In the marine realm, however, decades of molecular studies have met limited success in inferring genetic connectivity, due to the frequent lack of spatial genetic structure in species exhibiting high fecundity and dispersal capabilities. This is especially true within biogeographic regions bounded by well-known...
Tipo: Text
Palavras-chave: Connectivity; Gene flow; Marine conservation; Population genomics; Population structure.
Ano: 2015
URL: http://archimer.ifremer.fr/doc/00275/38592/37120.pdf

Combining population genomics and forward simulations to investigate stocking impacts: A case study of Muskellunge (   Esox masquinongy   ) from the St. Lawrence River basin
Provedor de dados: 5
Autores: 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

Self-pollination and its implication in invasiveness of Helianthus annuus ssp. annuus AND H. Petiolaris
Provedor de dados: 46
Autores: Gutierrez,A; Rueda,F; Cantamutto,M; Poverene,M.
Helianthus petiolaris and H. annuus are exotic invaders that have spread widely in central Argentina in the last 70 years. As other annuals of the same genus, these species are outcrossers bearing a sporophytic self-incompatible mechanism. We investigated the ability to self-pollinate in plants of five accessions of each species, its influence on some reproductive traits, and compared to the cultivated sunflower, in which breeding for self-compatibility has been very successful. Plants were allowed to self-pollinate in bagged heads, manually forced to self-pollinate or allowed to cross-pollinate. Although both invasive species were confirmed as self-incompatible, some plants within most accessions were able to self-pollinate. There was no significant...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gene flow; Mating system; Seed set; Self-compatibility; Sporophytic SI.
Ano: 2014
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1852-62332014000300001

Genetic and ecological differentiation between the butterfly sisterspecies Colias alfacariensis and Colias hyale
Provedor de dados: 16
Autores: Cleary, Daniel F.R.; Descimon, Henri; Menken, Steph B.J.
Clear habitat separation between the sister species Colias alfacariensis and C. hyale is shown when occurring sympatrically. Colias hyale is found more often in moist cultivated pastures while Colias alfacariensis is more abundant in dry uncultivated habitat. Out of a total of 16 loci, no diagnostic loci were found between C. alfacariensis and C. hyale, and both species shared most major polymorphisms. Exceptions were the marked differences in allele frequencies at the HK locus and only C, hyale, but not C. alfacariensis was further invariable at the GOT2 locus, which is usually highly polymorphic in the Pieridae. Colias hyale has a significantly lower level of heterozygosity than its sister species C. alfacariensis. In Colias alfacariensis heterozygosity...
Tipo: Article / Letter to the editor
Palavras-chave: Lepidoptera; Pieridae; Allozymes; Population structure; Gene flow.
Ano: 2002
URL: http://www.repository.naturalis.nl/record/534385

Genetic and morphological differentiation in the Sakura shrimp (Sergia lucens) between Japanese and Taiwanese populations
Provedor de dados: 16
Autores: Imai, H.; Hanamura, Y.; Cheng, J.-H.
The Sakura shrimp Sergia lucens is a remarkable meso-pelagic crustacean species, which is harvested for human consumption in restricted geographical areas of Taiwan and Japan in the northwestern Pacific. Nucleotide sequence analysis of the mitochondrial DNA control region was conducted to investigate the levels of genetic variability and differentiation between Japanese and Taiwanese populations of S. lucens. The latter half of the control region, which contained 589 nucleotide sites, was sequenced using DNA extracted from 178 individuals from the two geographical regions. Analyses yielded 162 haplotypes, and the amount of genetic variability within the populations as shown by the levels of haplotype and nucleotide diversity revealed that the two...
Tipo: Article / Letter to the editor
Palavras-chave: Gene flow; Genetic diversification; Morphology; Stock identification; 42.74.
Ano: 2013
URL: http://www.repository.naturalis.nl/record/460049

Genetic differentiation, origin and dispersal of Gammarus gauthieri from the Iberian peninsula and North Africa (Crustacea, Amphipoda)
Provedor de dados: 16
Autores: 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

Flight activity of Sitophilus oryzae (L) and Sitophilus zeamais Motsch (Coleoptera: Curculionidae) and its relationship with susceptibility to insecticides
Provedor de dados: 82
Autores: Vásquez-Castro,Javier A; Baptista,Gilberto C De; Trevizan,Luiz R P; Gadanha Jr,Casimiro D.
Insect-pest mobility can influence insect susceptibility to the insecticides used to control them. The objective of this work was to evaluate the flight activity of Sitophilus oryzae (L) and Sitophilus zeamais Motsch populations reared on corn and wheat grains, and its relationship with insecticide susceptibility. Unsexed adult insects with ages between 10 and 20 days were placed on a plastic tray. A 40-watt incandescent light bulb was positioned at a 50 cm height relative to the tray. Flight activity was evaluated during 30 min. In the LC50 estimation bioassays, the insects were exposed to dry residues of the organophosphorus insecticide fenitrothion and of the pyrethroid insecticide esfenvalerate on the internal surface of glass vials. Mortality was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Stored grain; Chemical control; Tolerance; Resistance; Gene flow.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2009000300017

Genetic differentiation among Brazilian populations of Euschistus heros (Fabricius) (Heteroptera: Pentatomidae) based on RAPD analysis
Provedor de dados: 82
Autores: Sosa-Gomez,Daniel R.; Delpin,Katiaíres E.; Almeida,Alvaro M.R.; Hirose,Edson.
The Neotropical Brown Stink Bug (NBSB), Euschistus heros (Fabricius), has a wide distribution in Brazilian soybean fields, being more important in the central region of the country. The species is the main target of insecticide applications for stink bug pest control. We determined the variability among and within populations of the NBSB by random amplification of polymorphic DNA (RAPD) analysis. Samples of NBSB were collected in soybean fields from Ubiratã (PR), Londrina (PR), Centenário do Sul (PR), Cândido Mota (SP), Ponta Porã (MS) and Sapezal (MT). Genomic DNA was extracted from the head to minimize DNA contamination by endoparasites. DNA was amplified with 10 mer primers. Fifteen primers produced 246 bands. The genetic similarity matrix was obtained,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: RAPD; Molecular marker; Genetic structure; Gene flow.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2004000200009

The Environmental Effects of Genetically Modified Crops Resistant to Insects
Provedor de dados: 82
Autores: FONTES,ELIANA M.G.; PIRES,CARMEN S.S.; SUJII,EDISON R.; PANIZZI,ANTÔNIO R.
Transgenic crops are currently being cultivated on a commercial scale in many countries. The area devoted to transgenic pest resistant varieties worldwide reached 13 million hectares in 2001. These varieties offer valuable benefits but also pose potential risks. Assessments of their impact on the environment are conducted before they are approved for commercial use, as required by the regulatory biosafety frameworks. In this review, we discuss the potential ecological consequences of the commercial use in agriculture of genetically modified insect resistant crops. We also discuss the impacts caused by the change in agricultural practices, and attempt to identify gaps and possible opportunities for research, considering this new technological tool. We based...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Transgenic crop; Bt gene; Non-target organism; Gene flow; Biosafety.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2002000400001

Population genetics of the endangered catfish Pseudoplatystoma magdaleniatum (Siluriformes: Pimelodidae) based on species-specific microsatellite loci
Provedor de dados: 83
Autores: García-Castro,Kevin León; Rangel-Medrano,José David; Landínez-García,Ricardo Marcel; Márquez,Edna Judith.
ABSTRACT The Neotropical catfish genus Pseudoplatystoma comprises eight species of large size, widely distributed in South American basins. The endangered species P. magdaleniatum is endemic to Magdalena basin (Colombia), experiences high fishing pressure and its population genetics is relatively unknown. To study the genetic status and structure of P. magdaleniatum, 25 species-specific polymorphic microsatellite loci were developed using next-generation sequencing and then tested in samples collected in the Magdalena-Cauca basin. Based on 15 of these loci, P. magdaleniatum showed a high number of alleles per locus (9-10), high values of observed (0.762-0.798) and expected (0.770-0.791) heterozygosities, recent reduction of population size and gene flow....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bottleneck; Freshwater fish; Gene flow; Genetic diversity; Molecular marker.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252021000100215

Development of microsatellite loci and population genetics in the bumblebee catfish species Pseudopimelodus atricaudus and Pseudopimelodus magnus (Siluriformes: Pseudopimelodidae)
Provedor de dados: 83
Autores: 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

Development of microsatellite loci and population genetics of the catfish Pimelodus yuma (Siluriformes: Pimelodidae)
Provedor de dados: 83
Autores: 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

Spatial and temporal evolution of imidazolinone-resitant red rice in 'Clearfield' rice cultivations
Provedor de dados: 86
Autores: Kalsing,Augusto; Goulart,Ives Clayton Gomes dos Reis; Mariot,Carlos Henrique Paim; Menezes,Valmir Gaedke; Matzenbacher,Felipe de Oliveira; Merotto Junior,Aldo.
Abstract: The objective of this work was to evaluate the distribution of imidazolinone-resistant (IMI-R) red rice (Oryza sativa) populations, the frequency of alleles conferring resistance to IMI, and the adoption of agronomic practices applied to red rice control, across growing seasons and production regions of the state of Rio Grande do Sul (RS), Brazil. In the experiment, 1,008 red rice populations were screened for resistance to IMI, 760 IMI-R red rice plants were genotyped for the acetolactate synthase (ALS) alleles conferring resistance to IMI, and 40 'Clearfield' rice growers were surveyed. IMI-R red rice populations were widespread throughout RS since the 2006/2007 growing season, with a higher initial frequency in the Depressão Central and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oryza sativa; Gene flow; Herbicide resistance; Weedy rice.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2019000102503

Biosystematics of the genus Dahlstedtia Malme (Leguminosae, Papilionoideae, Millettieae)
Provedor de dados: 88
Autores: 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

Conservação genética de populações de Cryptocarya moschata Nees (Lauraceae) na Mata Atlântica do estado de São Paulo
Provedor de dados: 88
Autores: 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, &lt;FONT FACE="Symbol"&gt;q&lt;/font&gt;P= FST e f = FIS. Os dois métodos forneceram resultados bastante concordantes: &lt;img src="http:/img/fbpe/rbb/v22s2/f.gif" alt="f.gif (76 bytes)"&gt;IT = 0,142; &lt;img src="http:/img/fbpe/rbb/v22s2/f.gif" alt="f.gif (76 bytes)"&gt;ST = 0,140; &lt;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

Genetic Diversity and Phyletic Evolution of Eleven Chinese Indigenous and Three Commercial Chicken Breeds by mtDNA Sequences
Provedor de dados: 89
Autores: Yu,C; Qiu,M; Jiang,X; Zhang,Z; Du,H; Li,Q; Xia,B; Song,X; Hu,C; Xiong,X; Yang,L; Peng,H; Chen,J; Wang,Y; Yang,C.
ABSTRACT Chinese indigenous chicken breeds are geographically widespread, and a total of 116 indigenous chicken breeds are listed as Chinese national genetic resources. However, these indigenous chicken breeds are facing serious challenges as declining population and germplasm degeneration because lots of commercial chicken breeds had been introduced. In this study, the genetic variations of eleven Chinese indigenous chicken breeds of Sichuan province and three commercial chicken breeds were investigated based on the partial mitochondrial DNA D-loop of 487bp in length. 147 individuals from 14 breeds were examined and 34 haplotypes were observed. Genetic diversity analysis showed that the highest haplotype diversity level was found in Dahen Chicken (DH)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chinese chicken; Mitochondrial DNA; Cluster analysis; Gene flow; Phylogeny.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2019000400308

Genetic differentiation in populations of Aedes aegypti (Diptera, Culicidae) dengue vector from the Brazilian state of Maranhão
Provedor de dados: 92
Autores: Sousa,Andrelina Alves de; Fraga,Elmary; Sampaio,Iracilda; Schneider,Horacio; Barros,Maria Claudene.
ABSTRACT Aedes (Stegomyia) aegypti is the vector responsible for the transmission of the viruses that cause zika, yellow and chikungunya fevers, the four dengue fever serotypes (DENV - 1, 2, 3, 4), and hemorrhagic dengue fever in tropical and subtropical regions around the world. The present study investigated the genetic differentiation of the 15 populations of this vector in the Brazilian state of Maranhão, based on the mitochondrial ND4 marker. A total of 177 sequences were obtained for Aedes aegypti, with a fragment of 337 bps, 15 haplotypes, 15 polymorphics sites, haplotype diversity of h = 0.6938, and nucleotide diversity of π = 0.01486. The neutrality tests (D and Fs) were not significant. The AMOVA revealed that most of the variation (58.47%) was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gene flow; Mitochondrial DNA; ND4.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262017000100051

Diversity and genetic structure in natural populations of Hancornia speciosa var. speciosa Gomes in northeastern Brazil
Provedor de dados: 94
Autores: 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

Insecticide resistance and genetic variability in natural populations of Aedes (Stegomyia) aegypti (Diptera: Culicidae) from Colombia
Provedor de dados: 103
Autores: Aguirre-Obando,Oscar A.; Bona,Ana C. Dalla; Duque L.,Jonny E.; Navarro-Silva,Mário A.
Mosquito control prevails as the most efficient method to protect humans from the dengue virus, despite recent efforts to find a vaccine for this disease. We evaluated insecticide resistance and genetic variability in natural populations of Aedes aegypti (Linnaeus, 1762) from Colombia. This is the first Colombian study examining kdr mutations and population structure. Bioassays with larvae of three mosquito populations (Armenia, Calarcá and Montenegro) were performed according to the World Health Organization (WHO) guidelines, using Temephos. For the analysis of the Val1016Ile mutation and genetic diversity, we sampled recently-emerged adults from four mosquito populations (Armenia, Calarcá, Montenegro and Barcelona). Following the WHO protocol, bioassays...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bioassays; Gene flow; Knockdown resistance; Mitochondrial DNA; ND4 gene.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702015000100014

ความหลากหลายทางพันธุกรรมและโครงสร้างประชากรของข้าววัชพืชในประเทศไทย
Provedor de dados: 106
Autores: Anupong Wongtamee; Chanya Maneechote; Benjavan Rerkkasem; Sansanee Jamjod.
Weedy rice (Oryza sativa f. spontanea) is one of most serious weeds in direct-seeded rice production. High genetic diversity and adaptability of weedy rice made it very difficult to control in the rice field. This study aim to assess genetic diversity and population structure of weedy rice populations from Lower North, Northeast and Central of Thailand in wet of 2009 using twelve microsatellite markers. Genetic diversity and population structure of weedy rice were determined and compared with seven common wild rice populations and seven check varieties commonly grown in these regions. Weedy rice populations in this present study were hybrid between common wild rice and crop rice. The population structure of them was structured into 2 clusters according to...
Tipo: Collection
Palavras-chave: Weedy rice; Genetic diversity; Population structure; Gene flow; ข้าววัชพืช; ความหลากหลายทางพันธุกรรม; โครงสร้างประชากร; การแลกเปลี่ยนยีน; ประเทศไทย.
Ano: 2012
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5333

Geographic pattern of genetic diversity in natural populations of Rosewood (Aniba rosaeodora), in the Central Amazonia
Provedor de dados: 36
Autores: Santos,Ronaldo Pereira; Ângelo,Paula Cristina da Silva; Sampaio,Paulo de Tarso Barbosa; Quisen,Regina Caetano; Leite,Ângela Maria Conte; Oliveira,Cristiane Lopes de.
Rosewood (Aniba rosaeodora Ducke, Lauraceae) is an Amazonian evergreen tree and a source of the purest linalool, the main component of its essential oil, which is very valuable in the international perfumery market. After decades of over-exploitation it is currently considered as threatened. We evaluated the genetic diversity and its distribution in four populations in Central Amazonia. Thirty-five reliable RAPD markers were generated, of which 32 were polymorphic (91.4%). Variation was higher within the populations (76.5%; p &lt; 0.0001) and geographic distribution contributed to population differentiation (23.4%; p &lt; 0.0001). The Amazon River had a small influence on gene flow (3.3%; p &lt; 0.0001), but we identified evidence of gene flow across the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: RAPD; Linalool; Gene flow; Amazon Rainforest.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672008000300010

Genetic diversity and population structure of endangered rosewood from the Peruvian Amazon using ISSR markers
Provedor de dados: 36
Autores: GUIZADO,Stalin Juan Vasquez; NADEEM,Muhammad Azhar; ALI,Fawad; BARUT,Muzaffer; HABYARIMANA,Ephrem; GÓMEZ,Tedi Pacheco; SANTILLAN,Jhon Antoni Vargas; CANALES,Esperanza Torres; GÓMEZ,Juan Carlos Castro; CHUNG,Gyuhwa; BALOCH,Faheem Shehzad.
ABSTRACT Rosewood, Aniba rosaeodora is an endangered species in Amazon forests and its natural stands have been heavily depleted due to over-exploitation for the cosmetic industry. This study aimed to investigate the genetic diversity and population structure of 90 rosewood accessions from eight localities in the Peruvian Amazon through 11 Inter Simple Sequence Repeats (ISSR) primers. The ISSR primers produced a sum of 378 bands, of which 375 (99.2%) were polymorphic, with an average polymorphism information content (PIC) value of 0.774. The mean effective number of alleles (Ne), Shannon informative index (I), gene diversity (He) and total gene diversity (Ht) were 1.485, 0.294, 0.453 and 0.252, respectively. Analysis of molecular variance (AMOVA) showed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aniba rosaeodora; Endangered species; Gene flow; Germplasm; Molecular characterization.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672020000300204

Genetic diversity in rosewood saplings (Aniba rosaeodora ducke, Lauraceae): an ecological approach
Provedor de dados: 36
Autores: Santos,Ronaldo Pereira; Spironello,Wilson Roberto; Sampaio,Paulo de Tarso Barbosa.
This article takes an ecological approach to the genetic diversity of Rosewood (Aniba rosaeodora Ducke) in a central Amazonian terra firme forest north of Manaus. Planted Rosewood setting, under partial shaded canopy, were assessed in terms of fruiting production, frugivory, and seed dispersal. Using RAPD molecular analysis procedures, the influence of the spatial distribution of adult trees on the genetic diversity (polymorphism) of saplings was assessed with genetic samples from 34 reproductive trees and 60 saplings. The density and distribution patterns the reproductive trees did not modify the sapling"s diversity (1.86%, AMOVA). Two types of adult tree dispersion were identified; i) clumped and ii) more widely dispersed. Polymorphism (77.5%) and gene...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazonian tree; RAPD; Seed dispersal; Gene flow; Genetic diversity.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672008000400014

Pollen and seed dispersal of Brazil nut trees in the southwestern Brazilian Amazon
Provedor de dados: 36
Autores: MARTINS,Karina; SANTOS,Raifanny da Silva Oliveira dos; CAMPOS,Tatiana de; WADT,Lúcia Helena de Oliveira.
ABSTRACT Pollen and seed dispersal patterns greatly influence the spatial distribution of plant genetic diversity. Microsatellite-based parentage analysis provides accurate estimates of contemporary gene dispersal. Although most tropical trees have been shown to exhibit widespread pollen dispersal, few studies have estimated contemporary gene dispersal after seedling establishment. Bertholletia excelsa (Lecythidaceae) is pollinated by large-bodied bees, while previous seed-tracking experiments suggest their seeds are mainly dispersed across very short distances by scatter-hoarding rodents, who primarily act as seed predators. Here we used parentage analysis to provide contemporary estimates of pollen and seed dispersal in B. excelsa recruits. We examined...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bertholletia excelsa; Gene flow; Genetic diversity; Pollen flow; Seed flow.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672018000300217

SYSTEMATIC CONSIDERATIONS ON TWO SPECIES OF NECTARIVOROUS BATS (Anoura caudifer AND A. geoffroyi) BASED ON BARCODING SEQUENCES
Provedor de dados: 37
Autores: VARGAS-ARBOLEDA,Andrés; CUADRADO-RÍOS,Sebastian; MANTILLA-MELUK,Hugo.
ABSTRACT As a product of recent revisions of the nectivore bat genus Anoura (Glossophaginae: Anourina), new species have been described, and several taxa have been elevated to the specific level in the so-called Anoura caudifer and A. geoffroyi species complexes in the last four decades. The genus has a wide distribution across regions of high ecological complexity, including geographic features, such as the Andes and the Isthmus of Panamá, previously identified as natural barriers that restrict gene flow in other phyllostomid bat genera. Up to date, no analyses have been conducted to investigate the contribution of biogeographic factors on the genetic divergence of the genus. In this work, we analyze barcoding DNA sequences (cytochrome oxidase subunit I,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ecuadorian pacific; Gene flow; Genetic diversity; Tailless bat.
Ano: 2020
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2020000200194

Genetic diversity in Calibrachoa pygmaea (Solanaceae): A hawkmoth-pollinated nightshade from the Pampas
Provedor de dados: 39
Autores: Mäder,Geraldo; Backes,Alice; Reck-Kortmann,Maikel; Freitas,Loreta B.
ABSTRACT Calibrachoa pygmaea is a unique species of Calibrachoa, especially concerning its flower morphology and the environment where it occurs. The species is self-incompatible and is narrowly distributed in wet and flooded fields of the Pampas region. We characterize the genetic diversity of the species based on traditional plastid markers and newly developed nuclear microsatellites to identify drivers that guide its evolution. Our results identified markers that are informative and useful for studying the population structure of C. pygmaea, as well as that of other species of Calibrachoa. Both marker sets were congruent in developing conclusions regarding the evolutionary scenario of C. pygmaea, and revealed that the genetic variability and population...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cross-amplification; Gene flow; Genetic diversity; Plastid haplotypes; Population genetics; SSR markers; Wild petunias.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062019000400664

Genetic structure of Dicksonia sellowiana Hook. (Dicksoniaceae) reveals clinal distribution along the latitudinal gradient of the Atlantic Forest
Provedor de dados: 39
Autores: Fagundes,Bruna Saviatto; Poersch,Maria Augusta; Santos,Jaqueline dos; Gaglioti,André Luiz; Labiak,Paulo Henrique; Muschner,Valeria Cunha.
ABSTRACT Dicksonia sellowiana is the only species of the genus occurring in Brazil. Its distribution is restricted to humid areas of the Atlantic Forest biome. The distribution pattern of biodiversity in this biome is known to have been influenced by historical and environmental factors, although the pattern for ferns remains unknown. This study is first to describe the genetic structure of D. sellowiana along the latitudinal gradient of the Atlantic Forest biome. We use microsatellite markers to estimate genetic diversity and structure for 267 individuals representing 14 populations of D. sellowiana from the Atlantic Forest. The results (Ho, He, Fst, Fis, distance genetic) support the hypothesis of a pattern of biodiversity discontinuity. We found greater...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Conservation; Neotropics; Gene flow; Genetic diversity; Microsatellites; Tree fern.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062020000400712

Allelic diversity in populations of Solanum lycocarpum A. St.-Hil (Solanaceae) in a protected area and a disturbed environment
Provedor de dados: 39
Autores: 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

Evidence of genetic differentiation and karyotype evolution of the sedges Cyperus ligularis L. and C. odoratus L. (Cyperaceae)
Provedor de dados: 39
Autores: Cruz,Geyner Alves dos Santos; Vasconcelos,Santelmo; Pinangé,Diego Sotero de Barros; Gonçalves-Oliveira,Rodrigo Cesar; Alves,Marccus Vinícius; Torres,Rodrigo Augusto; Benko-Iseppon,Ana Maria.
ABSTRACT The taxonomy of Cyperaceae is complex, with genera like Cyperus harboring species complexes. We analyzed the genetic similarity between Cyperus ligularis L. and C. odoratus L. based on DNA fingerprinting and cytogenetics. Significative genetic differentiation (G ST = 0.363) and low gene flow (N  m = 0.877) indicated a clear genetic distinction between the two species. Moreover, the clustering analysis showed two distinct genetic groups, suggesting a lack of evidence for hybridization. The phenogram revealed two different lineages, and although all individuals of C. odoratus were collected from plots close to each other, they possessed greater genetic diversity than that observed among individuals of C. ligularis, which were sampled over a wider...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Agmatoploidy; DNA amplification fingerprinting; Gene flow; Genetic differentiation; Hybridization.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062018000200264

Population genetic structure of the sheath blight pathogen Rhizoctonia solani AG-1 IA from rice fields in China, Japan and the Philippines
Provedor de dados: 1
Autores: Cumagun, Christian Joseph Rili; McDonald, Bruce Alan; Arakawa, Masao; Castroagudín, Vanina Lilian; Sebbenn, Alexandre Magno; Ceresini, Paulo Cezar.
Sheath blight, caused by the fungal pathogen Rhizoctonia solani AG-1 IA is one of the most important rice diseases worldwide. The objetives of this study was to determine the predominant reproductive system and the genetic structure of 18 rice-infecting populations of R. solani sampled from China, Japan and the Philippines, the most important rice production countries in Asia. Knowledge about the population genetic structure of the pathogen in Asia is useful in identifying sources of infection and formulating sustainable management strategies for rice sheath blight. From a total of 717 isolates, 423 unique multilocus genotypes were detected based on nine microsatellite loci. The three country populations of R. solani AG-1 IA exhibited a mixed reproductive...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Thanatephorus cucumeris; Microsatellite genotyping; Reproductive system; Gene flow; Migration.
Ano: 2019
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/42457

Genetic diversity of the sunflower caterpillar (Chlosyne lacinia saundersii Doubleday and Hewitson) (Lepidoptera: Nymphalidae) populations determined by molecular RAPD markers
Provedor de dados: 42
Autores: Cunha,Fabiane; Gómez,Daniel R. Sosa; Silva,Jose J. da; Alexandre,Talita M.; Moscardi,Flávio.
Chlosyne lacinia saundersii is one of the most important pests of sunflower and it is the main target of insecticides applications. Larvae were collected in Londrina (PR), Santa Maria (RS), Dourados (MS), Ribeirão Preto (SP), Brasília (DF), Barreiras (BA), Uberaba (MG) and Vilhena (RO). Genomic DNA was extracted and amplified with ten-mer primers, which produced 101 loci. The size of the RAPD amplicons ranged from 180 to 2564 bp. Polymorphism among populations ranged from 31% to 67%, with the highest polymorphisms of 57% and 67% being detected in Uberaba and Vilhena populations, respectively. Populations with the highest similarity determined with Dice coefficient were from Ribeirão Preto and Barreiras, while insects from Londrina showed the highest...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amova; Gene flow; Molecular marker; Sunflower pest.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000400029

Honey Bees of Santa Catarina, Brazil, have only African mitochondrial DNA
Provedor de dados: 45
Autores: Lopes-da-Silva,M.; Dalbó,M.A.; Schfaschek,T.P.; Arioli,C.J.; Stefaniak,L.C.
As diferenças entre a subspécie de abelha africana (Apis mellifera scutellata) e as subspécies europeias (Apis mellifera mellifera e Apis mellifera ligustica) nos quesitos comportamento higiênico e agressividade são marcantes. Diferenças acentuadas no comportamento higiênico entre colônias de abelhas foram relatadas em Santa Catarina, Brasil. Suspeitou-se que essas diferenças fossem devidas a um possível fluxo gênico entre as abelhas africanizadas brasileiras e as abelhas europeias da Argentina. Amostras de abelhas de 30 localidades de Santa Catarina foram analisadas por meio do uso de um marcador PCR-RFLP do DNA mitocondrial específico para identificação da origem da linhagem maternal. Os resultados indicaram ausência de linhagem materna de origem...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hymenoptera; Gene flow; Maternal lineage.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352012000200039

The pioneering use of ISSR (Inter Simple Sequence Repeat) in Neotropical anurans: preliminary assessment of genetic diversity in populations of Physalaemus cuvieri (Amphibia, Leiuperidae)
Provedor de dados: 48
Autores: Moresco,Rafaela M; Maniglia,Thiago C; De Oliveira,Classius; Margarido,Vladimir P.
The greatest diversity of anurans in the world is in Brazil and one of the major challenges is to reconcile the accelerated economic development with strategies that aim to maintain this diversity in forest fragments, often representing ESUs of some biomes. This study aimed to obtain data that will support conservation projects through the pioneering use of ISSR analysis in Neotropical anurans, estimating the intra- and interpopulation genetic diversity of four populations of P. cuvieri (Paraná and São Paulo regions). Of the 65 loci scored 58 were polymorphic, with 0.797 intrapopulation variation and 0.203 interpopulation variation. The index of interpopulation genetic differentiation (Fst) proved to be high among the population of Marmeleiro-PR and the...
Tipo: Journal article
Palavras-chave: ESU; Gene flow; Genetic structure; Molecular marker.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602013000100008

Genetic structure of the ornamental tetra fish species Piabucus melanostomus Holmberg, 1891 (CHARACIDAE, IGUANODECTINAE) in the Brazilian Pantanal wetlands inferred by mitochondrial DNA sequences
Provedor de dados: 49
Autores: Borba,Rafael Splendore de; Silva,Edson Lourenço da; Ponzetto,Josi Margarete; Pozzobon,Allan Pierre Bonetti; Centofante,Liano; Alves,Anderson Luis; Parise-Maltempi,Patrícia Pasquali.
The subfamily Iguanodectinae comprises a group of small Neotropical fishes composed by two genera and 11 nominal species widely distributed in the Atlantic drainages of South America. Piabucus is the only genus of Iguanodectinae found in the Paraguay River basin, especially in the Pantanal of Mato Grosso State, where it is represented by Piabucus melanostomus. Given the wide distribution and the low dispersion capacity of this species, due the ecological constraints, it is possible that many interesting genetic features could be found in different populations. In this way, the aim of his work was to perform the phylogeographic pattern of P. melanostomus populations using mitochondrial DNA sequences. A total of 13 individuals from three rivers belonging the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Flood pulse; Genetic diversity; Gene flow; Haplotypes.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032013000100004

Frequency of CCR5delta32 in Brazilian populations
Provedor de dados: 56
Autores: Vargas,A.E.; Marrero,A.R.; Salzano,F.M.; Bortolini,M.C.; Chies,J.A.B.
A sample of 103 randomly chosen healthy individuals from Alegrete, RS, Brazil, was tested for the CCR5delta32 allele, which is known to influence susceptibility to HIV-1 infection. The CCR5delta32 allele was identified by PCR amplification using specific primers flanking the region of deletion, followed by electrophoresis on a 3% agarose gel. The data obtained were compared to those reported for other populations and interpreted in terms of Brazilian history. The individuals studied came from a highly admixed population. Most of them were identified as white (N = 59), while blacks and browns (mulattoes) were N = 13 and N = 31, respectively. The observed frequencies, considering the white, black and brown samples (6.8, 3.8, and 6.4%, respectively), suggest...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: CCR5; Chemokine receptors; Brazilian population; Gene flow.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2006000300002

Genetic Variability of the Tomato Leaf Miner (Tuta absoluta Meirick; Lepidoptera: Gelechiidae), in Tunisia, Inferred from RAPD-PCR
Provedor de dados: 117
Autores: Bettaibi,Asma; Mezghani-Khemakhem,Maha; Bouktila,Dhia; Makni,Hanem; Makni,Mohamed.
The tomato leaf miner Tuta absoluta Meyrick has invaded tomato (Solanum lycopersicum L.) crop in Tunisia since 2008 and is representing today a major threat to the production of this crop. In this study, we used the Randomly Amplified Polymorphic DNA-Polymerase Chain Reaction (RAPD-PCR) technology to assess the genetic variability within and among seven populations of T. absoluta, collected on tomato from different regions in Tunisia. Using five RAPD-PCR primers and 108 individuals, 140 polymorphic fragments were recorded. From 335 different RAPD phenotypes generated, 71 were redundant and 264 unique to a specific population. The genetic structure of T. absoluta was investigated using analysis of molecular variance (AMOVA), genetic distances (Fst) and...
Tipo: Journal article
Palavras-chave: Invasive species; Molecular markers; Insect populations; Gene flow.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392012000200008

An update on genetically modified crops
Provedor de dados: 118
Autores: 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