Consulta: subjectFacets:"Genetic differentiation"
Registros recuperados: 18
Data/hora: 10/06/2024 00:55:50

Análisis de la diversidad genética de variedades nativas de chile "Poblano" por medio de microsatélites.
Provedor de dados: 32
Autores: Contreras Toledo, Aremi Rebeca.
A partir de la domesticación de chile (Capsicum annuum L.) en México, se ha generado una gran diversidad dentro de esta especie en nuestro país, derivada de la selección de los agricultores para diferentes usos, siendo el chile Poblano uno de los más importantes y el más representativo del Estado de Puebla; sin embargo, el rendimiento de chile poblano en esta región ha presentado una reducción en los últimos años, debido, en parte, a la falta de semilla mejorada que debe ser seleccionada con base en las necesidades de los propios productores, existiendo la potencial pérdida de este germoplasma. Los objetivos de este estudio fueron estimar la diversidad genética y determinar sus posibles patrones de distribución, diferenciar grupos genéticos de variedades y...
Palavras-chave: Capsicum annuum; SSR; Polimorfismo; Diferenciación genética; Polymorphism; Genetic differentiation; Maestría; Genética.
Ano: 2011
URL: http://hdl.handle.net/10521/400

Análisis de la diversidad genética de variedades nativas de chile "Poblano" por medio de microsatélites.
Provedor de dados: 32
Autores: Contreras Toledo, Aremi Rebeca.
A partir de la domesticación de chile (Capsicum annuum L.) en México, se ha generado una gran diversidad dentro de esta especie en nuestro país, derivada de la selección de los agricultores para diferentes usos, siendo el chile Poblano uno de los más importantes y el más representativo del Estado de Puebla; sin embargo, el rendimiento de chile poblano en esta región ha presentado una reducción en los últimos años, debido, en parte, a la falta de semilla mejorada que debe ser seleccionada con base en las necesidades de los propios productores, existiendo la potencial pérdida de este germoplasma. Los objetivos de este estudio fueron estimar la diversidad genética y determinar sus posibles patrones de distribución, diferenciar grupos genéticos de variedades y...
Palavras-chave: Capsicum annuum; SSR; Polimorfismo; Diferenciación genética; Polymorphism; Genetic differentiation; Maestría; Genética.
Ano: 2011
URL: http://hdl.handle.net/10521/400

Mitochondrial genetic variability of Didelphis albiventris (Didelphimorphia, Didelphidae) in Brazilian localities
Provedor de dados: 74
Autores: Sousa,Luciene C.C.; Gontijo,Célia M.F.; Botelho,Helbert A.; Fonseca,Cleusa G.
Didelphis albiventris is a well-known and common marsupial. Due to its high adaptability, this very widespread generalist species occurs under various environmental conditions, this even including protected regions and disturbed urban areas. We studied a 653 bp fragment of cytochrome oxidase c (COI) from 93 biological samples from seven Brazilian localities, with linear distances ranging between 58 and about 1800 km to analyze the effects of geographic distances on variability and genetic differentiation. The haplotype network presented nine haplotypes and two genetic clusters compatible with the two most distant geographic areas of the states of Minas Gerais, in the southeast, and Rio Grande do Sul, in the extreme south. As each cluster was characterized...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Didelphis albiventris; Marsupial; Variability; COI; Genetic differentiation.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572012000300020

Genetic and ecological niche modeling of Calydorea crocoides (Iridaceae): an endemic species of Subtropical Highland Grasslands
Provedor de dados: 74
Autores: de Alencar,Juliana Lustosa Matos; Kaltchuk-Santos,Eliane; Fachinetto,Juliana; Tacuatiá,Luana Olinda; Forni-Martins,Eliana Regina; Stiehl-Alves,Eudes Maria; de Souza-Chies,Tatiana Teixeira.
Abstract Evolutionary analyses have been widely used for evaluation of genetic diversity of natural populations and correlate these data to the fitness of the species, especially in the case of threatened species. Calydorea crocoides occurs in a restricted area at altitudes from 800 to 1500 m in southern Brazil and is considered endangered. A study assessing genetic diversity, cytogenetic features and ecological niche was performed aiming to characterize C. crocoides by multidisciplinary approaches. Molecular data highlighted that most of the total variation (76%; p &lt; 0.001) was found within populations and the parameters of genetic diversity were high at the species level (PPB = 98.97%; I = 0.4319; h = 0.2821). Gene flow (Nm) was estimated in 0.97...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genetic differentiation; ISSR markers; Pollen viability; Cytogenetic analyses; Restricted distributed species.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572018000200327

Genetic differentiation of Macrodon ancylodon (Sciaenidae, Perciformes) populations in Atlantic coastal waters of South America as revealed by mtDNA analysis
Provedor de dados: 74
Autores: Santos,Simôni; Schneider,Horacio; Sampaio,Iracilda.
The king weakfish (pescada-gó in Portuguese - Macrodon ancylodon (Sciaenidae), a demersal (bottom-feeding) species found in South America Atlantic coastal waters from the Gulf of Paria in Venezuela to Baia Blanca in Argentina, is an economically important species because of its abundance and wide acceptance by consumers. Because of its wide distribution this fish may be subject to geographic isolation and this may have resulted in distinct populations along its coastal range. Considering that this species represents an important economic resource, confirmation of whether M. ancylodon is a single species or there are different genetic stocks spread over its wide distribution would be an important contribution to conservation policies and population...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Macrodon ancylodon; Sciaenidae; Perciformes; 16S rRNA; Cytochrome b; Genetic differentiation.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572003000200008

Variation and genetic structure of Melipona quadrifasciata Lepeletier (Hymenoptera, Apidae) populations based on ISSR pattern
Provedor de dados: 74
Autores: Nascimento,Marcília A.; Batalha-Filho,Henrique; Waldschmidt,Ana M.; Tavares,Mara G.; Campos,Lucio A.O.; Salomão,Tânia M.F.
For a study of diversity and genetic structuring in Melipona quadrifasciata, 61 colonies were collected in eight locations in the state of Minas Gerais, Brazil. By means of PCR analysis, 119 ISSR bands were obtained, 80 (68%) being polymorphic. He and H B were 0.20 and 0.16, respectively. Two large groups were obtained by the UPGMA method, one formed by individuals from Januária, Urucuia, Rio Vermelho and Caeté and the other by individuals from São João Del Rei, Barbacena, Ressaquinha and Cristiano Otoni. The Φst and θB values were 0.65 and 0.58, respectively, thereby indicating high population structuring. UPGMA grouping did not reveal genetic structuring of M. quadrifasciata in function of the tergite stripe pattern. The significant correlation between...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hymenoptera; Melipona; Genetic differentiation; ISSR markers; Population structure.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572010000200031

Genetic divergence between Melipona quadrifasciata Lepeletier (Hymenoptera, Apidae) populations
Provedor de dados: 74
Autores: Tavares,Mara Garcia; Pietrani,Nathalia Teixeira; Durvale,Maxwell de Castro; Resende,Helder Canto; Campos,Lucio Antonio de Oliveira.
Melipona quadrifasciata is a stingless bee widely found throughout the Brazilian territory, with two recognized subspecies, M. quadrifasciata anthidioides, that exhibits interrupted metasomal stripes, and M. quadrifasciata quadrifasciata, with continuous metasomal stripes. This study aimed to estimate the genetic variability of these subspecies. For this purpose, 127 colonies from 15 Brazilian localities were analyzed, using nine species-specific microsatellite primers. At these loci, the number of alleles ranged from three to 15 (mean: 7.2), and the observed heterozygosity (Ho) ranged from 0.03-0.21, while the expected heterozygosity (He) ranged from 0.23-0.47. The genetic distances among populations ranged from 0.03-0.45. The F ST multilocus value (0.23)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genetic differentiation; Microsatellites; Population genetics; Stingless bees.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572013000100016

Candidate gene variation in gilthead sea bream reveals complex spatiotemporal selection patterns between marine and lagoon habitats
Provedor de dados: 5
Autores: Guinand, B.; Chauvel, C.; Lechene, M.; Tournois, J.; Tsigenopoulos, C. S.; Darnaude, A. M.; Mckenzie, David; Gagnaire, P. A.
In marine fishes, the extent to which spatial patterns induced by selection remain stable across generations remains largely unknown. In the gilthead sea bream Sparus aurata, polymorphisms in the growth hormone (GH) and prolactin (Prl) genes can display high levels of differentiation between marine and lagoon habitats. These genotype-environment associations have been attributed to differential selection following larval settlement, but it remains unclear whether selective mortality during later juvenile stages further shapes genetic differences among habitats. We addressed this question by analysing differentiation patterns at GH and Prl markers together with a set of 21 putatively neutral microsatellite loci. We compared genetic variation of spring...
Tipo: Text
Palavras-chave: Candidate gene; Growth hormone; Prolactin; Genetic differentiation; Amplicon sequencing; Local selection.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00625/73751/74235.pdf

Natural hybridization between genetically differentiated populations of Crassostrea gigas and C-angulata highlighted by sequence variation in flanking regions of a microsatellite locus
Provedor de dados: 5
Autores: Huvet, Arnaud; Fabioux, Caroline; Mccombie, Helen; Lapegue, Sylvie; Boudry, Pierre.
The marine environment is of special interest for studying hybridization between closely related taxa because of the high dispersal potential of planktonic larvae, such as those of most bivalve species. The oysters Crassostrea angulata and C. gigas are known to be very close genetically and entirely inter-fertile under controlled conditions. However, hybridization in the wild had not been investigated, mainly due to the lack of nuclear diagnostic markers. In the present paper, we first estimated genetic differentiation between these 2 closely related taxa using 8 microsatellite markers. Interestingly, 5 markers displayed significant differences of allele size between taxa. The subsequent sequencing of alleles of one of these microsatellites showed several...
Tipo: Text
Palavras-chave: Allele size; Microsatellites; Genetic differentiation; Hybridization; Crassostrea gigas; Crassostrea angulata.
Ano: 2004
URL: http://archimer.ifremer.fr/doc/2004/publication-3355.pdf

Genetic and morphological variation in corallivorous snails (Coralliophila spp.) living on different host corals at Curaçao, southern Caribbean
Provedor de dados: 16
Autores: Potkamp, G.; Vermeij, M.J.A.; Hoeksema, B.W.
Snails of the genus Coralliophila (Muricidae: Coralliophilinae) are common corallivores in the Caribbean, feeding on a wide range of host species. In the present study, the morphological and genetic variation in C. galea and C. caribaea were studied in relation to their association with host coral species at Curaçao. Differences in shell shape among snails living on different hosts were quantified using geometric morphometric and phylogenetic relationships were studied using two mitochondrial markers (12S and COI). Based on these analyses, a new species, C. curacaoensis sp. nov., was found in association with the scleractinian coral Madracis auretenra. Both C. galea and C. caribaea showed host-specific differences in shell shape, size, and shell allometry...
Tipo: Article / Letter to the editor
Palavras-chave: Genetic differentiation; Phylogenetics; 12S; COI; Corallivory; Morphology; Geometric morphometrics; Host race.
Ano: 2017
URL: http://www.repository.naturalis.nl/record/630190

Haplotype identification within Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae) corn and rice strains from Colombia
Provedor de dados: 82
Autores: Salinas-Hernandez,H; Saldamando-Benjumea,CI.
The fall army worm Spodoptera frugiperda (Smith) is a migratory important pest of corn, sorghum, rice, grass and bermudagrass in North and South America. This species has diverged into two genetically differentiated but morphologically identical strains, "the rice" and "the corn". They have been analyzed by sequencing the genes cytochrome oxydase I, II and ITS1 from populations from the United States and Brazil. However, no such studies were performed in Colombia. In here, we identified 43 haplotypes by sequencing a fragment of the COI gene from 102 individuals, of which 40 had already been identified as the "corn" and "rice" strains or to their hybrids from Tolima, and the rest were collected from corn, cotton, sorghum, grass and rice fields in other...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genetic differentiation; Host plant; Monitoring.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2011000400002

Genetic analysis of whole mitochondrial genome of Lateolabrax maculatus (Perciformes: Moronidae) indicates the presence of two populations along the Chinese coast
Provedor de dados: 103
Autores: Gong,Jie; Chen,Baohua; Li,Bijun; Zhou,Zhixiong; Shi,Yue; Ke,Qiaozhen; Zhang,Dianchang; Xu,Peng.
ABSTRACT The whole mitochondrial genome of Lateolabrax maculatus (Cuvier, 1828) was used to investigate the reasons for the observed patterns of genetic differentiation among 12 populations in northern and southern China. The haplotype diversity and nucleotide diversity of L. maculatus were 0.998 and 0.00169, respectively. Pairwise FST values between populations ranged from 0.001 to 0.429, correlating positively with geographic distance. Genetic structure analysis and haplotype network analysis indicated that these populations were split into two groups, in agreement with geographic segregation and environment. Tajima’s D values, Fu’s Fs tests and Bayesian skyline plot (BSP) indicated that a demographic expansion event may have occurred in the history of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Adaptation; Genetic differentiation; Selection.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702020000100314

The marine brooder Excirolana braziliensis (Crustacea: Isopoda) is also a complex of cryptic species on the coast of Chile
Provedor de dados: 97
Autores: VARELA,ANDREA I; HAYE,PILAR A.
Speciation is a direct consequence of isolated populations in taxa with low dispersal potential. The brooding crustacean Excirolana braziliensis, with a presumably wide geographic range of distribution (~16° N-41° S in the Pacific and ~19° N-35° S in the Atlantic), has been detected to correspond to cryptic species on the coast of Panama. Latitudinal variations in reproductive features in E. braziliensis have been attributed to phenotypic plasticity, however, the differences may be the result of divergent populations. Considering that the taxon has been reported to be a complex of cryptic species in other geographic areas and given the phenotypic differences detected along its distribution range, we hypothesized that E. braziliensis is a complex of species...
Tipo: Journal article
Palavras-chave: Cryptic species; Genetic differentiation; Genetic distance; Marine peracarids; Phylogenetics.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2012000400011

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

Genetic diversity between native and improved Cattleya walkeriana Gardner famous clones
Provedor de dados: 1
Autores: Tambarussi, Evandro Vagner; Ann Veasey, Elizabeth; Menezes, Lou; Ibañes, Bruna; Lombardi, Kátia Cylene; Vencovsky, Roland.
The aim of this study was to evaluate the genetic diversity among native plants and some individuals obtained from crosses with unknown genealogy of C. walkeriana as well as C. loddigesii and C. nobilior and to advance towards solving the question of the genetic purity of the “Orchidglade” clone. Eight microsatellite loci were used to evaluate the genetic diversity between individuals of C. walkeriana. Microsatellites were not efficient in determining the genetic diversity between C. walkeriana groups (native and improved). The difficulty in determining the genetic distance between the different genotypes can be attributed to the complex mating system of the species and to a weak genetic barrier that facilitates the development of hybrids. Our analysis...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: 2.02.03.00-4 orchid improvement; Genetic variation; Genetic differentiation; Cattleya loddigesii; Cattleya nobilior; Melhoramento vegetal.
Ano: 2017
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/32520

Altitudinal genetic variation among Pinus patula populations from Oaxaca, México, in growth chambers simulating global warming temperatures
Provedor de dados: 115
Autores: Sáenz-Romero,Cuauhtémoc; Beaulieu,Jean; Rehfeldt,Gerald E.
Climatic change will decouple the matching between genotypes and environments. Studying the patterning of genetic variation among pine populations along altitudinal gradients under simulated climatic change temperatures, would provide insights about how to realign the present populations to future environments. Fourteen Pinus patula populations from the forests of the Native Indian Community of Ixtlán de Juárez, state of Oaxaca, México, were collected in January-March 2005 and 2006 along an altitudinal gradient (2400 m to 3050 m, one population every 50 m of altitudinal difference). Seedlings were grown in growth chambers at the Laurentides Forestry Center, Quebec city, Canada, under two temperature treatments aiming to simulate: contemporary temperature...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Altitudinal gradients; Altitudinal seed zoning; Assisted migration; Climate change; Genetic differentiation.
Ano: 2011
URL: http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S1405-31952011000300012

No differences ingenetic diversity of Cotoneaster franchetii (Rosaceae) shrubs betweennative and non-native ranges
Provedor de dados: 51
Autores: Lett,Irene; Hensen,Isabell; Hirsch,Heidi; Renison,Daniel.
It is commonly assumed that plants have more genetic diversity in their native range than in areas where they have been introduced due to founder effects. However, few studies have proven this assumption and included the comparison between non-native and native ranges. We analyzed AFLP fingerprint patterns of 149 individuals from five native (China) and five non-native (Argentina) populations of Cotoneaster franchetii, a shrub which successfully invades different habitats and forms extensive monospecific stands. We compared genetic diversity estimates and assessed genetic differentiation among populations by inspecting FST values and conducting a PCoA, an AMOVA and a Mantel test. No evidence was found for reduced genetic diversity in non-native populations...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: AFLP; Argentina; Biological invasion; China; Genetic differentiation; Multiple introductions.
Ano: 2015
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-23722015000300010

Bayesian analysis of the genetic structure of a Brazilian popcorn germplasm using data from simple sequence repeats (SSR)
Provedor de dados: 117
Autores: Saavedra,Javier; Silva,Tereza Aparecida; Mora,Freddy; Scapim,Carlos Alberto.
Several studies have confirmed that popcorn (Zea mays L. var. everta) has a narrow genetic basis, which affects the quality of breeding programs. In this study, we present a genetic characterization of 420 individuals representing 28 popcorn populations from Brazilian germplasm banks. All individuals were genotyped using 11 microsatellite markers from the Maize Genetics and Genomics Database. A Bayesian clustering approach via Monte Carlo Markov chains was performed to examine the genetic differentiation (Fst values) among different clusters. The results indicate the existence of three distinct and strongly differentiated genetic groups (K = 3). Moreover, the Fst values (calculated among clusters) were significantly different according to Bayesian credible...
Tipo: Journal article
Palavras-chave: Genetic differentiation; Microsatellite markers; Bayesian clustering; Monte Carlo Markov chains.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392013000200003