Consulta: subjectFacets:"Genetic distance"
Registros recuperados: 29
Data/hora: 16/06/2024 15:18:28

Diversidad genética, estructura genética y sistema de cruzamiento en Pinus johannis.
Provedor de dados: 32
Autores: García Gómez, Verónica.
Pinus johannis M. F. Robert es una especie endémica de México que se distribuye en poblaciones aisladas en la sierra Madre Oriental. Los objetivos del presente estudio fueron: a) conocer el nivel de diversidad genética y estructura genética de P. johannis; y b) estimar su tasa de cruzamiento. Se utilizaron 143 árboles en cuatro poblaciones de Pinus johannis para estimar los parámetros de diversidad genética tales como número promedio de alelos por locus, porcentaje de loci polimórficos, heterocigosidad observada y esperada. Para calcular la tasa de cruzamiento (t) se utilizó tejido de semilla de 127 árboles. Para conocer la diversidad genética se analizaron nueve sistemas enzimáticos en geles de almidón utilizando electroforesis, y tres para el sistema de...
Palavras-chave: Heterocigosidad; Índice de fijación; Distancia genética; Tasa de cruzamiento; Autofecundación; Heterozygosity; Fixation index; Genetic distance; Outcrossing rate; Selfing.
Ano: 2013
URL: http://hdl.handle.net/10521/2377

Heterozygosity following half-sib recurrent selection in popcorn using isoenzyme markers
Provedor de dados: 69
Autores: Pereira,Liz Kazmirczak; Scapim,Carlos Alberto; Mangolin,Claudete Aparecida; Machado,Maria de Fátima Pires da Silva; Pacheco,Cleso Antônio Patto; Mora,Freddy.
Isozyme biochemical marker may be useful tool for genomic analysis of maize populations undergoing recurrent selection. Thus, isozymes markers was utilized for assess the changes in the genetic variability and distance in a Brazilian composite population of popcorn following four cycles of recurrent selection for yield. One hundred and ninety-six half-sib families were evaluated from each cycle and the ten highest-yielding families (5.2%) were recombined to produce the next cycle. Isozyme analysis considered 80 seedlings per cycle. Simple linear regression equations were estimated among the allele frequencies in each locus in function of the selection cycles, the genetic distances among the cycles and the average heterozygosity per locus for each cycle....
Tipo: Journal article
Palavras-chave: Allozymes frequency; Genetic distance; Selection cycles; Zea mays.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000100004

Molecular marker heterozygosities and genetic distances as correlates of production traits in F1 bovine crosses
Provedor de dados: 74
Autores: Tambasco-Talhari,Daniella; Alencar,Maurício Mello de; Paz,Cláudia Cristina Paro de; Cruz,Geraldo Maria da; Rodrigues,Armando de Andrade; Packer,Irineu Umberto; Coutinho,Luiz Lehmann; Regitano,Luciana Correia de Almeida.
Several studies have investigated the relationship between heterozygosity, genetic distance and production traits. The objective of the present study was to evaluate the influence of the degree of heterozygosity and genetic distance on growth, carcass and reproductive related features in F1 bovine crosses. We tested 10 polymorphic markers in 330 purebred cattle (Nelore, Canchim, Aberdeen Angus and Simental) and 256 crossbred cattle belonging to four crossbred groups. Individual heterozygosities (Hi) and multilocus genetic similarity (Dm) were estimated and used in correlation analysis against individual phenotypic measurements. Significant (p &lt; 0.05) Hi effects occurred for birth weight, 15 to 18 month weight, hot carcass weight and longissimus rib eye...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bovine crosses; Molecular markers; Heterozygosity; Genetic distance; Production traits.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572005000200007

Skewed RAPD markers in linkage maps of Citrus
Provedor de dados: 74
Autores: Oliveira,Roberto Pedroso de; Aguilar-Vildoso,Carlos Ivan; Cristofani,Mariângela; Machado,Marcos Antônio.
The objective of this work was to analyze the effects of RAPD markers with skewed segregation on genetic linkage maps. Segregation data for 123 Citrus sinensis (L.) Osbeck cv. Pêra markers and 53 C. reticulata Blanco cv. Cravo markers in F1 progeny composed of 94 hybrids were used. Genetic linkage maps of the two varieties were constructed with non-skewed markers (p &lt; 0.05 and p &lt; 0.01) using the program MAPMAKER 3.0 and a pseudo-testcross strategy. The maps were compared to those constructed with all markers. Alterations in the genetic distances were observed based on the location of the skewed markers within the linkage groups. Generally, the skewed markers were located at the end of the linkage groups, sometimes forming entire linkage groups,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genetic distance; Mendelian segregation; Molecular markers; Segregation distortion.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572004000300021

Biochemical comparison of two Hypostomus populations (Siluriformes, Loricariidae) from the Atlântico Stream of the upper Paraná River basin, Brazil
Provedor de dados: 74
Autores: Ito,Kennya F.; Renesto,Erasmo; Zawadzki,Cláudio H.
Two syntopic morphotypes of the genus Hypostomus - H. nigromaculatus and H. cf. nigromaculatus (Atlântico Stream, Paraná State) - were compared through the allozyme electrophoresis technique. Twelve enzymatic systems (AAT, ADH, EST, GCDH, G3PDH, GPI, IDH, LDH, MDH, ME, PGM and SOD) were analyzed, attributing the score of 20 loci, with a total of 30 alleles. Six loci were diagnostic (Aat-2, Gcdh-1, Gpi-A, Idh-1, Ldh-A and Mdh-A), indicating the presence of interjacent reproductive isolation. The occurrence of few polymorphic loci acknowledge two morphotypes, with heterozygosity values He = 0.0291 for H. nigromaculatus and He = 0.0346 for H. cf. nigromaculatus. F IS statistics demonstrated fixation of the alleles in the two morphotypes. Genetic identity (I)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allozymes; Hypostomus nigromaculatus; Fish genetics; Genetic distance; Polymorphism.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572009000100008

Genetic diversity between herds of Alpine and Saanen dairy goats and the naturalized Brazilian Moxotó breed
Provedor de dados: 74
Autores: Araújo,Adriana Mello de; Guimarães,Simone Eliza Facioni; Machado,Thea Mírian Medeiros; Lopes,Paulo Sávio; Pereira,Carmen Silva; Silva,Francisco Luiz Ribeiro da; Rodrigues,Marcelo Teixeira; Columbiano,Virgínia de Souza; Fonseca,Cleusa Graça da.
Brazilian naturalized goat breeds are adapted to the semiarid conditions prevalent in the Northeast region of the country (which has the largest Brazilian goat heard) and represent an as yet uninvestigated source of genetic diversity. Currently, imported goat breeds are crossed with Brazilian naturalized goat breeds, endangering the genetic potential of the naturalized breeds. We used 11 microsatellite markers to determine the genetic diversity among imported (non-naturalized) dairy Alpine and Saanen goats and naturalized Brazilian Moxotó goats. We genotyped 292 goats from three herds (one private, one from the University of Minas Gerais and the Moxotó conservation herd from Embrapa Caprinos) and found that the general heterozygosity was 0.6952 for Alpine,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Conservation; DNA microsatellite; Genetic distance; Genetic diversity; Goats.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572006000100014

Structure and genetic relationships between Brazilian naturalized and exotic purebred goat domestic goat (Capra hircus) breeds based on microsatellites
Provedor de dados: 74
Autores: Oliveira,Joelliton Domingos de; Igarashi,Maria Luiza Silveira de Paiva; Machado,Théa Mírian Medeiros; Miretti,Marcos Mateo; Ferro,Jesus Aparecido; Contel,Eucleia Primo Betioli.
The genetic relationships and structure of fourteen goat (Capra hircus) populations were estimated based on genotyping data from 14 goat populations (n = 410 goats) at 13 microsatellite loci. We used analysis of molecular variance (AMOVA), principal component analysis (PCA) and F statistics (F IS, F IT and F ST) to evaluate the genetic diversity (Ho, He and ad) of the goats. Genetic distances between the 14 goat populations were calculated from allelic frequency data for the 13 microsatellite markers. Moderate differentiation was observed for the populations of the undefined breeds (including the Anglo-Nubian-M breed), the naturalized Brazilian breeds (Moxotó, Canindé), the exotic purebred breeds (Alpine, Saanen, Toggenbourg and Anglo-Nubian) and the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Goat; Microsatellite; Genetic distance; PCA; AMOVA; Genetic relationships; Genetic diversity; F statistics.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572007000300010

Allozyme comparison of two populations of Rineloricaria (Siluriformes, Loricariidae) from the Ivaí River, upper Paraná River basin, Brazil
Provedor de dados: 74
Autores: Limeira,Daniel M.; Renesto,Erasmo; Zawadzki,Cláudio H.
Two allopatric morphotypes of the genus Rinelocaria were compared through the allozyme electrophoresis technique: one morphotype, R. pentamaculata, from the Keller River in the middle stretch of the Ivaí River basin and the other, R. aff. pentamaculata, from the São João River in the upper portion of the Ivaí River basin. The morphotype from the São João River was collected upstream from the São João waterfall, which is about 80 m deep. Twelve enzymatic systems (AAT, ADH, EST, GCDH, G3PDH, GPI, IDH, LDH, MDH, ME, PGM and SOD) were analyzed, which allowed to score 22 loci. Only loci Aat-2, Est-3 and Mdh-C showed polymorphism. The two samples differed in allele frequencies at the three polymorphic loci. The average expected heterozygosity for all loci was...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Allozymes; Fish genetics; Genetic distance; Polymorphism; Loricariidae; Pisces.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572009000200034

Predicting performance of soybean populations using genetic distances estimated with RAPD markers
Provedor de dados: 74
Autores: Barroso,Paulo Augusto Vianna; Geraldi,Isaias Olívio; Vieira,Maria Lúcia Carneiro; Pulcinelli,Carlos Eduardo; Vencovsky,Roland; Dias,Carlos Tadeu dos Santos.
In order to verify whether genetic distance (GD) is associated with population mean (PM), genetic variance (GV) and the proportion of superior progenies generated by each cross in advanced generations of selfing (PS), the genetic distances between eight soybean lines (five adapted and three non-adapted) were estimated using 213 polymorphic RAPD markers. The genetic distances were partitioned according to Griffing's Model I Method 4 for diallel analysis, i.e., GDij = GD+ GGDi+ GGDj + SGDij. Phenotypic data were recorded for seed yield and plant height for 25 out of 28 populations of a diallel set derived from the eight soybean lines and evaluated from F2:8 to F2:11 generations. No significant correlation for seed yield was detected between GD and GV, while...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soybean; Genetic distance; Molecular markers; RAPD; Prediction.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572003000300020

Short-tandem repeat analysis in seven Chinese regional populations
Provedor de dados: 74
Autores: Song,Xing-bo; Zhou,Yi; Ying,Bin-wu; Wang,Lan-lan; Li,Yi-song; Liu,Jian-feng; Bai,Xiao-gang; Zhang,Lei; Lu,Xiao-jun; Wang,Jun; Ye,Yuan-xin.
In the present study, we investigated the application of 13 short tandem repeat (STR) loci (D13S317, D7S820, TH01, D16S539, CSFIPO, VWA, D8S1179, TPOX, FGA, D3S1358, D21S11, D18S51 and D5S818) routinely used in forensic analysis, for delineating population relationships among seven human populations representing the two major geographic groups, namely the southern and northern Chinese. The resulting single topology revealed pronounced geographic and population partitioning, consistent with the differences in geographic location, languages and eating habits. These findings suggest that forensic STR loci might be particularly powerful tools in providing the necessary fine resolution for reconstructing recent human evolutionary history.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Forensic medicine; Population genetics; Short-tandem repeat; Human evolutionary history; Genetic distance.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572010000400002

Variabilidade genética do banco ativo de germoplasma de mandioca do Cerrado acessada por meio de descritores morfológicos.
Provedor de dados: 14
Autores: VIEIRA, E. A.; FIALHO, J. de F.; SILVA, M. S.; FALEIRO, F. G.
RESUMO: Por reunirem constituições genéticas de diferentes origens e níveis de melhoramento, os bancos de germoplasma podem constituir-se em ótimas fontes de genes para programas de melhoramento. Para tanto, é fundamental que o melhorista conheça profundamente o germoplasma disponível em relação à variabilidade e ao seu desempenho agronômico. O objetivo deste estudo foi estimar a variabilidade genética de 356 acessos do banco de germoplasma de mandioca da Embrapa Cerrados em relação a 27 descritores morfológicos, estabelecer quais desses evidenciam maior entropia e agrupar os acessos em função da sua dissimilaridade genética. No ano de 2004, 356 acessos de mandioca foram caracterizados por meio de 27 descritores morfológicos. Com base nos dados aferidos,...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Distância genética; Entropia; Manihot escultenta; Entrophy.; Germoplasma; Mandioca; Melhoramento Genético Vegetal; Recurso Genético.; Germplasm; Genetic distance; Genetic resources; Plant breeding.
Ano: 2007
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/572262

Morphometric and allozymic characterization of Necromys benefactus populations in central Argentina
Provedor de dados: 81
Autores: Provensal,María C.; Calderón,Gladys E.; Chiappero,Marina B.; Gardenal,Cristina N.; Polop,Jaime J.; Sabattini,Marta S.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genetic distance; Morphometric variation; Oliveros virus; Pampa virus.
Ano: 2005
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-93832005000200016

Genetics and morphology of the genus Tritetrabdella (Hirudinea, Haemadipsidae) from the mountainous rain forests of Sabah, Borneo, reveal a new species with two new subspecies
Provedor de dados: 16
Autores: Kappes, H.
Blood-feeding terrestrial leeches of the family Haemadipsidae are a notorious part of the invertebrate diversity in Asian and Australian rain forests. All hitherto published records of terrestrial leeches of Borneo belong to the genus Haemadipsa. Here, a second, poorly known haemadipsid genus is reported from Mount Kinabalu and Crocker Range National Park. The individuals were barcoded and compared to sequences available in GenBank. The results show that the genus Tritetrabdella has representatives in the Indochinese and the Sundaic bioregions. All six specimens from Borneo are from a single new Tritetrabdella lineage, T. kinabaluensis spec. nov. Within the Bornean lineage, two groups differing 4-5% in the COI barcoding sequence were identified. Because 1)...
Tipo: Article / Letter to the editor
Palavras-chave: Annelida; Clitellata; Ecological specialization; Genetic distance; Parasite; Phylogeny; Speciation; Tropical mountains; 42.76; 42.64.
Ano: 2013
URL: http://www.repository.naturalis.nl/record/462900

Genetic variability of the Amazon River prawn Macrobrachium amazonicum (Decapoda, Caridea, Palaemonidae)
Provedor de dados: 16
Autores: Vergamini, F.G.; Pileggi, L.G.; Mantelatto, F.L.
The freshwater prawn Macrobrachium amazonicum is widely distributed in South America, and occupies habitats with a wide range of salinities. Several investigations have revealed the existence of wide intraspecific variability among different populations, although the understanding of this variability is still fragmentary and incomplete. We compared and characterized inland and coastal populations of M. amazonicum from Brazil, using molecular data (16S and COI mtDNA) to describe the degree of variability, structure, and relationships among them. Genetic divergence rates among populations showed variability at the intraspecific level. All the analyses evidenced significant genetic divergence among populations, structuring them in three groups: I- inland...
Tipo: Article / Letter to the editor
Palavras-chave: Brazil; Genetic distance; Inland versus coastal populations; Phylogeny; Mitochondrial DNA; Population; 42.74.
Ano: 2011
URL: http://www.repository.naturalis.nl/record/369711

A new species of Tetragonopterus Cuvier, 1816 (Characiformes: Characidae: Tetragonopterinae) from the rio Jari, Amapá, northern Brazil
Provedor de dados: 83
Autores: Melo,Bruno F; Benine,Ricardo C; Mariguela,Tatiane C; Oliveira,Claudio.
A new species of Tetragonopterus is described from the rio Jari, a tributary to the left margin of rio Amazonas, at the border between Amapá and Pará States, northern Brazil. It is morphologically diagnosed from the other species of the genus (T. argenteus, T. chalceus, and T. rarus new combination) by the lozenge-shaped spot on the caudal peduncle vs. rounded to square spot on the other species. Partial sequences of the mitochondrial gene Cytochrome Oxidase C subunit I, from representatives of all valid species of Tetragonopterus, including this new species, were analyzed. The obtained results revealed a significant genetic distance between the new species and its congeners. A discussion on the new combination, Tetragonopterus rarus, is also provided.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: COI gene; Genetic distance; Mitochondrial DNA; Neotropical fish; Taxonomy.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252011000100002

Genetic variability in three species of Gymnotus Linnaeus, 1758 (Gymnotiformes: Gymnotidae) from Caracu stream of the upper Paraná River basin, Brazil
Provedor de dados: 83
Autores: Rezende,Judy Ruiz; Renesto,Erasmo; Zawadzki,Cláudio Henrique.
The genetic variability of three Gymnotus species from the Caracu stream, a small tributary of the left margin of Paraná River (Brazilian upper Paraná River floodplain), was estimated with data of 17 putative allozyme loci, which were obtained by using corn starch gel electrophoresis of 10 enzymatic systems: Aspartate aminotransferase (E. C. 2.6.1.1), Alcohol dehydrogenase (E. C. 1.1.1.1), Esterase (E. C. 3.1.1.1), Glucose dehydrogenase (E. C. 1.1.1.118), Glycerol-3-phosphate dehydrogenase (E. C. 1.1.1.8), Isocitrate dehydrogenase (E. C. 1.1.1.42), L-Lactate dehydrogenase (E. C. 1.1.1.27), Malate dehydrogenase (E. C. 1.1.1.37), Superoxide dismutase (E. C. 1.15.1.1) and Sorbitol dehydrogenase (E. C. 1.1.1.14). The genetic diversity was estimated as He =...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Polymorphism; Genetic distance; Allozyme; Heterozygosity.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252009000400010

A new glanapterygine catfish of the genus Listrura (Siluriformes: Trichomycteridae) from southeastern Brazil, corroborated by morphological and molecular data
Provedor de dados: 83
Autores: Villa-Verde,Leandro; Lazzarotto,Henrique; Lima,Sergio M. Q.
Listrura costai, new species, is described from small streams in a swampy coastal plain in the rio Jurumirim basin, Angra dos Reis Municipality, Rio de Janeiro State, southeastern Brazil. The new species is morphologically very similar to L. nematopteryx and L. picinguabae, all possessing only one long pectoral-fin ray. It differs from its congeners by possessing an autapomorphic character: first hypobranchial with an anterior process (vs. process absent). Other features such as coloration, numbers of opercular and interopercular odontodes, number of anal-fin rays, head length, and shape of some bone structures help to distinguish the new species from L. nematopteryx and L. picinguabae. Molecular analyses using partial sequences of the mitochondrial DNA...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atlantic rain forest; Genetic distance; Mitochondrial DNA; Taxonomy.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252012000300005

Polymorphism of the grasshopper Rhammatocerus schistocercoides populations revealed by RAPD
Provedor de dados: 86
Autores: Silva,João Batista Tavares da; Tigano,Myrian Silvana; Magalhães,Bonifácio Peixoto; Cordeiro,Célia Maria Torres.
The objective of this work was to study the genetic variability of the grasshopper Rhammatocerus schistocercoides (Orthoptera: Acrididae) using RAPD analysis among individuals from three populations, one from Colombia and two from Brazil (Goiás and Mato Grosso States). Ninety scorable binary markers were obtained by fingerprinting with 11 oligonucleotide primers. Most of the polymorphism was attributed to 42 markers with variable frequency among the different populations. Although the existence of significant difference among populations (P&lt;0.0001), most of the genetic variability was found within populations (87.7% of total variation). Pairwise distances between Colombian and Brazilian populations were 0.12 (P&lt;0.0001) and 0.18 (P&lt;0.0001) for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Insecta; Genetic marker; Genetic variation; Genetic distance.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2002001100020

Distinct genetic structure in populations of Chrysoperla externa (Hagen) (Neuroptera, Chrysopidae) shown by genetic markers ISSR and COI gene
Provedor de dados: 92
Autores: Barbosa,Nara C. C. P.; Freitas,Sérgio de; Morales,Adriana C.
Distinct genetic structure in populations of Chrysoperla externa (Hagen) (Neuroptera, Chrysopidae) shown by genetic markers ISSR and COI gene. Green lacewings are generalist predators, and the species Chrysoperla externa presents a great potential for use in biological control of agricultural pests due to its high predation and reproduction capacities, as well as its easy mass rearing in the laboratory. The adaptive success of a species is related to genetic variability, so that population genetic studies are extremely important in order to maximize success of the biological control. Thus, the present study used nuclear (Inter Simple Sequence Repeat - ISSR) and mitochondrial (Cytochrome Oxidase I - COI) molecular markers to estimate the genetic variability...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genetic distance; Green lacewings; Insecta; Population structure; Variability.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262014000200012

Genetic diversity of captive spotted paca (Agouti paca) from south east Brazil assessed by the RAPD-PCR technique
Provedor de dados: 96
Autores: Antunes,Karine Vieira; Machado,Théa Mírian Medeiros; Serão,Nicola Vergara Lopes; Guimarães,Simone Eliza Facione; Paiva,Samuel Rezende.
The genetic diversity was analyzed among spotted paca (Agouti paca) from three commercial flocks located in Brazil. As the genome of this species is unknown, the RAPD-PCR technique was used. Ten primers generated sixty polymorphic bands. The among and within population genetic variability estimated by analysis of molecular variance (AMOVA) was 12.55 and 87.45%, respectively. The shortest Nei distance value was 11.76% among the Carangola (CG) and São Francisco do Glória (SF) populations. This value can be explained by the exchange of reproduction males and females between the two geographically close breeding sites. The analysis of principal components showed well defined and structured groups aggregating animals according their population of origin, with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Animal conservation; Animal genetic resources; Biodiversity; Genetic distance; Wild animals.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010000200006

Differentiation of free-ranging chicken using discriminant analysis of phenotypic traits
Provedor de dados: 96
Autores: Al-Atiyat,Raed M.; Aljumaah,Riyadh S.; Abudabos,Alaeldein M.; Alotybi,Masoud N.; Harron,Raafat M.; Algawaan,Abdulaziz S.; Aljooan,Hassan S.
ABSTRACT In this study, we investigated the differentiation of five different chicken ecotypes - Center, North, South, West, and East - of Saudi Arabia using discriminate analysis. The analysis was based on nine important morphological and phenotypic traits: body color, beak color, earlobe color, eye color, shank color, comb color, comb type, comb size, and feather distribution. There was a strong significant relationship between the phenotype and effect of geographic height in terms of comb type and earlobe color in males as well as body, beak, eye, and shank color. In particular, the comb type and earlobe color differentiated the ecotypes of males. Among the females, the beak, earlobe, eye, shank color, and feather distribution had more differentiating...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biodiversity; Genetic distance; Genetic variation; Indigenous; Morphology.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982017001000791

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

Genetic diversity assessment in sorghum accessions using qualitative morphological and amplified fragment length polymorphism markers
Provedor de dados: 63
Autores: Gerrano,Abe Shegro; Labuschagne,Maryke Tine; van Biljon,Angeline; Shargie,Nemera Geleta.
Qualitative morphological and amplified fragment length polymorphism (AFLP) markers were compared for assessment of genetic diversity. Nine qualitative morphological traits were recorded to compare genetic relationships among 17 sorghum accessions with information derived from six AFLP primer combinations analysis. The mean morphological genetic similarity was lower in comparison to similarity computed using AFLP markers. Genetic similarity measured by AFLP markers was similar within the Ethiopian and South African material, as well as between South African and Ethiopian material. Morphological similarity was much higher in the Ethiopian material than in the South African material, indicating that the genotypes were related. The two techniques described...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dice similarity coefficient; Genetic distance; Marker; Trait.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000500008

Estimation of genetic distance among genotypes of caraway (Carum carvi L.) using RAPD-PCR
Provedor de dados: 1
Autores: Seidler-Łożykowska, Katarzyna; Institute of Natural Fibres and Medicinal Plants; Kuczyńska, Anetta; Polish Academy of Sciences; Mikołajczyk, Katarzyna; Plant Breeding and Acclimatization Institute; Nowakowska, Joanna; Plant Breeding and Acclimatization Institute; Bocianowski, Jan; Poznań University of Life Sciences.
In order to estimate genetic diversity among starting materials and breeding strains of caraway, a collection of 17 accessions from botanical gardens in Europe, two cultivars ‘Rekord’ and ‘Kończewicki’, and four own breeding strains were analyzed by RAPD-PCR. The representative samples, each of five individual plants of accession, cultivar or strain, were taken from young rosette leaves. Forty of Genset Oligos RAPD primers were used for analysis and eight of them produced clear and reproducible banding patterns. In total, 62 banding patterns were obtained revealing 23 polymorphic bands, whereas the number of polymorphic bands ranged from two to four for one primer. The GS12 and GS43 primers generated two polymorphic bands, while each of the GS8, GS21,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carum carvi L.; Genetic distance; Genotype; RAPD.
Ano: 2014
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/18197

Genetic variability and evidence of founder effect in Hemiodus orthonops (Characiformes: Hemiodontidae) from the upper Paraná River basin, Brazil
Provedor de dados: 3
Autores: Marques, Liégie Alher; Renesto, Erasmo.
 Hemiodus orthonops is a small fish of the Hemiodontidae family, order Characiformes, with a maximum of 25 cm standard length. Until recently, H. orthonops was an endemic species from the Paraná-Paraguay basin and it was absent from the upper Paraná River basin. Since 2008, it has started to be collected in the upper Paraná River, representing up to 10% of catches. Two population samples of H. orthonops from two localities of the upper Parana River basin (Porto Camargo and Porto Figueira) were analyzed using the allozymes electrophoresis technique. Twenty-one enzymatic loci were detected. The population sample from Porto Camargo displayed a genetic variability (He = 0.1061) higher than that from Porto Figueira (He = 0.0580) and homozygote excess in both of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allozymes; Fish; Genetic distance; Heterozygosity; Protein polymorphism. genética de populações.
Ano: 2017
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/31793

Genetic diversity, population structure and AFLP markers associated with maize reaction to southern rust
Provedor de dados: 53
Autores: Giordani,Willian; Scapim,Carlos Alberto; Ruas,Paulo Maurício; Ruas,Claudete de Fátima; Contreras-Soto,Rodrigo; Coan,Marlon; Fonseca,Inês Cristina de Batista; Gonçalves,Leandro Simões Azeredo.
ABSTRACT Maize is one of the species with greater genetic diversity among cereals and possibly the most diverse crop species known. Accessing this variability is essential for maize breeding, allowing breeders to achieve progress of yield increasing, overcome environmental challenges or deal with pests and diseases. Among the maize diseases, southern rust is one of the most important, causing significant losses in yield and presenting severe epidemics worldwide. In the present study, the AFLP technique was applied to analyze population structure and genetic diversity among 145 tropical maize inbred lines, and to test for preliminary evidence of association between AFLP markers and the reaction to southern rust. Disease severity was evaluated in two crop...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Gwas; Association studies; Cluster analysis; Genetic distance; Puccinia polysora.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052019000200183

Genetic diversity in Egeria densa and E. najas in Jupiá Reservoir, Brazil
Provedor de dados: 118
Autores: Mori,Edson S; Martins,Dagoberto; Velini,Edivaldo D; Marino,Celso L; Gouvêa,Cantídio F; Leite,Suzi M.M; Camacho,Edwin; Guries,Raymond P.
The aquatic plant species Egeria densa (Planch.) Casp and E. najas Planchon occur naturally in the Paraná River Basin of southeastern Brazil. Hydroelectric dam construction in the river basin has created several lakes, changing the ecology of the river and altering the population ecology of Egeria. Large, dense populations of Egeria now grow in Jupiá Lake and its tributaries, occasionally blocking hydroelectric turbines. This study is part of a larger project examining environmental changes associated with large dam projects; the research objective of this study was to assess patterns of genetic diversity in Egeria populations growing in Jupiá and Três Irmãos Lakes and their Paraná River tributaries using genetic markers. Forty-two plants of E. najas and...
Tipo: Journal article
Palavras-chave: Egeria; Dam; Isoenzyme; Genetic distance; RAPD; Reservoir.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202012000200008

Genetic characterization of Japanese plum cultivars (Prunus salicina) using SSR and ISSR molecular markers
Provedor de dados: 118
Autores: Carrasco,Basilio; Díaz,Carole; Moya,Mario; Gebauer,Marlene; García-González,Rolando.
The genetic characterization of 29 elite Japanese plum cultivars (Prunus salicina) and 4 Prunus cultivars was carried out by analyzing 97 Simple Sequence Repeat (SSR) alleles and 232 binary Inter Simple Sequence Repeat (ISSR) loci. A high level of genetic variability was found for these two molecular markers among the Japanese plum cultivars compared to other Prunus species. On average, the variability found by analyzing the SSR alleles were Na = 12.1, Ne = 5.2, Ho = 0.9, He = 0.8 and F= -0.127, whereas ISSR yielded values of h = 0.15 and I = 0.27. The genetic relationship among cultivars was estimated with Principal Coordinate Analysis (PCA) and a Bayesian clustering approach using the software program Structure. This program identified two subgroups...
Tipo: Journal article
Palavras-chave: AMOVA; Bayesian analysis; Genetic distance; PCA; Plum; Structure.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202012000300012

Genetic divergence among processing tomato hybrids and formation of new segregating populations
Provedor de dados: 64
Autores: Figueiredo,Alex Sandro Torre; Resende,Juliano Tadeu Vilela de; Schwarz,Kélin; Marodin,Josué Clock; Galvão,Alexandre Gonçalves; Resende,Nathalia Campos Vilela.
ABSTRACT Tomato is the most important vegetable species and has a strong bottleneck effect in its domestication and evolution. In exploring the existing genetic variability in commercial germplasm, germplasm has been proven to be an excellent alternative to obtain inbred lines in order to provide superior new hybrids in the future. In this sense, the objective of this study was to estimate the genetic distance among commercial processing tomato hybrids via agronomical and quality postharvest fruit traits with the aim of suggesting promising crosses for the formation of base populations for tomato breeding. Ten hybrids of processing tomato were evaluated in a complete randomized block design with three replicates. In total, eleven agronomic and postharvest...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Solanum lycopersicum; Genetic distance; Pre-breeding; Breeding populations; Transgressive segregate.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542017000300279