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Registros recuperados: 25
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Agronomical, genetical and developmental characterization of fs6.4: a Quantitative Trait Locus controlling melon fruit shape National Institute of Agronomic Research
Moreno, E.; Fernández-Silva, I.; Eduardo, I.; Mascarell, A.; Alvarez, J.M.; Caño, A.; Monforte, A.J..
The genetic control of melon fruit shape is complex. Recently, several Quantitative Trait Loci (QTLs) affecting melon fruit shape have been identified using an introgression line population derived from the cross between a Cucumis melo ‘Piel de Sapo’ cultivar and the Korean accession PI 161375 ‘Songwan Charmi’ (SC). One of these QTLs, fs6.4, was selected for further genetical and developmental characterization. The SC allele of fs6.4 induces round fruit by limiting the longitudinal development of the fruit. Its mode of gene action is largely additive, showing low interactions with environment, genetic background or when combined with other fruit shape QTLs. Its chromosomal position could be narrowed to the central part of Linkage Group VI, breaking the...
Tipo: Conference Paper Palavras-chave: Introgression line; Epistasis; Interaction; Flower development; QTL; Fruit shape; Genetic mapping; Fine mapping; Fruit morphology.
Ano: 2008 URL: http://hdl.handle.net/2174/198
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An approach for understanding the heredity of two quality traits (head color and tightness) in globe artichoke (Cynara scolymus L.) Genet. Mol. Biol.
Cravero,Vanina Pamela; Picardi,Liliana Amelia; Cointry,Enrique Luis.
The inheritance of head color and tightness in globe artichoke was studied utilizing crosses between inbreed lines and between clones and self-pollinated clones from different genetic origins. These genetic materials were sowed in a completely randomized design with 20 plants per plot and genotype. Globe artichoke heads were classified into three colors (purple-green, purple and green) and three head tightness types (compact, fairly compact and soft) and the segregating ratios for these traits tested in each offspring using the chi-square test. Crosses between green and purple inbreed lines produced only purple-green heads but F2 generation segregated at a purple-green:purple:green ratio of 9:3:4. The self-pollinated compact head clones produced a compact...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Globe artichoke; Heredity; Inbreed lines; Clones; Epistasis.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572005000300016
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Análisis de medias generacionales para estimar parámetros genéticos de rendimiento en una cruza de pimentón y ají cayenne (Capsicum annuum) Acta Agron. (Palmira)
Aguilar Silva,Fernando; Aguilar Silva,Bernardo; García,Mario Augusto.
El peso de frutos por planta es una característica compleja y controlada por múltiples genes donde el ambiente interfiere en la manifestación fenotípica. La estimación de componentes génicos como los de interacción epistática es de gran importancia en el proceso de mejoramiento genético de una especie. El objetivo de este estudio fue la estimación de parámetros genéticos para el peso del fruto por planta, usando un análisis de medias generacionales (P1, P2, F1, F2, RC<sub1 y RC2), derivados del cruzamiento entre las líneas endocriadas de pimentón serrano y aji cayenne cultivar 958, Capsicum annuum L. El análisis reveló que los componentes genéticos de aditividad, dominancia y las interacciones epistáticas digénicas fueron significantes en la...
Tipo: Journal article Palavras-chave: Acción génica; Aditividad; Dominancia; Epistasis; Heredabilidad.
Ano: 2013 URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122013000100011
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Aplicación de marcadores AFLP para explorar heterosis en Capsicum spp. Phyton
Castañón-Najera,G; Ramírez-Meraz,M; Ruiz-Salazar,R; Mayek-Pérez,N.
Las variedades de chile: (1) Mirador, (2) Piquín huasteco, (3) Pico paloma (4) Ozulamero y (5) Chilpaya Tabasco, fueron cruzadas en un dialélico que no incluyó las cruzas recíprocas para producir 10 combinaciones híbridas F1. Mientras las variedades (1), (2) y (4) pertenecen a Capsicum annuum, la (3) y la (5) pertenecen a Capsicum frutescens. Los cuatro marcadores AFLP usados amplificaron 282 bandas o fragmentos, y de éstos 264 fueron polimórficos. Los parámetros genéticos estimados mostraron que existió dominancia en base a las distancias genéticas obtenidas con los fragmentos de ADN. La heredabilidad estimada en sentido estrecho fue moderada (0,53), lo que manifiesta la presencia de efectos dominantes. El análisis de conglomerados con base en distancias...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Análisis molecular; Cruzas dialélicas; Epistasis; Dominancia; Especies de chile.
Ano: 2011 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572011000100008
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Color polymorphism and allele frequency in a Brazilian population of the sunflower caterpillar Chlosyne lacinia saundersi (Doubleday) (Lepidoptera: Nymphalidae) Neotropical Entomology
Lopes-da-Silva,Marcelo; Casagrande,Mirna M..
The aim of this work was at calculating allele frequency color polymorphism in a population of sunflower caterpillar, Chlosyne lacinia saundersi (Doubleday) from Londrina, Paraná State, Brazil. Allele frequency in insect populations can be used as genetic marker to compare populations from different geographical and host origins. There are three phenotypes conditioned by two loci interacting epistatically. The phenotypes are: rufa (oranged colored larvae), bicolor (black larvae with dorsal orange stripes) and nigra, larvae with the body entirely black, sometimes with dorsal yellow dots, best seen in the fourth and fifth instars. Samples were taken independently in an attempt to obtain all combinations of crossing among genotypes. The genetic mechanism of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Epistasis; Population genetics; Ecological genetics; Phenotype.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2003000100025
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Contrasting effects of historical contingency on phenotypic and genomic trajectories during a two-step evolution experiment with bacteria ArchiMer
Plucain, Jessica; Suau, Antonia; Cruveiller, Stephane; Medigue, Claudine; Schneider, Dominique; Le Gac, Mickael.
Background The impact of historical contingency, i.e. the past evolutionary history of a population, on further adaptation is mostly unknown at both the phenotypic and genomic levels. We addressed this question using a two-step evolution experiment. First, replicate populations of Escherichia coli were propagated in four different environmental conditions for 1000 generations. Then, all replicate populations were transferred and propagated for further 1000 generations to a single new environment. Results Using this two-step experimental evolution strategy, we investigated, at both the phenotypic and genomic levels, whether and how adaptation in the initial historical environments impacted evolutionary trajectories in a new environment. We showed that...
Tipo: Text Palavras-chave: Experimental evolution; Escherichia coli; Adaptation; Historical contingency; Epistasis.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00333/44447/44118.pdf
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Controle genético da resistência da soja à raça 4 de Cercospora sojina. Repositório Alice
MARTINS FILHO, S.; GRAVINA, G. de A.; SEDIYAMA, C.S..
O objetivo deste trabalho foi estudar o controle genético da resistência à Cercospora sojina, em populações segregantes derivadas do cruzamento entre as cultivares de soja Paraná e Bossier. Foram avaliadas nos genitores e nas gerações F1, F2, RC1 e RC2 seis características das plantas associadas com a doença: nota para infecção (NT); número de lesões por folíolo (NLF); diâmetro médio de lesão (DML); porcentagem de área foliar lesionada (PAFL); número de lesões por cm2 (NLC) e índice de doença (ID). A resistência da soja à cercosporiose comportou-se como um caráter quantitativo, e o efeito gênico aditivo o mais importante. As influências sobre NT foram as seguintes: efeito aditivo (62,05%), efeito da dominância (7,68%) e as interações epistáticas aditiva x...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Glycine max; Epistasia; Herança genética; Mancha-olho-de-rã; Epistasis; Genetic inheritance; Frogeye leaf spot.
Ano: 2002 URL: http://www.alice.cnptia.embrapa.br/handle/doc/108853
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Detection of simple sequence repeat markers associated with resistance to whitebacked planthopper, Sogatella furcifera (Horvath), in rice International Rice Research Institute
Kadirvel, P.; Maheswaran, M.; Gunathilagaraj, K..
p.22-23
Palavras-chave: Crosses; Epistasis; Gene interaction; Gene mapping; Genetic markers; Linkage; Insect pests; Sogatella furcifera; Pest resistance; Quantitative traits; Quantitative trair loci.
Ano: 2003 URL: http://hdl.handle.net/123456789/1192
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Diallel analysis and heterosis components in paprika peppers Rev. Ciênc. Agron.
Lasmar,André; Maluf,Wilson Roberto; Ticona-Benavente,César Augusto; Nogueira,Douglas William; Nogueira,Danilo Gustavo.
ABSTRACT The aim of this study was to quantify and assess the components of heterosis in paprika hybrids related to yield, capsanten pigment content (estimated as ASTA degrees) and resistance to Phytophthora capsici, and to identify parental lines with high general combining ability (GCA) to be used in future breeding programmes and/or to obtain new hybrids. Fifteen hybrids were obtained through a complete diallel cross (reciprocal hybrids excluded) among six proprietary paprika breeding lines from HortiAgro Sementes S.A., four of which originally introduced from Peru (P1=PIM 032-03; P2=PIM 033-11; P3=PIM 034-19; P4=PIM 035-01) and two from the U.S.A. (P5=PIM 036-08; P6=PIM 037-18). Epistatic gene action was involved in the expression of heterosis for...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Capsicum annuum; General combining ability; Phytophthora capsici; Hybrid vigor; Gene action; Epistasis.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902019000200282
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Dissecting the genetic architecture of complex traits and its impact on genetic improvement programs: lessons learnt from the Virginia chicken lines R. Bras. Zootec.
Pettersson,Mats E.; Carlborg,Örjan.
Long-term selection experiments provide a valuable resource for understanding the genetic changes that take place in animal improvement programs. The Virginia chicken lines have for more than 50 years been subjected to single-trait, bi-directional, divergent selection for high and low juvenile body weight. It is one of the most well studied experimental populations in agricultural animals and has played an instrumental role in the understanding of the genetic basis of complex traits. In this paper, we summarize the findings from the more recent publications focusing on the efforts to identify the loci contributing to selection response as well as discuss the currently ongoing research. We conclude by describing some future research prospects that promise...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Body weight; Chicken; Epistasis; Metabolic; QTL; Selection.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010001300028
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Epistasis and genotype-by-environment interaction of grain protein content in durum wheat Genet. Mol. Biol.
Bnejdi,Fethi; Gazzah,Mohamed El.
Parental, F1, F2, BC1 and BC2 generations of four crosses involving four cultivars of durum wheat (Triticum durum Desf.) were evaluated at two sites in Tunisia. A three-parameter model was found inadequate for all cases except crosses Chili x Cocorit 71 at site Sidi Thabet and Inrat 69 x Karim at both sites. In most cases a digenic epistatic model was sufficient to explain variation in generation means. Dominance effects (h) and additive x additive epistasis (i) (when significant) were more important than additive (d) effects and other epistatic components. Considering the genotype-by-environment interaction, the non-interactive model (m, d, h, e) was found adequate. Additive variance was higher than environmental variance in three crosses at both sites....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Epistasis; Genotype x environment interaction; Heritability; Grain protein; Wheat.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572010000100021
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Epistasis interaction of QTL effects as a genetic parameter influencing estimation of the genetic additive effect Genet. Mol. Biol.
Bocianowski,Jan.
Epistasis, an additive-by-additive interaction between quantitative trait loci, has been defined as a deviation from the sum of independent effects of individual genes. Epistasis between QTLs assayed in populations segregating for an entire genome has been found at a frequency close to that expected by chance alone. Recently, epistatic effects have been considered by many researchers as important for complex traits. In order to understand the genetic control of complex traits, it is necessary to clarify additive-by-additive interactions among genes. Herein we compare estimates of a parameter connected with the additive gene action calculated on the basis of two models: a model excluding epistasis and a model with additive-by-additive interaction effects....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Additive gene action effect; Barley; Doubled haploid lines; Epistasis; QTL.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572013000100013
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Epistasis of polymorphisms related to the articular cartilage extracellular matrix in knee osteoarthritis: Analysis-based multifactor dimensionality reduction Genet. Mol. Biol.
Fernández-Torres,Javier; Martínez-Nava,Gabriela Angélica; Zamudio-Cuevas,Yessica; Lozada,Carlos; Garrido-Rodríguez,Daniela; Martínez-Flores,Karina.
Abstract Osteoarthritis (OA) is a complex disease with a multifactorial etiology. The genetic component is one of the main associated factors, resulting from interactions between genes and environmental factors. The aim of this study was to identify gene-gene interactions (epistasis) of the articular cartilage extracellular matrix (ECM) in knee OA. Ninety-two knee OA patients and 147 healthy individuals were included. Participants were genotyped in order to evaluate nine variants of eight genes associated with ECM metabolism using the OpenArray technology. Epistasis was analyzed using the multifactor dimensionality reduction (MDR) method. The MDR analysis showed significant gene-gene interactions between MMP3 (rs679620) and COL3A1 (rs1800255), and between...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Epistasis; Extracellular matrix; Knee osteoarthritis; Multifactor dimensionality reduction; Polymorphisms.
Ano: 2020 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572020000400102
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Epistatic effects on grain yield of soybean [Glycine max (L.) Merrill]. Repositório Alice
BARONA, M. A. A.; COLOMBARI FILHO, J. M.; SANTOS, V. da S.; GERALDI, I. O..
Studies addressing the estimation of genetic parameters in soybean have not emphasized the epistatic effects. The purpose of this study was to estimate the significance of these effects on soybean grain yield, based on the Modified Triple Test Cross design. Thirty-two inbred lines derived from a cross between two contrasting lines were used, which were crossed with two testers (L1 and L2). The experiments were carried out at two locations, in 10 x 10 triple lattice designs with 9 replications, containing 32 lines (Pi ), 64 crosses (32 Pi x L1 and 32 Pi x L2 ) and controls. The variation between ( L li + L 2i - P i ) revealed the presence of epistasis, as well as an interaction of epistasis x environment. Since the predominant component of epistasis in...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Regulação da expressão genética; Soja; Gene; Interação genética; Soybean; Epistasis; Gene expression regulation; Genotype-environment interaction.
Ano: 2012 URL: http://www.alice.cnptia.embrapa.br/handle/doc/945909
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Evolutionary history and genetic parallelism affect correlated responses to evolution ArchiMer
Le Gac, Mickael; Cooper, Tim F.; Cruveiller, Stephane; Edigue, Claudine M.; Schneider, Dominique.
We investigated the relationship between genomic and phenotypic evolution among replicate populations of Escherichia coli evolved for 1000 generations in four different environments. By resequencing evolved genomes, we identified parallel changes in genes encoding transcription regulators within and between environments. Depending on both the environment and the altered gene, genetic parallelism at the gene level involved mutations that affected identical codons, protein domains or were widely distributed across the gene. Evolved clones were characterized by parallel phenotypic changes in their respective evolution environments but also in the three alternative environments. Phenotypic parallelism was high for clones that evolved in the same environment,...
Tipo: Text Palavras-chave: Adaptation; Epistasis; Experimental evolution; Genome sequencing; Parallelism.
Ano: 2013 URL: https://archimer.ifremer.fr/doc/00148/25928/24096.pdf
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Inheritance of type I glandular trichomes in Cucumis melo National Institute of Agronomic Research
Palomares-Rius, F.J.; Sarria, E.; Alba, J.M.; Gómez-Guillamón, M.L..
A high density of glandular trichomes of Type I could contribute to enhance resistance to Aphis gossypii in melon breeding programs with the Vat gene. To study the inheritance of this trait, a six-generation genetic family was obtained from the cross between the accession TGR-1551, with high density of glandular trichomes and the Spanish cultivar ‘Bola de oro’ with low trichome density. The genetic model estimated showed that the Type I trichome density followed an oligogenic inheritance with important additive effect and strong epistatic effect between heterozygous loci. The values for broad sense heritability (H2) and narrow sense heritability (h2) were 0.86 and 0.50, respectively, which made this character suitable for breeding.
Tipo: Poster Palavras-chave: Aphis gossypii; Antixenosis; Heritability; Genetic model; Additive; Dominance; Epistasis.
Ano: 2008 URL: http://hdl.handle.net/2174/250
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Interacciones génicas no alélicas en caracteres de variación continua. Colegio de Postgraduados
Cervantes Santana, Tarsicio; Bucio Alanís, Lauro.
En este trabajo se considera que la expresión fenotípica de un carácter en los individuos de una población, se debe a efectos genéticos y a efectos ambientales. En los genéticos se incluyen aditividad (d), dominancia (h) e interacciones entre dos pares de genes alelomórficos (i, j y l) y se toma como origen de medida para d, h, i, j y l, la media de los padres P1 y P2, que es el sistema de medida de Van der Veen (F oo-metric). En la primera parte se trata con las medidas de generaciones y se da el modelo lineal aditivo que incluye las componentes genéticas arriba citadas; en este caso los efectos de cada componente se localizan en diferentes términos de cada ecuación y fácilmente se puede hacer la estimación de los parámetros del modelo. Para tener un...
Tipo: Artículo Palavras-chave: Genética; Varianza genética; Variación fenotípica; Modelos lineales; Epistasis.
Ano: 1969 URL: http://hdl.handle.net/10521/1913
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Lack of evidence for intermolecular epistatic interactions between adiponectin and resistin gene polymorphisms in Malaysian male subjects Genet. Mol. Biol.
Lau,Cia-Hin; Muniandy,Sekaran.
Epistasis (gene-gene interaction) is a ubiquitous component of the genetic architecture of complex traits such as susceptibility to common human diseases. Given the strong negative correlation between circulating adiponectin and resistin levels, the potential intermolecular epistatic interactions between ADIPOQ (SNP+45T > G, SNP+276G > T, SNP+639T > C and SNP+1212A > G) and RETN (SNP-420C > G and SNP+299G > A) gene polymorphisms in the genetic risk underlying type 2 diabetes (T2DM) and metabolic syndrome (MS) were assessed. The potential mutual influence of the ADIPOQ and RETN genes on their adipokine levels was also examined. The rare homozygous genotype (risk alleles) of SNP-420C > G at the RETN locus tended to be co-inherited...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Adipokine; ADIPOQ; Epistasis; Interaction; RETN.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572012000100005
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Milk and fat production of crossbred Holstein-Gir cows (Bos taurus taurus-Bos taurus indicus) in the agreste region of the Brazilian state of Pernambuco Genet. Mol. Biol.
Barbosa,Severino B.P.; Ramalho,Ricardo P.; Monardes,Humberto G.; Dias,Flávio M.; Santos,Djalma C. dos; Batista,Ângela M.V..
The productive performance of four Holstein-Gir genetic groups (1/2H, 1/4H, 5/8H, 5/8Hinter se) and the effects of non-genetic factors on production traits was evaluated using a data set of 7,951 test-day samples collected between January 1980 and December 1999 from the Arcoverde Experimental Station in the Brazilian state of Pernambuco (Empresa Pernambucana de Pesquisa Agropecuária). The statistical model included the fixed effects of calving year (1980 to 1999) and month (January to December), genetic group of the cow, age at months of calving (33 to 190) and days in milk at each test-day. Random effects were sire, cow and residual with test-days treated as repeated records within each cow within each lactation. For the four genetic groups the milk yield...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Genetic groups; Epistasis; Genetics groups; Recombination; Repeated measures; Test-day.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572008000300012
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Pre-weaning performance evaluation of a multibreed Aberdeen Angus × Nellore population using different genetic models R. Bras. Zootec.
Lopes,Jader Silva; Rorato,Paulo Roberto Nogara; Weber,Tomás; Araújo,Ronyere Olegário de; Dornelles,Mariana de Almeida; Comin,Juliana Grigolleto.
This work aimed at estimating the genetic effects that affect the pre-weaning performance of animals from multibreed crosses. In order to do so, it was used information of the weight at weaning of 79,521 animals, sired by 1,020 bulls and 61,898 cows from Aberdeen Angus and Nellore breeds and from many genetic groups resulted from their crosses. Five genetic models were tested: model 1, containing the fixed breed genetic effects (additive direct and maternal effects, heterozygote direct and maternal effects, epystatic direct and maternal effects, joint additive direct and maternal effects); model 2, equal to model 1, excluding direct and maternal joint additive effects; model 3, equal to model 1, excluding direct and maternal epystatic effects; model 4,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Additive effect; Complementarity among breeds; Epistasis; Heterozygous; Multicollinearity; Weaning weight.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010001100014
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