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| Registros recuperados: 158 | |
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| Scheepmaker, Maarten; Dalfsen, Jan van. |
| Genetic differentiation among G. fossarum Koch, 1835 from different stations in Germany, Switzerland, Belgium and northern France, and the closely related Belgian form G. caparti Pètre-Stroobants, 1980 was investigated by electrophoresis at 20 enzyme loci. Although morphologically variable, geographically distant populations of G. cf. fossarum were hitherto considered conspecific. In the present study, populations of G. cf. fossarum and G. caparti were examined with reference to G. pulex pulex as an estimate for genetic differentiation at the species level. With G. p. pulex as a standard, genetic differentiation among geographically distant populations of G. cf. fossarum is occasionally observed at species level. The populations of G. caparti studied were... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Taxonomy; Distribution; Morphology; Genetic variability; Gammarus. |
| Ano: 1989 |
URL: http://www.repository.naturalis.nl/record/504137 |
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| Matioli,André L; Pallini,Angelo; Tavares,Mara G. |
| Stigmaeidae are very important predators of mite and insect pests on several crops in Brazil. It is considered the second most important family of predatory mites in citrus orchards in Brazil. However, their identification, especially that of the members of the genus Agistemus, is rather difficult based only on morphology. Hence, this study describes the use of random amplified polymorphic DNA (RAPD-PCR) markers to determine the genetic similarity of an Agistemus pallinii Matioli et al population found in 2004 in a citrus orchard in Viçosa, Minas Gerais State, Brazil, preying on Panonychus citri (McGregor). Amplifi cations were performed with 12 random primers (OPAA8, OPAA19, OPAB1, OPAB5, OPAB18, OPAC9, OPAC17, OPAC19, OPAD10, OPAE9, OPAE12 and OPAE17),... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Predatory mite; Genetic variability; Molecular marker. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2009000200015 |
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| Arias,Lida; Bejarano,Eduar E.; Márquez,Edna; Moncada,John; Vélez,Iván; Uribe,Sandra. |
| Studies of insect vectors may be facilitated by using laboratory colonies. However, it has been suggested that the colony insects are not representative of natural populations, sometimes yealding to erroneous interpretations of the intraspecific genetic variation between the individuals. In the present study the variability of the mitochondrial gene cytochrome b was evaluated among a closed laboratory colony of Anopheles albimanus that was founded 20 years ago and the field population from which it was derived. The analyses revealed the presence of five and three nucleotide haplotypes in the wild and colony populations, respectively. Wild individuals presented greater variability than those of the colony based on the number of polymorphic sites, haplotype... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Genetic variability; Malaria; Mosquito. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2005000300020 |
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| Lopes-da-Silva,Marcelo; Tonet,Gabriela E.L.; Vieira,Luiz G.E.. |
| The greenbug Schizaphis graminum (Rondani) is one of the most important cereals pests in the world. Within populations of this species, several biotypes, which are clones that share same virulence relationships with cultivated plants, can be distinguished. Molecular markers have been used to genetically characterize insect populations because they are fast and cost effective. In order to find RAPD markers to identify Brazilian S. graminum biotypes, nineteen clonal populations of three biotypes (B, C and E) from Brazil and three clonal populations from the U.S. were examined. Eighteen primers were used to analyze the material, but only six primers revealed polymorphisms and among those, three produced diagnostic band profiles that allowed biotype... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Genetic variability; Molecular marker; Greenbug; Insect-plant relationship. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2004000100009 |
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| Costa, Reginaldo Brito da; Azevedo, Luana Pâmella de Almeida; Martinez, Diego Tyszka; Tsukamoto Filho, Antonio de Arruda; Fernandes, Dayane Ávila; Oliveira, Oacy Eurico de; Resende, Marcos Deon Vilela de. |
| The study aimed to estimate parameters, values and genetic gain for growth traits in progenies of Eucalyptus camaldulensis, in the State of Mato Grosso. The progenies test was conducted under a randomized block design with 132 progenies, five replications and three plants in single rows, spaced 3 m x 2 m in Santo Antonio do Leverger, MT. At 24 months of age, progenies were evaluated for the characters: a) diameter at base height (DBH), in centimeters, b) total height, in meters, c) survival. The individual in the narrow sense heritability for the traits studied can be considered medium to high magnitude (0.13 and 0.21) for height and diameter, respectively. The heritability for survival were practically nil, due to low genetic variability among the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Genetic variability; Genetic gain; Early selection; Mixed linear model Variabilidade genética; Ganho genético; Seleção precoce; Modelo linear misto. |
| Ano: 2012 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/337 |
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| Menegatti, Renata Diane; Mantovani, Adelar; Navroski, Márcio Carlos. |
| Objetivou-se com este trabalho estimar parâmetros e valores genéticos para os caracteres diâmetro do coleto e altura de progênies de bracatinga em fase inicial de desenvolvimento. As sementes foram coletadas de 40 matrizes nativas nos municípios de Abelardo Luz, Chapadão do Lageado, Lages e Três Barras, SC. O teste de progênie foi conduzido na Fazenda Experimental do Centro de Ciências Agroveterinárias da Universidade do Estado de Santa Catarina, em Lages, visando à seleção de materiais genéticos adaptados ao local. O delineamento utilizado foi o de blocos ao acaso, com quarenta tratamentos (progênies), 30 repetições e dez plantas por parcela em linhas simples. Aos 12 meses de idade, foram avaliados os caracteres: diâmetro do coleto e altura total dos... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Melhoramento Florestal; Engenharia Florestal; Genética Vegetal herdabilidade melhoramento florestal teste de progênies variabilidade genética. Heritability; Tree breeding; Genetic variability. |
| Ano: 2016 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/1003 |
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| Bernardo,Karla Annielle da Silva; Freire Filho,Francisco Rodrigues; Ribeiro,Valdenir Queiroz; Vieira,Paulo Fernando de Melo Jorge; Lopes,Ângela Celis de Almeida; Oliveira,Rosana Mendes de Moura. |
| Abstract: The objective of this work was to obtain cowpea (Vigna unguiculata) progenies with compound inflorescences, short peduncles, early cycle, good plant architecture, and high-yielding potential. The initial genetic material consisted of 453 F2:3 progenies, selected from ten crosses and evaluated using Federer’s augmented block design, with two controls. Of these, 60 progenies from the F4:5 and F4:6 generations were selected and assessed in two consecutive experiments, both in a 8x8 lattice design with four controls and four replicates. Early selection was efficient at fixing the evaluated traits. A wide genetic variability was detected among and within progenies. The estimated and obtained heritability and genetic gains in the F4:5 and F4:6... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Vigna unguiculata; Breeding; Genetic variability; Heritability; Quantitative genetics. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018001001150 |
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| Carvalho,Jane Fiuza Rodrigues Portela de; Robinson,Ingrid Peters; Alfenas,Acelino Couto. |
| The objectives of this work were to optimize the isozyme electrophoresis technique for Bixa orellana, and use isozyme markers for a preliminary survey on the genetic variability in Brazilian annatto germplasm accessions. Collection consisted of seed samples from sixty open pollinated trees, representing two Northern and four Southern geographic provenances. The extraction, electrophoresis, and interpretation of annatto isozymes are described. Three out of the twenty-one identified isozyme loci were polymorphic in the collection. The percentage of polymorphic loci (P = 21.05) and the expected heterozygosity in annatto (H T = 0.064) were low, compared to other tropical woody species. A UPGMA phenogram, constructed with Nei's genetic distances, clearly... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Germplasm; Lipstick plant; Genetic variability; Allozyme; Phenogram. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2005000700005 |
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| Silva,Emanuel Marques da; Correia,Anísia Soraia Abreu; Lopes,Nuno Alexandre Amaral; Nóbrega,Humberto Gil Moreira; Ganança,José Filipe Teixeira; Domingues,Ana Maria; Khadem,Manhaz; Slaski,Jan Jacek; Carvalho,Miguel Ângelo Almeida Pinheiro de. |
| The objective of this work was to determine the geographic origin of the Madeiran common bean (Phaseolus vulgaris) gene pool. Phaseolin patterns of 50 accessions representing the diversity of common bean collected in Madeira, Portugal, and conserved in the ISOPlexis Germplasm Bank, were analysed using the Experion automated electrophoresis system, based on lab-on-a-chip technology. Five common bean standard varieties with typical phaseolin patterns were used to determine the phytogeographical origin of the Madeiran common bean accessions. Ninety two percent of the accessions exhibited a phaseolin pattern consistent with the one of common bean types belonging to the Andean gene pool, while the origin of the remaining 8% of the accessions was... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Phaseolus vulgaris; Gene pool; Genetic variability; Germplasm; Lab-on-a-chip technology. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2010000800012 |
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| Bertan,Ivandro; Carvalho,Fernando Irajá Félix de; Oliveira,Antonio Costa de; Benin,Giovani; Vieira,Eduardo Alano; Valério,Igor Pirez. |
| The objectives of this work were to estimate the genetic distance among wheat genotypes using morphological, pedigree, molecular, and combined morphological and molecular measures, to determine the correlations between these measures, and to evaluate the combining ability of the genotypes. Three generations and two planting designs were studied. Six wheat genotypes were crossed using a diallel design. The F1, F2 and F3generations were evaluated in the field, in the crop seasons of 2003, 2004 and 2005, under spaced plant and full-row planting designs. The estimated general and specific combining abilities of tested hybrids were influenced both by the generation and the planting design. The correlation coefficients among the distance measures and between... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Triticum aestivum; Combining ability; Genetic variability; Parental selection. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2009000200007 |
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| Ribeiro,Nerinéia Dalfollo; Domingues,Lucas da Silva; Zemolin,Allan Emanoel Mezzomo; Possobom,Micheli Thaise Della Flora. |
| The objective of this work was to evaluate the genetic variability of common bean lines for cycle, weight of 100 grains, grain yield, cooking time, and grain calcium and iron concentrations. Twenty-four common bean lines were evaluated in two crop cycles (2010 and 2011). The ¯Z index was used for the selection of superior lines for most of the traits. The DF 06-19, DF 06-03, DF 06-17, DF 06-20, DF 06-11, DF 06-14, DF 06-01, DF 06-08, DF 06-22, and DF 06-04 lines showed high grain yield. All lines were of semi-early cycle and of fast cooking. The DF 06-08 and DF 06-23 lines showed high calcium concentration in grains (>1.4 g kg-1 dry matter - DM), and the DF 06-09, DF 06-03, DF 06-04, and DF 06-06 lines presented high iron concentration in grains... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Phaseolus vulgaris; Cooking time; Genetic variability; Genotype x environment interaction; Nutritional quality; ¯Z index. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2013001000008 |
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| Schuck,Mariane Ruzza; Moreira,Flavia Maia; Guerra,Miguel Pedro; Voltolini,José Afonso; Grando,Maria Stella; Silva,Aparecido Lima da. |
| The objective of this work was to characterize the grape germplasm in Santa Catarina, Brazil, using microsatellite DNA markers (simple sequence repeats - SSR). The DNA samples were collected from leaves and shoots of accessions of public and private collections from the counties Urussanga, Nova Trento, Rodeio, São Joaquim, Campos Novos, Videira, and Água Doce. Ten SSR loci (VVS2, VVMD5, VVMD7, VVMD27, VrZAG62, VrZAG79, VVMD25, VVMD28, VVMD31, and VVMD32) were analysed by capillary electrophoresis. Molecular profiling was conducted for 190 grapevines (European, American, and hybrids), and 67 genotypes were obtained. The data were compared with each other and with those from the literature and from online databases, in order to identify varieties and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Vitis spp.; Cultivar identification; Genetic variability; Germplasm collection; Molecular markers. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2009000500008 |
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| CORREIA,N.M.; ACRA,L.T.; BALIEIRO,G.. |
| This study aimed to control different populations of Digitaria insularisby glyphosate herbicide, isolated and mixed, besides the combination of methods (chemical and mechanical) to manage resistant adult plants. Three experiments were conducted, one in pots which were maintained under non-controlled conditions and two under field conditions. In the experiment in pots, twelve populations of D. insularis were sprayed with isolated glyphosate (1.44 and 2.16 kg a.e. ha-1) and mixed (1.44 and 2.16 kg a.e. ha-1) with quizalofop-p tefuryl (0.12 kg i.a. ha-1). The treatment of 1.44 kg a.e. ha-1 of glyphosate plus 0.12 kg a.i. ha-1 of quizalofop was sufficient for adequate control (>95%) of all populations. Population 11 (area of grain production in Itumbiara,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Desiccation; Glyphosate; Tolerance; Genetic variability. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582015000100093 |
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| Registros recuperados: 158 | |
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