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| Registros recuperados: 45 | |
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| Guzmán Valencia, Stephanie. |
| La identidad y estructura genética de poblaciones de Oligonychus punicae y O. perseae (Acari: Tetranychidae) fue estudiada en siete localidades productoras de aguacate Persea americana var. Hass. La identidad de los ácaros fue determinada morfológica y molecularmente mediante la secuenciación de una fracción del gen Citocromo Oxidasa subunidad I (COI). La variación genética intraespecífica de diferentes poblaciones de ambas especies de ácaros fue estudiada mediante la secuenciación de las regiones ITS1 e ITS2 del rADN. El análisis filogenético de las secuencias parciales del gen COI separó adecuadamente las dos especies de ácaros, confirmando los resultados de la identificación morfológica. El análisis de las secuencias de las regiones ITS1 e ITS2 del... |
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Palavras-chave: COI; ITS1; ITS2; Estructura genética; Entomología y Acarología; Maestría; Genetic structure. |
| Ano: 2012 |
URL: http://hdl.handle.net/10521/1765 |
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| Chen,Liyuan; Chen,Faju; He,Suichao; Ma,Luyi. |
| Background Genetic diversity and genetic variation of 10 populations and subpopulations of Magnolia wufengensis, a new and endangered endemic species, were examined by inter simple sequence repeat (ISSR) and sequence-related amplified polymorphism (SRAP) molecular markers. Compared with other endangered endemic Magnolia taxa, M. wufengensis holds a relatively high level of genetic variation. Result Total genetic diversity was found to be 87.7% for ISSR and 88.0% for SRAP markers. For polymorphic loci (P), the effective mean number of alleles (Ae) was 1.414 for ISSR markers and 1.458 for SRAP markers, while the mean expected heterozygosity (H) was 0.256 using ISSR and 0.291 for SRAP markers. Within-population variation was estimated for P as 74.9% using... |
| Tipo: Journal article |
Palavras-chave: Genetic structure; ISSR; Population genetic diversity; SRAP. |
| Ano: 2014 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582014000600003 |
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| Borba,Tereza Cristina de Oliveira; Brondani,Rosana Pereira Vianello; Breseghello,Flávio; Coelho,Alexandre Siqueira Guedes; Mendonça,João Antônio; Rangel,Paulo Hideo Nakano; Brondani,Claudio. |
| Association analysis was applied to a panel of accessions of Embrapa Rice Core Collection (ERiCC) with 86 SSR and field data from two experiments. A clear subdivision between lowland and upland accessions was apparent, thereby indicating the presence of population structure. Thirty-two accessions with admixed ancestry were identified through structure analysis, these being discarded from association analysis, thus leaving 210 accessions subdivided into two panels. The association of yield and grain-quality traits with SSR was undertaken with a mixed linear model, with markers and subpopulation as fixed factors, and kinship matrix as a random factor. Eight markers from the two appraised panels showed significant association with four different traits,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Association analysis; Core collection; Genetic structure. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572010000300023 |
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| Leuzzi,Maria Sueli Papa; Almeida,Fernanda Simões de; Orsi,Mário Luís; Sodré,Leda Maria Koelblinger. |
| In this study, the RAPD technique was used to analyze the genetic structure of populations of the fish Astyanax altiparanae (Characidae, Tetragonopterinae) living in the lower, middle and upper Paranapanema River, Brazil. The aim was to assess this structure regarding fish handling and conservation programs. The genetic variability (P) was found to be 42.64%, 75% and 75% in the low, middle and upper reaches, respectively. The dendrogram of genetic similarity, obtained by comparative analysis of the sets of samples from the three sites, showed the formation of three clusters. All of the genetic parameters used indicate that the population in the lower Paranapanema is genetically different from those in the middle and upper sections. The theta P test shows... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Astyanax altiparanae; RAPD; Genetic structure; Genetic conservation; Fish. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572004000300009 |
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| Soares,Sabrina Delgado; Bandeira,Ludmila Ferreira; Ribeiro,Stela Barros; Telles,Mariana Pires de Campos; Silva,João Augusto da; Borges,Canrobert Tormin; Coelho,Alexandre Siqueira Guedes; Novaes,Evandro. |
| Abstract Given its high-valued wood, the African mahogany (Khaya grandifoliola) has been envisaged as a renewable source of tropical hardwoods in Brazil. However, there are concerns about the hypothesized low diversity among the few K. grandifoliola germplasm sources introduced in the country. Using eight microsatellite markers, we evaluated the genetic diversity and divergence among 53 superior trees selected from three provenances of K. grandifoliola located in the state of Para. These populations are among the oldest plantations (>15 years) in Brazil and, therefore, the country's main seed sources. The average number of alleles per locus was 5.9, expected heterozygosity was moderate (^=0.56) and lower than the high observed heterozygosity (HO=0.74).... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Microsatellites; SSR; Genetic structure; Genetic divergence; Hardwood. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572020000400301 |
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| Bastos,Heitor B.; Gonçalves,Evonnildo C.; Ferrari,Stephen F.; Silva,Artur; Schneider,Maria Paula C.. |
| We genotyped 15 microsatellite loci in order to evaluate the effects of habitat fragmentation, caused by flooding of the Tucuruí reservoir, on the genetic structure of Alouatta belzebul in eastern Amazonia. The analysis included two populations sampled in 1984, representing both margins of the Tocantins river, and three populations sampled 18 years later. Minimal differences in the diversity levels between present-day (Ho = 0.62-0.69 and A R = 6.07-7.21) and pre-flooding (Ho = 0.60-0.62 and A R = 6.27-6.77) populations indicated there was no significant loss of genetic variability, possibly because of successful management strategies applied during the flooding. The changes observed were limited to shifts in the composition of alleles, which presumably... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Alouatta belzebul; Amazonia; Conservation; Genetic structure; Habitat fragmentation. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572010000400027 |
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| Perseguini,Juliana Morini Küpper Cardoso; Chioratto,Alisson Fernando; Zucchi,Maria Imaculada; Colombo,Carlos Augusto; Carbonell,Sérgio Augusto Moraes; Mondego,Jorge Mauricio Costa; Gazaffi,Rodrigo; Garcia,Antonio Augusto Franco; Campos,Tatiana de; Souza,Anete Pereira de; Rubiano,Luciana Benchimol. |
| A wide array of molecular markers has been used to investigate the genetic diversity among common bean species. However, the best combination of markers for studying such diversity among common bean cultivars has yet to be determined. Few reports have examined the genetic diversity of the carioca bean, commercially one of the most important common beans in Brazil. In this study, we examined the usefulness of two molecular marker systems (simple sequence repeats - SSRs and amplified fragment length polymorphisms - AFLPs) for assessing the genetic diversity of carioca beans. The amount of information provided by Roger's modified genetic distance was used to analyze SSR data and Jaccards similarity coefficient was used for AFLP data. Seventy SSRs were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: AFLPs; Genetic structure; Genetic variability; Phaseolus vulgaris L.; SSRs. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572011000100017 |
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| Vasconcelos,William R.; Hrbek,Tomas; Silveira,Ronis da; Thoisy,Benoit de; Marioni,Boris; Farias,Izeni P.. |
| The genetic structure of Caiman crocodilus was investigated using a 1085 bp mtDNA fragment of the cytochrome b gene. Inferences were based on 125 individuals from nine localities in Peru, Brazil and French Guiana. With the exception of Mamirauá Lake, Anavilhanas Archipelago and the Tapará Community which show a signal of demographic expansion, the sampled localities are in a mutation-drift genetic equilibrium. Divergence between the Amazon basin and extra-Amazon basin localities is significant; however, inference from Nested Clade Analysis cannot distinguish between continuous range expansion, long distance colonization or past fragmentation; however, past fragmentation is unlikely due to low number of mutational steps separating these two regions. The... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Genetic structure; Phylogeography; Genetic diversity; Demographic expansion; Cytochrome b; Caiman crocodilus. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572006000200006 |
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| Perseguini,Juliana Morini Küpper Cardoso; Silva,Gliciane Micaele Borges; Rosa,João Ricardo Bachega Feijó; Gazaffi,Rodrigo; Marçal,Jéssica Fernanda; Carbonell,Sérgio Augusto Morais; Chiorato,Alisson Fernando; Zucchi,Maria Imaculada; Garcia,Antonio Augusto Franco; Benchimol-Reis,Luciana Lasry. |
| Because of the continuous introduction of germplasm from abroad, some collections have a high number of accessions, making it difficult to explore the genetic variability present in a germplasm bank for conservation and breeding purposes. Therefore, the aim of this study was to quantify and analyze the structure of genetic variability among 500 common bean accessions to construct a core collection. A total of 58 SSRs were used for this purpose. The polymorphism information content (PIC) in the 180 common bean accessions selected to compose the core collection ranged from 0.17 to 0.86, and the discriminatory power (DP) ranged from 0.21 to 0.90. The 500 accessions were clustered into 15 distinct groups and the 180 accessions into four distinct groups in the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Molecular markers; Genetic diversity; Genetic structure; Microsatellites; Phaseolus vulgaris L. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572015000100067 |
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| Fazzi-Gomes,Paola; Guerreiro,Sávio; Palheta,Glauber David Almeida; Melo,Nuno Filipe Alves Correa de; Santos,Sidney; Hamoy,Igor. |
| Abstract Colossoma macropomum is the second largest scaled fish of the Amazon. It is economically important for commercial fisheries and for aquaculture, but few studies have examined the diversity and genetic structure of natural populations of this species. The aim of this study was to investigate the levels of genetic variability and connectivity that exist between three natural populations of C. macropomum from the Amazon basin. In total, 247 samples were collected from the municipalities of Tefé, Manaus, and Santarém. The populations were genotyped using a panel of 12 multiplex microsatellite markers. The genetic diversity found in these populations was high and similar to other populations described in the literature. These populations showed a... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Tambaqui; Genetic variability; Gene flow; Genetic structure; Single sequence repeats. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572017000100142 |
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| Prunier, Jérôme G.; Saint‐pé, Keoni; Blanchet, Simon; Loot, Géraldine; Rey, Olivier. |
| Inferring parameters related to the aggregation pattern of parasites and to their dispersal propensity are important for predicting their ecological consequences and evolutionary potential. Nonetheless, it is notoriously difficult to infer these parameters from wildlife parasites given the difficulty in tracking these organisms. Molecular‐based inferences constitute a promising approach that has yet rarely been applied in the wild. Here, we combined several population genetic analyses including sibship reconstruction to document the genetic structure, patterns of sibship aggregation, and the dispersal dynamics of a non‐native parasite of fish, the freshwater copepod ectoparasite Tracheliastes polycolpus. We collected parasites according to a hierarchical... |
| Tipo: Text |
Palavras-chave: Full‐sibs; Genetic structure; Parasite dispersal; Parentage analysis; Tracheliastes polycolpus; Transmission. |
| Ano: 2021 |
URL: https://archimer.ifremer.fr/doc/00693/80499/83694.pdf |
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| Registros recuperados: 45 | |
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