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| Registros recuperados: 117 | |
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| Gajardo, G.; Mercado, C.; Beardmore, J.A.; Sorgeloos, P.. |
| An <i>Artemia</i> population from a site recently described in Chile and located in a semi-arid and humid hydrographical zone (Torres del Paine National Park), was electrophoretically characterized and cross-bred (followed through <i>F</i><sub>3</sub>) to reference samples of <i>A. franciscana</i> (San Francisco Bay, California, USA) and <i>A. persimilis</i> (Buenos Aires, Argentina), which are the species most likely to be found in Chile. The population exhibited high levels of genetic variability as judged by the percentage of polymorphic loci (<i>P</i>=53.3), mean number of alleles per locus (<i>n</i>=2.2) and mean heterozygosity (<i>H</i>=0.176). Based on... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Allopatric populations; Allozymes; Genetic isolation; Hybridization; Population genetics; Chile. |
| Ano: 1999 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=4016 |
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| Batista, Camila Moreira; Freitas, Miguel Luiz Menezes; Moraes, Marcela Aparecida de; Zanatto, Antonio Carlos Scatena; Santos, Pedro César dos; Zanata, Marcelo; Moraes, Mario Luiz Teixeira de; Sebbenn, Alexandre Magno. |
| The present study aimed at estimating genetic parameters and variability among and within provenances for silvicultural traits of Handroanthus vellosoi (Toledo) Mattos, in provenances and progenies test stands, located at the Luiz Antônio Experimental Station (São Paulo State, Brazil). The test was established in the compact family block design, with two provenances (allocated in the plots), six replicates and sub-linear plots of five plants, totalizing 35 progenies. Diameter at breast height (DBH), plant height, cylindrical volume, stem form and survival at 24 years of age were evaluated. Significant differences among the provenances were observed only to the trait stem form. The analysis of deviance showed significant differences among progenies for the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ex situ conservation; Tropical tree species; Population genetics; Quantitative genetics Recursos genéticos florestais; Conservação genética; Genética de populações; Genética quantitativa; Melhoramento genético florestal Conservação ex situ; Espécies arbóreas tropicais; Genética de populações; Genética quantitativa. |
| Ano: 2012 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/358 |
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| Barcelos,Edson; Amblard,Philippe; Berthaud,Julien; Seguin,Marc. |
| The objective of this work was to evaluate the genetic diversity, its organization and the genetic relationships within oil palm (Elaeis oleifera (Kunth) Cortés, from America, and E. guineensis (Jacq.), from Africa) germplasm using Restriction Fragment Length Polymorphism (RFLP) and Amplified Fragment Length Polymorphism (AFLP). In complement to a previous RFLP study on 241 E. oleifera accessions, 38 E. guineensis accessions were analyzed using the same 37 cDNA probes. These accessions covered a large part of the geographical distribution areas of these species in America and Africa. In addition, AFLP analysis was performed on a sub-set of 40 accessions of E. oleifera and 22 of E. guineensis using three pairs of enzyme/primer combinations. Data were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Elaeis oleifera; Elaeis guineensis; Population genetics; Palm species; Genetic resources; Molecular chacterization. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2002000800008 |
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| Zaleski,Scheila R. M.; Lazzari,Sonia M. N.; Lazzarotto,Crisleide M.; Panzavolta,Tiziana; Iede,Edson T.; Marques,Francisco de A.. |
| Genetic structure of populations of Pissodes castaneus (De Geer) (Coleoptera, Curculionidae) using amplified fragment length polymorphism. The objective of this study was to determine the genetic structure of populations of Pissodes castaneus from different areas and on different species of Pinus using the PCR-AFLP technique. Twenty samples were analyzed, representing 19 populations from Brazil and one from Florence, Italy, which is the region of origin of P. castaneus. The four combinations of primers generated a total of 367 fragments of DNA, and 100% of polymorphic loci, indicating high degree of molecular polymorphism. The dendrogram did not reveal trends for grouping the populations in relation to origin. The low genetic similarity (0.11 between the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Banded pine weevil; Insecta; Molecular marker; Population genetics. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262013000400010 |
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| CARSON,HAMPTON L.. |
| This is a personal essay commemorating Brncic as a keen naturalist/evolutionist in the best Darwinian sense. His innate curiosity, so important in a scientist, led him to the discovery of cenain unique drosophilid flies in Chile. The life cycle of one species of flower-fly (Drosophila flavopilosa) is of special interest. Females oviposit in fresh flowers of a solanaceous plant that is widespread in Chilean valleys. Twenty years of combined ecological and genetic work, carried out on this species, pioneers the use of a highly specialized Drosophila species in the study of population genetics and evolution. Many eco-genetic features are revealed that are important supplements to observations made on the widely-studied generalist species of the genus |
| Tipo: Journal article |
Palavras-chave: Flower-breeding Drosophila; Genetic specialization; Ecology; Population genetics; Evolution. |
| Ano: 2001 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000000008 |
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| NESPOLO,ROBERTO F. |
| Evolutionary biology is experiencing an exceptional process of revisión and outreach because of the 200-anniversary if the birth of Charles Darwin. As a consequence, the study of organic evolution and also its teaching are being discussed at several levels, by evolutionary biologists, biologists and scholars outside evolutionary biology and by the general public. In this scenario, a didactic explanation of how biologists address evolutionary research in real populations seems to be useful. Using actual research examples, here I tried to outline how the classic theory (termed here as the "basic scheme") is useful to answer relevant questions in biology and how a less dogmatic paradigm (or a more versatile one) would be needed when dealing with the most... |
| Tipo: Journal article |
Palavras-chave: Character displacement; Microevolution; Modern synthesis; Natural selection; Population genetics. |
| Ano: 2010 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2010000400003 |
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| Albuquerque,Daniele Menezes; Oliveira,Carlos Antonio Lopes de; Rodriguez,Maria Del Pilar Rodriguez; Ribeiro,Ricardo Pereira. |
| ABSTRACT The aim of this study was to characterise genetic variability in five groups of Pseudoplatystoma reticulatum: Mato Grosso I (MT-I), Mato Grosso II (MT-II), Mato Grosso III (MT-III), Mato Grosso do Sul I (MS-I) and Mato Grosso do Sul II (MS-II), taken from a centre for genetic improvement. In order to determine the allelic frequency, observed heterozygosity (HO), inbreeding coefficients (FIS), Hardy-Weinberg equilibrium (HW-p) and genetic differentiation, eight polymorphic microsatellite loci (Pcor01, Pcor05, Pcor08, Pcor10, Ppu01, Ppu04, Ppu09 and Ppu10) were selected, in which a total of 62 alleles were observed in the individuals (n = 211). The MS-I population had the highest (Pcor08 allele 83: 0.5000) and lowest (Pcor10 allele 50: 0.1667) mean... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cachara; Inbreeding coefficient; Allelic Frequency; Population genetics; Microsatellites. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902020000100402 |
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| Fontes,Fernanda von Hertwig Mascarenhas; Colombo,Carlos Augusto; Lourenção,André Luiz. |
| Bemisia tabaci (Genn.) represents a complex of cryptic species that causes losses of many valuable crops. Even though there are differences in their ability to colonize hosts, transmit phytovirus and develop resistance to insecticides, the genetic differentiation of the insect populations is important for the adoption of control measures. Therefore, the genetic diversity of B. tabaci populations in economically important crops in Brazilian locations was characterized through a microsatellite analysis. Eight microsatellite markers were used for the analysis of eight populations, three in Solanum tuberosum (States of São Paulo, Minas Gerais and Bahia), two in Glycine max (States of São Paulo and Mato Grosso), one in Phaseolus vulgaris and Brassica oleracea... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: SSR; Biotype B; Population genetics; Silverleaf whitefly. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000100007 |
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| SARZI,DEISE S.; JUSTOLIN,BEATRIZ; SILVA,CLARIANE DA; LEMOS,RAFAEL P.M.; STEFENON,VALDIR MARCOS. |
| Abstract: Eugenia uniflora L. (Myrtaceae) is a tree species widely distributed in South America suffering the effects of the exploitation of natural populations. In this study, we employed low coverage sequencing of the E. uniflora genome for mining of SSR markers. The de novo assembly generated 2,601 contigs with an average length of 1139 bp and spans 3.15 Mb. A total of 76 dimer, 33 trimer and two compound SSR loci were identified. Twelve selected SSR loci were employed to genotype 30 individuals from two natural populations. A total of 73 alleles were detected (mean A= 6.1) were observed, the mean effective number of alleles was Ae = 3.91, mean Ho was 0.23 and mean HE was 0.70). The mean Wright’s within population fixation index was FIS = 0.66 and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Next generation sequencing; Pitanga; Population genetics; SSR; Surinam-cherry. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000100625 |
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| Ramirez-Gil,H.; Feldberg,E.; Almeida-Val,V.M.F.; Val,A.L.. |
| Karyological characteristics, i.e., diploid number, chromosome morphology and nucleolus organizer regions (NORs), biochemical characteristics, i.e., electrophoretic analysis of blood hemoglobin and the tissue enzymes lactate dehydrogenase (LDH), malate dehydrogenase (MDH), alcohol dehydrogenase (ADH), and phosphoglucose isomerase (PGI), and physiological characteristics, i.e., relative concentration of hemoglobin and intraerythrocytic concentrations of organic phosphates were analyzed for the species Callophysus macropterus collected from Marchantaria Island (white water system - Solimões River) and Anavilhanas Archipelago (black water system - Negro River). Karyological and biochemical data did not reveal significant differences between specimens... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Callophysus; Fish; Amazon; Population genetics; Adaptation. |
| Ano: 1998 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1998001100014 |
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| Lima,Ana Patrícia Souza de; Silva,Suzianny Maria Bezerra Cabral da; Oliveira,Karine Kelly Cavalcanti; Maggioni,Rodrigo; Coimbra,Maria Raquel Moura. |
| The shrimp industry has grown significantly over the past 10 years in Brazil, especially the farmed production of the exotic Pacific white shrimp, Litopenaeus vannamei. In 2004, this industry was marked by a productivity crisis, which stirred interest towards genetic improvement of shrimp stocks. Shrimp breeders importation was banned in Brazil by a govern Normative Instruction in 1997, as a sanitary precaution. Since then, broodstock replacement in hatcheries has been based on domestic stocks, raising concerns on the decline of genetic diversity and if the existing diversity would allow effective genetic improvement programs. In the present research, genetic parameters such as number of alleles, effective allele number, expected and observed... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Litopenaeus vannamei; Population genetics; Genetic diversity; Microsatellite. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782010000200011 |
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| Gregianini,Tatiana Schäffer; Winge,Helga. |
| ABSTRACT: Samples of 168 maté trees (Ilex paraguariensis) from four natural populations of different states of Brazil (Rio Grande do Sul, Santa Catarina, Paraná and Mato Grosso do Sul) were analyzed for their variability in storage proteins seed, which were used to estimate the degree of differentiation among and within species, because are relatively stable during evolution. Data on band presence/absence from 80 different polypeptides were used to perform similarity coefficient of Jaccard. A high level of genetic variability was reported within sampled populations (SJ intra=0.374). Lower levels of diversity were observed between populations (SJ inter=0.308). Total genetic diversity of maté was Hsp=0.264 estimated by Shannon measure. Partition of that... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: ‘chimarrão’; Germoplasm banks; Population genetics. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782019000200750 |
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| Registros recuperados: 117 | |
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