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	Provedor de dados Genet. Mol. Biol. (5) Trop. Plant Pathol. (1) Autor Abril,Vanessa Veltrini (1) Carvalho,Cláudia (1) Castilho,Camila S. (1) Collares-Pereira,Maria João (1) Davide,Lisete C. (1) Duarte,José Maurício Barbanti (1) Freitas,Thales R.O. de (1) Galetti Jr.,Pedro Manoel (1) Gava,Adriana (1) Melo,Natoniel Franklin de (1) Mendes-Costa,Maria C. (1) Molina,Wagner Franco (1) Monteiro,Rita (1) Moura,Rita de Cássia de (1) Roca M.,M. Gabriela (1) Shibatta,Oscar (1) Souza,Maria José de (1) Mais... Palavra-chave Chromosome polymorphism (6) Ag/CMA3-banding (1) Anostomidae (1) Brazilian dwarf brocket deer (1) C-banding (1) Centric fusions (1) Characiformes (1) Conidia cytogenetics (1) Cytogenetics (1) Flow cytometry (1) Heterochromatin (1) Karyotypes (1) Mazama nana (1) Microsatellite (1) Multiple sex system (1) NOR (1) NORs (1) RDNA (1) Spontaneous triploidy (1) Subterranean rodent (1) Mais... Tipo do documento Info:eu-repo/semantics/article (6) Ano 2012 (1) 2009 (1) 2008 (3) 2003 (1) País Brazil (6) Idioma Inglês (6)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 6 Primeira ... 1 ... Última A hybrid zone of the genus Ctenomys: a case study in southern Brazil Genet. Mol. Biol. Castilho,Camila S.; Gava,Adriana; Freitas,Thales R.O. de. We describe variation at microsatellite loci and the chromosomal polymorphisms of a hybrid population, and hybridizing populations of Ctenomys minutus (the minor tuco-tuco) from the coastal plain of Rio Grande do Sul, southern Brazil. Cytogenetic analysis and a survey of six microsatellite loci included 101 specimens of C. minutus from the parental populations (2n/AN = 42/74 and 48a/76) and their contact zone. Cytogenetic analysis recorded 26 different karyotypes exhibited by 50 individuals from the hybrid population. Of the 26 karyotypes, only 14% presented a parental-like configuration, and none had the combinations of 2n and AN expected for an F1 hybrid. The remaining karyotypes were alternative hybrid forms, with 2n varying from 42 to 46 and AN from 68... Tipo: Info:eu-repo/semantics/article Palavras-chave: Chromosome polymorphism; Subterranean rodent; Karyotypes; Microsatellite. Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572012000600014 Chromosomal evidence of population subdivision in the freshwater fish Leporinus elongatus in the Upper Paraná River basin Genet. Mol. Biol. Molina,Wagner Franco; Shibatta,Oscar; Galetti Jr.,Pedro Manoel. Cytogenetic analyses performed in populations of the Neotropical freshwater fish Leporinus elongatus of the Upper Paraná River basin showed a chromosome polymorphism involving heterochromatic segments of the nucleolar organizing pair in this species. The NOR-bearing chromosome pair was characterized by two phenotypes identified by the absence (C¹) or presence (C²) of a heterochromatic segment located in an interstitial position of the long arm in this pair. The meiotic segregation of these variations results in three distinct cytotypes, C¹C¹, C¹C² and C²C². Both populations were in Hardy-Weinberg equilibrium. Sex-related cytotype divergence was identified and multivariate analyses revealed that the C²C² individuals presented morphometric differentiation... Tipo: Info:eu-repo/semantics/article Palavras-chave: Characiformes; Anostomidae; Heterochromatin; Chromosome polymorphism. Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572008000200020 Chromosome polymorphism in the Brazilian dwarf brocket deer, Mazama nana (Mammalia, Cervidae) Genet. Mol. Biol. Abril,Vanessa Veltrini; Duarte,José Maurício Barbanti. The Brazilian dwarf brocket deer (Mazama nana) is the smallest deer species in Brazil and is considered threatened due to the reduction and alteration of its habitat, the Atlantic Rainforest. Moreover, previous work suggested the presence of intraspecific chromosome polymorphisms which may contribute to further population instability because of the reduced fertility arising from the deleterious effects of chromosome rearrangements during meiosis. We used G- and C-banding, and nucleolus organizer regions localization by silver-nitrate staining (Ag-NOR) to investigate the causes of this variation. Mazama nana exhibited eight different karyotypes (2n = 36 through 39 and FN = 58) resulting from centric fusions and from inter and intraindividual variation in... Tipo: Info:eu-repo/semantics/article Palavras-chave: Mazama nana; Brazilian dwarf brocket deer; Cytogenetics; Chromosome polymorphism; Centric fusions. Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572008000100011 Cytogenetics of Colletotrichum lindemuthianum (Glomerella cingulata f. sp. phaseoli) Trop. Plant Pathol. Roca M.,M. Gabriela; Davide,Lisete C.; Mendes-Costa,Maria C.. Cytogenetic and morphological studies were conducted with Colletotrichum lindemuthianum (Glomerella cingulata f. sp. phaseoli), the pathogen responsible for anthracnose of common bean (Phaseolus vulgaris). In this species, there is some evidence of genomic variation but it is unknown whether the process occurs in a manner similar to other fungal genetic models. Six isolates from bean plants were used and sexual reproduction was observed in vitro. Meiosis and ascospore formation were investigated by cytogenetical approaches and light microscopy. To study the nucleus and chromosome numbers, a mixture of carmine and orcein propionic dyes was used. Nucleus divisions as well as ascospore maturation were asynchronous. Meiosis was observed in three isolates. In... Tipo: Info:eu-repo/semantics/article Palavras-chave: Conidia cytogenetics; Chromosome polymorphism. Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582003000400004 High levels of chromosomal differentiation in Euchroma gigantea L. 1735 (Coleoptera, Buprestidae) Genet. Mol. Biol. Moura,Rita de Cássia de; Melo,Natoniel Franklin de; Souza,Maria José de. Euchroma gigantea was karyotypically studied using conventional staining, C-banding, silver nitrate staining and ribosomal fluorescent in situ hybridization (rDNA FISH). Broad wide autosomal polymorphism and a complex sex determination system were found in this beetle. Karyotype complements ranging from 2n = 32, X1X2X3Y1Y2Y3 to 2n = 36,X1X2X3Y1Y2Y3 were detected in the sample analyzed. Punctiform supernumerary chromosomes were present in the different karyotypes. The karyotypic evolution of Brazilian E. gigantea may have taken two directions, reduction in the diploid number of 2n = 36 to 24 through centric fusions or 2n = 24 to 36 due to chromosomal fissions. In addition, pericentric inversions were also involved. The complex multiple sex mechanism of this... Tipo: Info:eu-repo/semantics/article Palavras-chave: Chromosome polymorphism; C-banding; Multiple sex system; NOR; RDNA. Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572008000300007 Karyotype and genome size of Iberochondrostoma almacai (Teleostei, Cyprinidae) and comparison with the sister-species I. lusitanicum Genet. Mol. Biol. Monteiro,Rita; Carvalho,Cláudia; Collares-Pereira,Maria João. This study aimed to define the karyotype of the recently described Iberian endemic Iberochondrostoma almacai, to revisit the previously documented chromosome polymorphisms of its sister species I. lusitanicum using C-, Ag-/CMA3 and RE-banding, and to compare the two species genome sizes. A 2n = 50 karyotype (with the exception of a triploid I. lusitanicum specimen) and a corresponding haploid chromosome formula of 7M:15SM:3A (FN = 94) were found. Multiple NORs were observed in both species (in two submetacentric chromosome pairs, one of them clearly homologous) and a higher intra and interpopulational variability was evidenced in I. lusitanicum. Flow cytometry measurements of nuclear DNA content showed some significant differences in genome size both... Tipo: Info:eu-repo/semantics/article Palavras-chave: Ag/CMA3-banding; Flow cytometry; NORs; Chromosome polymorphism; Spontaneous triploidy. Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572009000200011 Registros recuperados: 6 Primeira ... 1 ... Última

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