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| Registros recuperados: 94 | |
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| Paiz,Leonardo M.; Baumgärtner,Lucas; Graça,Weferson J. da; Margarido,Vladimir P.; Pavanelli,Carla S.. |
| ABSTRACT We provide cytogenetic data for the threatened species Gymnogeophagus setequedas, and the first record of that species collected in the Iguaçu River, within the Iguaçu National Park’s area of environmental preservation, which is an unexpected occurrence for that species. We verified a diploid number of 2n = 48 chromosomes (4sm + 24st + 20a) and the presence of heterochromatin in centromeric and pericentromeric regions, which are conserved characters in the Geophagini. The multiple nucleolar organizer regions observed in G. setequedas are considered to be apomorphic characters in the Geophagini, whereas the simple 5S rDNA cistrons located interstitially on the long arm of subtelocentric chromosomes represent a plesiomorphic character. Because G.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Chromosomes; Conservation; Iguaçu River; Karyotype; Paraná River. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252017000200211 |
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| Targueta,Cíntia Pelegrineti; Guerra,Vinícius; Gambale,Priscilla Guedes; Bastos,Rogério Pereira; Silva,Daniela de Melo e; Telles,Mariana Pires de Campos. |
| Abstract Cytogenetic data can be useful for taxonomic and phylogenetic studies, as well as to provide information about chromosome evolution. Therefore, it may help design conservation priorities for some threatened species, such as anurans. Herein, we describe the karyotypes of Scinax constrictus and Ololygon centralis, native endemic species from the Brazilian Cerrado. Chromosome preparations for both species were stained with Giemsa for morphological analyses and then impregnated by the Ag-NOR method for localization of the nucleolar organizer region (NOR). Both species had 24 chromosomes, as confirmed by meiotic analyses, which showed 12 bivalents. Chromosome morphologies presented the same pattern for Scinax and Ololygon compared to species already... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Anura; Karyotype; Ololygon; Scinax. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572018000500814 |
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| Ferreira,Amilton; Mesa,Alejo. |
| The thirteen species of Phaneropterinae here studied can be arranged in four different groups according to their basic karyological traits. All of them share the same kind of chromosomal sex determining mechanism with X0(male) and XX(female). The X chromosome differs among species and always appears heteropycnotic during prophase I, it is the largest in the set and segregates precociously during anaphase I. Among the species, the karyotypes varies in fundamental number between 31 to 21. The meaning of these significant changes in the karyotypes in relation to the phylogeny within some large taxonomic group of species is discussed. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Karyotype; Chromosome; Evolution. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2007000400003 |
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| Baeza,Carlos M.; Finot,Víctor; Ruiz,Eduardo; Carrasco,Pedro; Novoa,Patricio; Rosas,Marcelo; Toro-Núñez,Oscar. |
| Abstract Alstroemeria L. (Alstroemeriaceae) represents one of the most diverse genera of vascular plants in Chile. It contains approximately 54 taxa, 40 of which are endemic. The “complex” Alstroemeria magnifica is endemic to Chile, and it comprises four varieties: A. magnifica var. magenta, A. magnifica var. magnifica, A. magnifica var. sierrae, and A. magnifica var. tofoensis. It is distributed from Coquimbo to the Valparaíso Region. We analyzed karyotypes of 10 populations along its natural distribution. All the populations presented an asymmetric karyotype, with 2n = 16 chromosomes but with three different karyotypic formulae. Alstroemeria magnifica var. magnifica and A. magnifica var. sierrae presented the same karyotypic fomula, and A. magnifica var.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Alstroemeria; Karyotype; Species complex; Asymmetry; Chile. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572018000300434 |
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| Benzaquem,Denise Corrêa; Feldberg,Eliana; Porto,Jorge Ivan Rebelo; Gross,Maria Claudia; Zuanon,Jansen Alfredo Sampaio. |
| Karyotypes of six cichlid species of the genus Crenicichla were investigated. The species C. cincta, C. inpa, C. reticulata, C. lugubris, and C. cf. johanna were collected from Amazon basin, and C. britskii was collected from the Paraná-Paraguai basin. All of the analysed species showed 2n = 48 chromosomes; however, C. cincta, C. lugubris, C. cf. johanna, and C. britskii had a karyotype formula of 8M-SM+40ST-A, FN = 56, while C. inpa and C. reticulata exhibited the formula 6M-SM+42ST-A, FN = 54. Analysis of active Ag-NORs revealed two NOR-bearing chromosomes in all species; however, theses cistrons were located on different chromosome pairs and/or in different chromosome locations in each species. This condition bears evolutionary significance, since it is... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Karyotype; Pike cichlid; Chromosome marker; Amazon. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572008000200016 |
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| Tavares,Mara Garcia; Carvalho,Carlos Roberto; Soares,Fernanda Aparecida Ferrari; Fernandes,Anderson. |
| When working at quantifying the genome size of stingless bees, it was observed that males of Lestrimelitta sp possessed the same amount of nuclear DNA as the females. Thus, we used flow cytometry (FCM) and cytogenetic analysis to confirm the ploidy of these individuals. The males analyzed proved to be diploid, since, through cytometric analysis, it was demonstrated that the mean genome size of both males and females was the same (C = 0.463 pg), and, furthermore, cytogenetic analysis demonstrated that both had 2n = 28 chromosomes. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cytogenetic; Flow cytometry; Genome size; Karyotype; Stingless bee. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572010000300019 |
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| Leitao, Alexandra; Boudry, Pierre; Thiriot Quievreux, Catherine. |
| The G-banding technique was performed on aneuploid karyotypes from gill tissue of the Pacific oyster, Crassostrea gigas, to assess whether chromosome losses could be explained by differential chromosomal susceptibility and to clarify the negative correlation between aneuploidy and growth rate previously reported in different populations of this oyster. The study of 95 G-banded aneuploid karyotypes showed that only 4 of the 10 chromosome pairs (viz. 1, 5, 9, and 10) of C. gigas were affected by the loss of one homologous chromosome. Pairs 1, 9, and 10, which were lost in 56, 33, and 44% of cases, respectively, may be considered to be differentially affected. Hypotheses on this differential chromosomal susceptibility are discussed. |
| Tipo: Text |
Palavras-chave: Oyster; Karyotype; G banding; Growth; Aneuploidy; Huître; Caryotype; Bandes G; Croissance; Aneuploïdie. |
| Ano: 2001 |
URL: http://archimer.ifremer.fr/doc/2001/publication-742.pdf |
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| Swarça,Ana Claudia; Orsi,Mário Luis; Takagui,Fábio Hiroshi; Dias,Ana Lucia; Dergam,Jorge Abdala; Fenocchio,Alberto Sérgio. |
| ABSTRACT The present report represents the first cytogenetic description of Steindachneridion doceanum, great catfish which is currently at high extinction risk and it is listed as threatened on the red list of the Brazilian Ministry of the Environment, also are suggested karyotype relationships with other species of the same genus endemic from other river basins. The results revealed a diploid number of 2n = 56 and the karyotype composed of 18 metacentric, 20 submetacentric, 10 subtelocentric and 8 acrocentric chromosomes (NF = 104). The AgNORs and CMA3 signals were coincident in location occupying the short arm of an acrocentric chromosome pair (25th), in a secondary constriction. The 5S rDNA genes were localized on the short arms of one subtelocentric... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: AgNORS; C band; Karyotype; South American Catfish; Threatened species. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252018000400203 |
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| Paim,Fabilene Gomes; Brandão,José Henrique Souza Galdino; Sampaio,Iracilda; Affonso,Paulo Roberto Antunes de Mello; Diniz,Débora. |
| Parrotfishes (Labridae, Scarinae) comprise a large marine fish group of difficult identification, particularly during juvenile phase when the typical morphology and coloration of adults are absent. Therefore, the goal of this study was to test cytogenetic markers and DNA barcoding in the identification of bucktooth parrtotfish Sparisoma radians from the northeastern coast of Brazil. Sequencing of cytochrome c oxidase subunit I (COI) confirmed all studied samples as S. radians, and all showed high similarity (99-100%) with Caribbean populations. The karyotype of this species was divergent from most marine Perciformes, being composed of 2n = 46 chromosomes. These consisted of a large number of metacentric and submetacentric pairs with small amounts of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: COI; Karyotype; South Atlantic fish; Ribossomal genes; Robertsonian rearrangements. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572014000500007 |
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| Laguna,Marcia Maria; Amaro,Renata Cecília; Mott,Tamí; Yonenaga-Yassuda,Yatiyo; Rodrigues,Miguel Trefaut. |
| The karyotype of Amphisbaena ridleyi, an endemic species of the archipelago of Fernando de Noronha, in State of Pernambuco, Brazil, is described after conventional staining, Ag-NOR impregnation and fluorescence in situ hybridization (FISH) with a telomeric probe. The diploid number is 46, with nine pairs of macrochromosomes (three metacentrics, four subtelocentrics and two acrocentrics) and 14 pairs of microchromosomes. The Ag-NOR is located in the telomeric region of the long arm of metacentric chromosome 2 and FISH revealed signals only in the telomeric region of all chromosomes. Further cytogenetic data on other amphisbaenians as well as a robust phylogenetic hypothesis of this clade is needed in order to understand the evolutionary changes on... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Amphisbaena ridleyi; Karyotype; Fernando de Noronha; Ag-NOR; FISH with telomeric probes. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572010000100011 |
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| Registros recuperados: 94 | |
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