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2n Gamete formation in the genus Brachiaria (Poaceae: Paniceae). Repositório Alice
GALLO, P. H; MICHELETTI, P. L.; BOLDRINI, K. R.; RISSO-PASCOLOTTO, C.; PAGLIARINI, M. S.; VALLE, C. B. do..
Microsporogenesis of several Brachiaria species of the Brazilian collection at Embrapa Beef Cattle has been analyzed in detail. This paper reports abnormal cytokinesis in three accessions of three different species (Brachiaria humidicola, 2n = 4x = 36, Brachiaria decumbens, 2n = 4x = 36, and Brachiaria dura, 2n = 6x = 54). Chromosomes paired in bi-, tri-, and quadrivalents in these accessions, whereas chromosome segregation at meiosis I was characterized by exclusion of laggards as micronuclei. In a high number of meiocytes, the first sign of cytokinesis appeared only in metaphase II and did not divide the meiocyte into a dyad. Total absence of cytokinesis was also detected among meiocytes in the second division. Since in both cases the two metaphase...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Melhoramento genético vegetal; Citogenética vegetal; Poliploidia; Planta Forrageira; Gramínea forrageira; Braquiária; Brachiaria humidicola; Brachiaria decumbens; Brachiaria dura; Campo Grande; Mato Grosso do Sul; Brasil; Plant breeding; Cytogenetics; Polyploidy; Feed crops; Feed grasses; Brazil.
Ano: 2007 URL: http://www.alice.cnptia.embrapa.br/handle/doc/326409
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A multi-approach analysis of the genetic diversity in populations of Astyanax aff. bimaculatus Linnaeus, 1758 (Teleostei: Characidae) from Northeastern Brazil Neotropical Ichthyology
Pamponet,Vanessa de Carvalho Cayres; Carneiro,Paulo Luiz Souza; Affonso,Paulo Roberto Antunes de Mello; Miranda,Viviam Souto; Silva Júnior,Juvenal Cordeiro; Oliveira,Claudine Gonçalves de; Gaiotto,Fernanda Amato.
Few reports are available about the ichthyofauna of typical semi-arid rivers, although the regional diversity has been constantly threatened by human activities, mainly related to impoundment and construction of dams. The goal of the present work was to evaluate using different methods, the population genetic structure of a characin fish, Astyanax aff. bimaculatus, widespread throughout hydrographic basins of Bahia, Northeastern Brazil. Morphological (meristic and morphometric data), cytogenetic (karyotype and Ag-NOR), and molecular (RAPD and SPAR) analyses were carried out in specimens collected upstream and downstream of Pedra Dam, in the main channel of Contas River (Contas River Basin), and in the Mineiro stream, which belongs to the adjacent Recôncavo...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Morphometry; Cytogenetics; RAPD; Population structure; Contas River.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252008000400010
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A new species of Urostreptus (Diplopoda, Spirostreptidae): description and chromossome number Iheringia, Sér. Zool.
Pierozzi,Pedro H. B.; Fontanetti,Carmem S..
This work presents the description and chromosome number of Urostreptus atrobrunneus sp. nov. The genus until now had not been registered yet in the São Paulo State, Brazil. The meiotic analysis showed that the species presents 2n=24, XY. The C-banding revealed large blocks of constitutive heterochromatin and two heteromorphic chromosomal pairs, one of them corresponding to the sexual pair.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Urostreptus; Diplopoda; Cytogenetics; Banding.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212006000200011
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A remarkable autosomal heteromorphism in Pseudoryzomys simplex 2n = 56; FN = 54-55 (Rodentia, Sigmodontinae) Genet. Mol. Biol.
Moreira,Camila Nascimento; Di-Nizo,Camilla Bruno; Silva,Maria José de Jesus; Yonenaga-Yassuda,Yatiyo; Ventura,Karen.
Pseudoryzomys simplex, the false rice rat, is a monotypic genus of the Oryzomyini tribe (Sigmodontinae) distributed in part of Bolivia, Paraguay, Argentina and Brazil. Its diploid number has been described as 56 acrocentric chromosomes decreasing in size and no karyotype figure has been depicted. Herein, we present karyotypic data on P. simplex, including chromosome banding and molecular fluorescent in situ hybridization using telomeric sequences and the whole X-chromosome of its sister clade Holochilus brasiliensis (HBR) as probes. A case of remarkable autosomal heteromorphism due to the presence of a whole heterochromatic arm leading to the variability of FN is reported, as well as the occurrence of regions of homology between the X and Y chromosomes...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cytogenetics; Fluorescent in situ hybridization; Heterochromatin; Oryzomyini.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572013000200010
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Abnormal cytokinesis in microsporogenesis of Brachiaria humidicola (Poaceae: Paniceae). Repositório Alice
ADAMOWSKI, E. V.; BOLDRINI, K. R.; PAGLIARINI, M. S.; VALLE, C. B. do.
Microsporogenesis was evaluated in the Brachiaria humidicola collection of the Embrapa Beef Cattle Center, represented by 60 acessions. One acession (H121) presented an abnormal pattern of cytokinesis that had never been reported in this genus. Among 900 meiocytes analyzed in the first division, 10.7% underwent precocious and multiple cytokinesis in metaphase I, fractionating the genome and the cytoplasm into two or more parts. The expected cytokinesis after telophase I did not occur. The abnormal meiocytes from the first division entered the second division but the second cytokinesis after telophase II was also abnormal. Among the 857 meiocytes analyzed in the second division, 10.9% presented abnormal, incomplete or total absence of cytokinesis. Dyads and...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Braquiária; Brachiaria humidicola; Citocinese; Campo Grande; Mato Grosso do Sul; Brasil; Feed crops; Feed grasses; Citokinesis; Brazil; Melhoramento genético vegetal; Citogenética vegetal; Planta Forrageira; Brachiaria humidicola; Meiose; Plant breeding; Cytogenetics.
Ano: 2007 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/326647
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Abnormal meiotic behavior in three species of Crotalaria. Repositório Alice
FERREIRA, K.; TORRES, G. A.; CARVALHO, I. V. de; DAVIDE, L. C..
Abstract - The objective of this work was to compare the meiotic behavior and pollen grain viability of three species of Crotalaria. Slides for meiotic analysis were prepared by the air-drying technique. Pollen grain viability was measured by three staining procedures (Alexander's solution, tetrazolium chloride and fluorescein diacetate) and in vitro germination in a sucrose solution. Eight bivalents were observed, confirming previous reports on populations from other regions of Brazil, as well as from other countries. All species showed abnormal meiotic behavior as follows: in Crotalaria micans, cytomixis and abnormal chromosome pairing in diakinesis; in C. spectabilis, abnormal chromosome pairing in diplotene; in C. zanzibarica, shrunk nuclei in...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Cytomixis; Pollen grain viability; Crotalaria; Cytogenetics; Meiosis.
Ano: 2009 URL: http://www.alice.cnptia.embrapa.br/handle/doc/662399
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Abnormal meiotic behavior in three species of Crotalaria PAB
Ferreira,Kátia; Torres,Giovana Augusta; Carvalho,Isabelle Vilela de; Davide,Lisete Chamma.
The objective of this work was to compare the meiotic behavior and pollen grain viability of three species of Crotalaria. Slides for meiotic analysis were prepared by the air-drying technique. Pollen grain viability was measured by three staining procedures (Alexander's solution, tetrazolium chloride and fluorescein diacetate) and in vitro germination in a sucrose solution. Eight bivalents were observed, confirming previous reports on populations from other regions of Brazil, as well as from other countries. All species showed abnormal meiotic behavior as follows: in Crotalaria micans, cytomixis and abnormal chromosome pairing in diakinesis; in C. spectabilis, abnormal chromosome pairing in diplotene; in C. zanzibarica, shrunk nuclei in leptotene and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Crotalaria; Cytogenetics; Cytomixis; Meiosis; Pollen grain viability.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2009001200012
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Adaptação metodológica de citogenética pra minhocas. Repositório Alice
TIMM, V. F.; ROCHA, M. P.; ZEFA, E.; SCHIEDECK, G..
O objetivo do presente trabalho foi testar diferentes técnicas citogenéticas em minhocas da espécie Eisenia andrei Bouché, no intuito de estabelecer uma diretriz para novos estudos que proporcionem a obtenção de material com maior número de metáfases com menos custo e tempo de desenvolvimento.
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Metafase; Citogenética; Minhoca; Cytogenetics; Earthworm; Metaphase.
Ano: 2012 URL: http://www.alice.cnptia.embrapa.br/handle/doc/946959
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American marsupials chromosomes: why study them? Genet. Mol. Biol.
Svartman,Marta.
Marsupials, one of the three main groups of mammals, are only found in Australia and in the American continent. Studies performed in Australian marsupials have demonstrated the great potential provided by the group for the understanding of basic genetic mechanisms and chromosome evolution in mammals. Genetic studies in American marsupials are relatively scarce and cytogenetic data of most species are restricted to karyotype descriptions, usually without banding patterns. Nevertheless, the first marsupial genome sequenced was that of Monodelphis domestica, a South American species. The knowledge about mammalian genome evolution and function that resulted from studies on M. domestica is in sharp contrast with the lack of genetic data on most American...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Marsupials; Cytogenetics; Chromosome evolution.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572009000400002
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Analise citogenetica de suínos intersexuados. Repositório Alice
TAMBASCO, A.J.; FERRARI, I.; SCHEID, I.R.; MORAES, N.; LAUS, J.G..
Esclarecer a etiologia da interssexualidade devido aos fatores geneticos, foram observados os produtos de 350 fêmeas em um plantel suíno, nascidos num período de 11 meses.
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: Biologia; Citogenética; Cariotipo; Cromossomica; Biology; Cytogenetics; Chromosome aberration.
Ano: 1985 URL: http://www.alice.cnptia.embrapa.br/handle/doc/42779
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Analysis of nuclear DNA content and chromosome number for screening genotypes and crosses in Annual Ryegrass (Lolium multiflorum Lam.). Repositório Alice
BUSTAMANTE, F. de O.; ROCHA, L. C.; SANTOS, N. de S.; SILVEIRA, R. A. D.; NUNES, R. de C.; MITTELMANN, A.; TECHIO, V. H..
2015
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Annual ryegrass; Cytogenetics; Flow cytometry; Plant breeding; Polyploidy.
Ano: 2015 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1034882
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Arachis hoehnei, the probable B genome donor of Arachis hypogaea based on crossability, cytogenetical and molecular studies Open Agri
Mallikarjuna, N..
Palavras-chave: Genomes; Hybrids; Polyploidy; Cytogenetics; DNA; Groundnuts; Mosses; Genetic polymorphism; Polymorphism; Genetic improvement.
Ano: 2006 URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3177
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Avaliação da microsporogênese em híbridos sexuais de Brachiaria (Poaceae). Repositório Alice
PAGLIARINI, M. S.; FUZINATTO, V. A.; VALLE, C. B. do..
2007
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Melhoramento genético vegetal; Citogenética vegetal; Brachiaria; Braquiária; Híbrido; Plant breeding; Cytogenetics; Hybrids.
Ano: 2007 URL: http://www.alice.cnptia.embrapa.br/handle/doc/323987
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Biosystematic and chemosystematic studies in five South American species of Conyza (Asteraceae) Boletín de la Sociedad
Urdampilleta,Juan D.; Amat,Aníbal G.; Bidau,Claudio J.; Kolb Koslobsky,Nicolás.
The composition of the essentials oils of five species of Conyza Less from Argentina was determined by Gas Chromatography-Mass Spectrometer. This composition is associated to morphological and cytogenetic characters. The monoterpenes constitute more than 60% of the essential oils in C. blakei, C glandulitecta, C. sumatrensis var. sumatrensis and C. sumatrensis var. floribunda, in which limonene is the predominant compound. In C. bonariensis and C. primulaefolia the monoterpene content constitute less than the 40%. C. bonariensis presents only 13% limonene, while in C. primulaefolia it is absent. The similarity analysis of monoterpenes showed a relationship between the morphological and cytogenetic analysis, and the monoterpene content character seems to be...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Essential oils; Chemosystematics; Morphology; Cytogenetics; Conyza; Asteraceae.
Ano: 2005 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-23722005000100011
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Caracterização citogenética de acessos de Brachiaria brizantha (Gramineae). Infoteca-e
MENDES-BONATO, A. B.; VALLE, C. B. do; PAGLIARINI, M. S.; PENTEADO, M. I. de O..
No gênero Brachiaria, muitas espécies e acesso são poliplóides e apomíticos, o que dificulta o melhoramento via hibridização. Uma ampla caracterização citogenética, incluindo determinação do número de cromossomos e avaliação detalhada do comportamento meiótico, vem sendo realizada na coleção de germoplasma deste gênero a fim de auxiliar na seleção de genitores e explicar problemas na fecundidade dos acessos e híbridos do programa de melhoramento desenvolvido pela Embrapa Gado de Corte. Neste estudo, 22 acessos de Brachiaria brizantha foram analisados. Destes, um é diplóide (2n = 2x = 18), 18 são tetraplóides (2n = 6x = 54). Anormalidades meióticas variaram de 2,85% a 5,55% nas células em divisão no acesso diplóide e de 1,03% a 69,48% nos acessos...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E) Palavras-chave: Brachiaria brizantha; Citogenética vegetal; Apomixia; Cromossoma; Poliploidia; Cytogenetics; Polyploidy.
Ano: 2002 URL: http://www.infoteca.cnptia.embrapa.br/handle/doc/325562
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Chromosomal analyses in Megalonema platanum (Siluriformes: Pimelodidae), an endangered species from South American rivers Neotropical Ichthyology
Carvalho,Rafael Augusto de; Sanchez,Sebástian; Swarça,Ana Claudia; Fenocchio,Alberto Sergio; Martins-Santos,Isabel C.; Dias,Ana Lúcia.
This study presents chromosomal data of Megalonema platanum from rio Tibagi, Paraná, Brazil and from rio Paraná, Argentina. The diploid number was equal 54 with karyotype composition of 24m+16sm+2st+12a in both populations. The AgNOR sites were detected in the terminal position of a submetacentric pair of the two analyzed populations, coinciding with secondary constrictions on the short arm of pair 15. CMA3 and FISH with 18S rDNA probe displayed fluorescent signals that correspond to the AgNOR sites and secondary constriction. The presence of a small acrocentric supernumerary chromosome can be observed in M. platanum from rio Tibagi, with centromeric heterochromatin. Others heterochromatic blocks were evidenced in the terminal position of some chromosome...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cytogenetics; C-banding; CMA3; FISH; NORs; Pimelodidae.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252011000100017
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Chromosomal basis for a bilateral gynandromorph in Pycnogaster inermis (Rambur, 1838) (Orthoptera, Tettigoniidae) Naturalis
Barranco, P.; Cabrero, J.; Camacho, J.P.M.; Pascual, F..
Morphological and cytogenetic analyses of a spontaneous gynandromorph of Pycnogaster inermis, found in a natural population in the Spanish Sierra Nevada, have shown that the left side was male and the right side female, with almost perfect bilateral symmetry. Ventral valves of the ovipositor were very short, appearing as two spurs; dorsal valves were longer but still shorter than normal. The specimen had an apparently normal testis on the left side and a well-developed ovary on the right side. Cytogenetic analysis revealed the presence of 2n = 28 + X0 chromosomes in the testis and 2n = 28 + XX in the ovary, the same as standard males and females, respectively, of this species. This suggests that the gynandromorphism occurred at a very early developmental...
Tipo: Article / Letter to the editor Palavras-chave: Gynandromorphism; Cytogenetics; Pycnogaster inermis; Tettigoniidae; Orthoptera.
Ano: 1995 URL: http://www.repository.naturalis.nl/record/504051
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Chromosomal characterization of Amazonian freshwater stingrays with evidence for new karyomorphs and XX/XY sex chromosomes Genet. Mol. Biol.
Valentim,Francisco Carlos de Souza; Porto,Jorge Ivan Rebelo; Feldberg,Eliana.
Abstract Cytogenetic studies in the subfamily Potamotrygoninae have provided valuable insights into the understanding of the evolution and diversification of its species. In the present study, the chromosomal features of seven nominal potamotrygonin species are provided: Plesiotrygon iwamae (2n=74, FN=120), Potamotrygon amazona (2n=66, FN=107), P. constellata (2n=66, FN=110), P. leopoldi (2n=64, FN=102), P. motoro (2n=66, FN=106) from four different localities, and P. orbignyi (2n=66, FN=106), P. scobina (2n=66, FN=104), from Central Amazon. Additionally, we found a new karyomorph in P. wallacei. We considered the localization of Nucleolus Organizer Regions (NORs), as well as the pattern of constitutive heterochromatin, as species-specific characters. We...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Elasmobranchs; Cytogenetics; Chromosomal rearrangements; Sex chromosomes; Karyotypic diversity.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572019000400578
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Chromosomal characterization of Pseudonannolene strinatii (Spirostreptida, Pseudonannolenidae) Iheringia, Sér. Zool.
Campos,Kleber Agari; Fontanetti,Carmem S..
The chromosomes of the cave millipede Pseudonannolene strinatii Mauriès, 1974 were investigated. The diploid chromosome number was found to be 2n=16, XX/XY; the C-banding technique revealed a large amount of heterochromatin while the silver staining technique (Ag-NOR) evidenced the presence of heteromorphism of the NORs in some cells.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Diplopoda; Cytogenetics; Caves; Heterochromatin.
Ano: 2004 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212004000100009
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Chromosomal differentiation in Kerodon rupestris (rodentia: caviidae) from the brazilian semi-arid region Mastozool. neotrop.
Lessa,Gisele; Corrêa,Margaret M. O; Pessôa,Leila M; Zappes,Ighor A.
Kerodon rupestris (Wied, 1820) is the most specialized species among caviid rodents and is endemic to the extensive rocky outcrops in the semi-arid region in Brazil. Herein we describe different karyotypes for K. rupestris, based on samples collected in Itapajé, Ceará (CE), Iraquara in Bahia (BA), and Botumirim in Minas Gerais (MG). Our samples included northern, center and southern populations in the range of the species dis­tribution. The results were compared with a karyotype from Pernambuco previously described for the species. The diploid number (2n = 52) was constant among the analyzed population samples, but the fundamental number (FN) varied from 92 in Itapajé (CE) and Iraquara (BA), to 94 in Botumirim (MG). Pericentric inversions affecting one...
Tipo: Info:eu-repo/semantics/report Palavras-chave: C-Bands; Cytogenetics; Kerodon rupestris; NOR.
Ano: 2013 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-93832013000200013
Registros recuperados: 108
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