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Registros recuperados: 25
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Botanical aspects of Heteropterys umbellata (Malpighiaceae): a cytological and palynological approach Anais da ABC (AABC)
Sousa,Saulo M.; Reis,Aryane C.; Gomes,Shaiany S.L.; Bernardo,Karina B.; Salimena,Fátima R.G.; Viccini,Lyderson F..
The genus Heteropterys is one of the major genera in Malpighiaceae. However, few cytological and palynological studies were reported. The present work described for the first time the chromosome number, heterochromatin pattern, meiotic behavior, pollen viability and palynological aspects of Heteropterys ubellata, a very spread species. One large Brazilian population was evaluated using conventional techniques for meiotic studies and acetolyse to access the pollen morphology. The species showed 2n = 20 chromosomes, normal meiotic development and viable pollens. Great blocks of heterochromatin were observed around the centromers. DAPI staining was positive for centroeric heterochroatin, hile CMA3 ark as observed just at terinal regions of one pair of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Chromosome number; Heterochromatin pattern; Heteropterys umbellata; Malpighiaceae; Meiosis; Pollen viability.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000400009
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Chilean plants cytogenetic database: coverage, features and usages JBAG
Jara-Seguel,Pedro; Urrutia-Estrada,Jonathan.
Chilean Plants Cytogenetic Database (CPCD) is a resource available on line in electronic format, which provides a cytogenetics catalogue for continental and insular Chilean vascular plants. In this report, we made reference to the CPCD, discussing aspects on its coverage, features and usages. Currently, the database stores cytogenetic information for 247 species, 107 genera, and 55 families belonging to Pteridophyta, Pinophyta, and Magnoliophyta.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Chromosome number; Karyotype; Chilean Plants.
Ano: 2018 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1852-62332018000100006
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Chromosome number and microsporogenesis in Paspalum maritimum (caespitosa group; gramineae) BABT
Adamowski,Eleniza de Victor; Pagliarini,Maria Suely; Batista,Luiz Alberto Rocha.
Despite of economic importance of the genus Paspalum, little or no cytologic information is available for many species. This is the first report about chromosome number and meiotic behavior for P. maritimum. The three accessions collected in Amapá State (North Region of Brazil) were tetraploid (2n=4x=40) with the chromosomes associating predominantly as bivalents. The low frequency of multivalents suggested that they were segmental allotetraploids. All accessions showed a low rate of meiotic irregularities, and as a consequence the pollen fertility was high. The results suggested that these accessions presented potential for use in a hybridization program.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Paspalum maritimum; Chromosome number; Meiotic behavior; Pollen fertility.
Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132000000300009
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Chromosome number and microsporogenesis of two accessions of Brachiaria dura Stapf (Poaceae) Biota Neotropica
Risso-Pascotto,Claudiceia; Pagliarini,Maria Suely; Valle,Cacilda Borges do.
The two accessions of B. dura analyzed (DU01 and DU02) are hexaploid (2n = 6x = 54), derived from x = 9. Meiotic abnormalities, such as precocious chromosome migration to the poles, laggards and micronuclei, were recorded in low frequency in both accessions. The few multivalent chromosome association at diakinesis and meiotic stability suggested that hexaploidy probably resulted from chromosome doubling. In DU02, chromosome transfer (cytomixis) among meiocytes, involving part or the entire genome was observed. The implication of these findings for the Brachiaria breeding is discussed.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Brachiaria dura; Meiosis; Chromosome number; Cytomixis.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032009000200024
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Chromosome number, microsporogenesis, microgametogenesis, and pollen viability in the Brazilian native grass Mesosetum chaseae (Poaceae). Repositório Alice
SILVA, L. A. C.; PAGLIARINI, M. S.; SANTOS, S. A.; SILVA, N.; SOUZA, V. F..
The genus Mesosetum is a primarily South American genus with 42 species. Mesosetum chaseae, regionally known as ?grama-do-cerrado?, is abundant in the Pantanal Matogrossense (Brazil); it is a valuable resource for livestock and for environmental conservation. We collected specimens from the Nhecolandia sub-region of the Brazilian Pantanal, located in Corumbá, Mato Grosso do Sul, Brazil. We examined chromosome number, ploidy level, meiotic behavior, microgametogenesis, and pollen viability of 10 accessions. All the accessions were diploid, derived from x = 8, presenting 2n = 2x = 16 chromosomes. Chromosomes paired as bivalents showing, predominantly, two terminal chiasmata. Interstitial chiasmata were rare. Meiosis was quite normal producing only a few...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Mesosetum chaseae; 'Grama-do-cerrado'; Meiosis; Chromosome number; Microgametogenesis; Pollen viability.
Ano: 2012 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/941635
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Chromosome studies in Orchidaceae from Argentina Genet. Mol. Biol.
Daviña,Julio Rubén; Grabiele,Mauro; Cerutti,Juan Carlos; Hojsgaard,Diego Hernán; Almada,Rubén Dario; Insaurralde,Irma Stella; Honfi,Ana Isabel.
The center of diversity of Argentinean orchids is in the northeast region of the country. Chromosome numbers and karyotype features of 43 species belonging to 28 genera are presented here. Five chromosome records are the first ones at the genus level; these taxa are Aspidogyne kuckzinskii (2n = 42), Eurystyles actinosophila (2n = 56), Skeptrostachys paraguayensis (2n = 46), Stigmatosema polyaden (2n = 40) and Zygostates alleniana (2n = 54). In addition, a chromosome number is presented for the first time for 15 species: Corymborkis flava (2n = 56), Cyclopogon callophyllus (2n = 28), C. oliganthus (2n = 64), Cyrtopodium hatschbachii (2n = 46), C. palmifrons (2n = 46), Galeandra beyrichii (2n = 54), Habenaria bractescens (2n = 44), Oncidium edwallii (2n =...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Chromosome number; Karyotype features; Polyploidy; Karyology; Orchids; South America.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572009000400024
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Citogenética de Piper hispidinervum e Piper aduncum Repositório Alice
NUNES, J.D.; TORRES, G.A.; DAVIDE, L.C.; SALGADO, C.C..
O objetivo deste trabalho foi detectar diferenças entre duas espécies de pimenta-longa por meio de análise de cariótipos. Foram analisados cinco acessos de Piper hispidinervum (Piperaceae) C. DC. e Piper aduncum L. (Piperaceae) pertencentes à coleção de germoplasma da Embrapa Acre, utilizando-se o método de esmagamento e coloração de Feulgen. As duas espécies apresentaram número cromossômico 2n = 24 e cromossomos pequenos e metacêntricos com comprimento médio de 1,38 ?m em P. hispidinervum e 1,32 ?m em P. aduncum. Pelos descritores citogenéticos obtidos não há diferença entre as duas espécies.
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Citologia; Diferença biológica; Cariótipo; Número de cromossomos; Cytology; Biological differences; Karyotypes; Piperaceae; Chromosome number.
Ano: 2007 URL: http://www.alice.cnptia.embrapa.br/handle/doc/122780
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Contribución al conocimiento del árbol de cirián (Crescentia alata Kunth.) variabilidad, selección, morfología, citogenética y fitoquímica. Colegio de Postgraduados
Peralta Valverde, Gabriel.
El cirián es un árbol medicinal con frutos esféricos que contiene iridoides y polifenoles los que confieren propiedades anti-inflamatorias, antioxidantes y antimicrobianas. La presente investigación se realizó en la región de Tierra Caliente, Michoacán, México en la Depresión del Balsas, la cual es uno de los refugios pleistocénicos más extensos de Norteamérica y centro de origen y domesticación del maíz; el árbol de cirián, es una especie emblemática de esta región y probablemente constituyó una fuente importante de alimento para los grupos humanos que colonizaron el centro-occidente de México hace más de treinta mil años. Los frutos de cirián partidos por la mitad sirven como recipientes que debieron ser de gran utilidad para el Hombre Temprano en México...
Palavras-chave: Depresión del Balsas; Compuestos fenólicos; Antioxidantes; Selección; Número cromosómico; Balsas Basin; Phenolics compounds; Antioxidants; Selection; Chromosome number; Genética; Doctorado.
Ano: 2012 URL: http://hdl.handle.net/10521/749
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Cytogenetic evaluation of chili ( Capsicum spp ., Solanaceae) genotypes cultivated in Valle del Cauca, Colombia Acta Agron. (Palmira)
Souza-Macedo,Viviane de; García-Dávila,Mario Augusto; Castro,Gisele Renata de; Garzón-Bautista,Yuri Marcela; Caetano,Creucí Maria.
Abstract The genus Capsicum comprises a large group of hot and sweet peppers, with different morphological varieties and degree of fruits pungency. Due to its active principles is widely used in cooking and in traditional medicine, being sold in large worldwide. In order to provide cytogenetic information which supporting plant breeding programs, this study aimed to analyze the meiotic behavior, chromosome number and pollen viability of the three species of greater economic importance of Capsicum (C. annuum, C. frutescens and C. chinense). Therefore, fruits and flower buds were collected from the Experimental Center of the Universidad Nacional de Colombia, campus Palmira- CEUNP to the corresponding mitotic, meiosis and pollen viability analysis. Plants...
Tipo: Journal article Palavras-chave: Chromosome number; Meiotic behavior; Meiotic index; Plant genetic resources conservation; Ploidy level; Pollen viability.
Ano: 2017 URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122017000400612
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Cytogenetics of Chilean angiosperms: Advances and prospects RChHN
JARA-SEGUEL,PEDRO; URRUTIA,JONATHAN.
Cytogenetic data on Chilean angiosperms have been reported since at least eight decades ago; however, much of this information is disperse in diverse sources and is not readily available as a comprehensive document that allows having a general vision on advances and gaps in this matter. The goal of this paper is to summarize the advances and prospets on cytogenetic studies of the Chilean angiosperms based on compiled publications from 1929 to 2010. We found 78 publications supplied by four groups of Chilean researchers and some foreign specialists. Cytogenetic data have been reported for 139 Chilean angiosperm species (2.8 % of the total), which belong to 58 genera and 34 families. During 2001-2010 there was an increase in the number of publications, being...
Tipo: Journal article Palavras-chave: Chromosome banding; Chromosome number; Genome size; Karyotype morphology.
Ano: 2012 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2012000100001
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Genetic, morphological, and chemical patterns of plant hybridization RChHN
López-Caamal,Alfredo; Tovar-Sánchez,Efraín.
Natural hybridization is a frequent phenomenon among vascular plants. Hybridization is considered an important evolutionary force since it may lead to (1) an increase of the intraspecific genetic diversity of the participating populations, (2) the creation of new species, (3) species extinction through genetic assimilation, and (4) the generation of highly invasive genotypes. Because of the importance of plant hybridization in evolution, it is of great importance to accurately identify hybrid individuals. In this review, we give a general historical background of the study of plant hybridization. Also, we review some of the tools employed for hybrid recognition and their pattern of expression in hybrid individuals (morphological, chemical, chromosome...
Tipo: Journal article Palavras-chave: Chromosome number; DNA fingerprinting; Hybrid performance; Hybrid phenotype; Invasive species; Secondary metabolites.
Ano: 2014 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2014000100015
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Heterochromatin and numeric chromosome evolution in Bignoniaceae, with emphasis on the Neotropical clade Tabebuia alliance Genet. Mol. Biol.
Cordeiro,Joel M.P.; Kaehler,Miriam; Souza,Luiz Gustavo; Felix,Leonardo P..
Abstract Bignoniaceae is a diverse family composed of 840 species with Pantropical distribution. The chromosome number 2n = 40 is predominant in most species of the family, with n = 20 formerly being considered the haploid base number. We discuss here the haploid base number of Bignoniaceae and examine heterochromatin distributions revealed by CMA/DAPI fluorochromes in the Tabebuia alliance, as well as in some species of the Bignonieae, Tecomeae, and Jacarandeae tribes. When comparing the chromosome records and the phylogenies of Bignoniaceae it can be deduced that the base number of Bignoniaceae is probably n = 18, followed by an ascendant dysploidy (n = 18 → n = 20) in the most derived and diverse clades. The predominant heterochromatin banding patterns...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Chromosome number; CMA/DAPI; Handroanthus; Polyploidy.
Ano: 2020 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572020000100303
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Induction and identification of polyploids in Cattleya intermedia Lindl. (orchidaceae) by in vitro techniques Ciência Rural
Silva,Paulo Artur Konzen Xavier de Mello e; Callegari-Jacques,Sídia; Bodanese-Zanettini,Maria Helena.
The effect of colchicine on the protocorm-like bodies of Cattleya intermedia L. (Orchidaceae) cultured in vitro was studied. Different concentrations of the drug (0.00, 0.05, 0.10 and 0.20%) as well as two times of culture (4 or 8 days) were tested to determine the best treatment for the induction of tetraploid plants. Of the 3 colchicine levels applied, 0.05 and 0.10% of drug treatments appeared to be effective on the production of mixoploids and tetraploids and could be further used in breeding programs. The suitability of stomatal area and stomata density as criteria for the distinction between diploids and tetraploids was also tested. The results suggested that tetraploid plants could be identified with a fair amount of certainty when the screening was...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cattleya; Colchicine; Chromosome number; Orchid improvement; Polyploidy; Stomata analysis.
Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782000000100017
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Intra- and interspecific karyotypic variations of the genus Senna Mill. (Fabaceae, Caesalpinioideae) Acta Botanica
Cordeiro,Joel Maciel Pereira; Felix,Leonardo P..
ABSTRACT Although the chromosome number 2n = 28 predominates in most species of the genus Senna, variations are often observed, resulting from either polyploidy (2n = 42, 56, 112) or disploidy (2n = 22, 24, 26) events. To better understand the karyotypic variations in Senna, we examined heterochromatin patterns of 10 species of that genus using chromomycin A3 (CMA) and 4’6-diamidino-2-phenylindole (DAPI) staining, and reviewed information on the chromosome counts of 72 species of that genus. The CMA/DAPI banding patterns were relatively variable among the 10 species, both in terms of the numbers of bands (from two to 26) and their locations on the chromosomes (terminal or proximal regions). Our review indicated that 2n = 28 is the most common ploidy among...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Chromosome number; CMA/DAPI; Disploidy; Leguminosae; Polyploidy.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062018000100128
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Karyotype of native Zea mays ssp. mays Proto-Confite morocho Acta Agron. (Palmira)
Lopéz Medina,Segundo Eloy; Mostacero Léon,José; Quijano Jara,Carlos Helí; Gil Rivero,Armando Efraín; Rabanal Che Leon,Maria Fernanda.
Abstract Corn is a crop of great importance in the world since it constitutes a basic component of the diet of the population; a production of 1026.61 million tons was estimated during the present year. Currently, there are many theories about the wild ancestors of corn, being Proto-Confite Morocho one of the primitive races in Peru, which is attributed as the ancestor of numerous native varieties. Therefore, knowledge of its genetic constitution is important since it gives us the possibility of finding phylogenetic affinities and indicators of systematic classification. The present study was carried out with the purpose of elaborating the karyotype of Zea mays ssp. mays ‘native corn’ Proto- Confite morocho and determine the number and...
Tipo: Journal article Palavras-chave: Chromosomes; Chromosome number; Metaphase plate.
Ano: 2018 URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122018000400525
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Malpighiaceae: correlations between habit, fruit type and basic chromosome number Acta Botanica
Lombello,Ricardo A.; Forni-Martins,Eliana R..
The family Malpighiaceae presents species with different habits, fruit types and cytological characters. Climbers are considered the most derived habit, followed, respectively, by the shrubby and arboreal ones. The present study examines the relationship between basic chromosome numbers and the derivation of climbing habit and fruit types in Malpighiaceae. A comparison of all the chromosome number reports for Malpighiaceae showed a predominance of chromosome numbers based on x=5 or 10 in the genera of sub-family Malpighioideae, mainly represented by climbers with winged fruits, whereas non-climbing species with non-winged fruits, which predominate in sub-family Byrsonimoideae, had counts based on x=6, which is considered the less derived basic number for...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Malpighiaceae; Malpighioideae; Byrsonimoideae; Chromosome number; Habit; Fruit types.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062003000200001
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Meiotic behavior during microsporogenesis of Alchornea triplinervia (Sprengel) Müller Argoviensis Ciência Rural
Godoy,Sara Mataroli de; Pereira,Andréia Rodrigues Alonso; Romagnolo,Mariza Barion; Risso-Pascotto,Claudicéia.
The Alchornea triplinervia specie belongs to the Euphorbiaceae family, one of the main families of the Brazilian flora. In order to contribute to a better understanding of the specie, a counting of chromosome number and the microsporogenesis analysis of A. triplinervia were done. The inflorescences were collected in the municipalities of Paranavaí and Diamante do Norte, State of Paraná, Brazil, and the slides were prepared by squashing technique and staining with 1% acetic carmine. The analysis were performed using an optical microscope and showed a chromosome number for the specie equal to 2n=8x=72. Irregularities in the chromosome segregation process were the main meiotic abnormalities, presenting typical polyploid behavior. Other irregularities were...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Euphorbiaceae; Chromosome number; 2n gametes; Meiosis; Polyploid.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782012000600012
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Meiotic study of Zea mays ssp. mays (2n = 40) x Tripsacum dactyloides (2 n = 72) hybrid and its progeny Electron. J. Biotechnol.
Molina,María del Carmen; García,María Dina; Chorzempa,Silvia Elena.
Maize (2n = 40) x Tripsacum dactyloides (2n = 72) F1 hybrid plants (2n = 56) were obtained by embryo rescue and induction of somatic embryogenesis/organogenesis. Hybrid plants showed Tripsacum-like phenotypes, tolerance to stresses such as NaCl salinity and low temperatures. The more frequent meiotic configurations were 28II (24%), 24II + 2IV (19%) and 26II + 1IV (12%), with an average per cell of 0.55I + 25.18II + 1.19IV. Significant differences between plants were not observed. Pollen fertility ranged from 0% to 50%. After pollination with maize or Tripsacum, 20% of F1 plants have developed viable seeds, which originated the progeny. Thirty five percent of the progeny showed 2n = 56 chromosomes and F1 like-phenotypes, which suggests they have apomictic...
Tipo: Journal article Palavras-chave: Chromosome number; Corn; Eastern gamagrass; Remote hybridisation.
Ano: 2006 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000300020
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Microsporogenesis in Brachiaria bovonei (Chiov.) Robyns and B. subulifolia (Mez) Clayton (Poaceae) Scientia Agricola
Risso-Pascotto,Claudicéia; Pagliarini,Maria Suely; Valle,Cacilda Borges do.
Some African species of Brachiaria have been introduced into the Americas and became the most important forage for pastures in the tropics. New cultivars can be obtained either from direct selections from the natural existing variability in the germplasm collections or from interspecific hybridizations. Polyploidy is predominant in the genus Brachiaria and correlated with apomixis which complicates hybridization. The objective of cytological studies underway on the Brachiaria germplasm collection at Embrapa Beef Cattle is to determine the chromosome number and meiotic behavior of accessions. For the breeding of Brachiaria species, compatible sexual and apomictic accessions need to be identified. Microsporogenesis was evaluated in two accessions of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Brachiaria; Meiosis; Chromosome number; Polyploidy; Breeding program.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000500015
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Microsporogenesis in tetraploid accessions of Brachiaria nigropedata (Ficalho & Hiern) Stapf (Gramineae) Biocell
Sayuri Utsunomiya,Karina; Suely Paglirini,Maria; Borges do Valle,Cacilda.
The genus Brachiaria (Trin.) Griseb. has achieved considerable importance to cattle production systems, as a result of the good production and adaptation of a few cultivars to poor and acid soils of the Brazilian savannas. Many of its species and accessions are polyploid and apomictic, which limits direct hybridization. To assist the breeding program, cytogenetic characterization has been undertaken on the accessions of Brachiaria collection at the Embrapa Beef Cattle Research Center. In this study, chromosome number and meiotic behavior are reported for the Brachiaria nigropedata (Ficalho & Hiern) Stapf collection. The 20 available accessions are tetraploid (2n = 4x = 36). Chromosomes paired preferentially as bivalents, but quadrivalents were...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Brachiaria nigropedata; Chromosome number; Meiosis; Polyploidy; Apomixis; Grasses.
Ano: 2005 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-95452005000300007
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