Consulta: subjectFacets:"Polyploidy"
Registros recuperados: 37
Data/hora: 29/05/2024 00:33:51

Natural triploidy in Leporinus cf. elongatus bearing sex chromosomes
Provedor de dados: Genetics and Molecular Biology
Autores: Molina,Wagner Franco; Margarido,Vladimir Pavan; Galetti Jr,Pedro Manoel.
Although several cases of natural triploidy in fish have already been described, spontaneous polyploidy in species with differentiated sex chromosomes are rare. We report the occurrence of a triploid fish (3n = 81) Leporinus cf. elongatus, a species characterized by a highly differentiated ZZ/ZW sex chromosome system, from the São Francisco river. The occurrence of a ZZZ triploid adult indicates the viability of this chromosome constitution in this fish.
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Polyploidy; Triploid fish; ZW chromosomes; Sex chromosomes; Anostomidae.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572007000400010

Whole-genome duplication and hemoglobin differentiation traits between allopatric populations of Brazilian Odontophrynus americanus species complex (Amphibia, Anura)
Provedor de dados: Genetics and Molecular Biology
Autores: Cianciarullo,Aurora M.; Bonini-Domingos,Claudia R.; Vizotto,Luiz D.; Kobashi,Leonardo S.; Beçak,Maria-Luiza; Beçak,Willy.
Abstract Two allopatric populations of Brazilian diploid and tetraploid Odontophrynus americanus species complex, both from São Paulo state, had their blood hemoglobin biochemically analyzed. In addition, these specimens were cytogenetically characterized. Biochemical characterization of hemoglobin expression showed a distinct banding pattern between the allopatric specimens. Besides this, two distinct phenotypes, not linked to ploidy, sex, or age, were observed in adult animals of both populations. Phenotype A exhibits dark-colored body with small papillae, ogival-shaped jaw with reduced interpupillary distance and shorter hind limbs. Phenotype B shows yellowish-colored body with larger papillae, arch-shaped jaw with broader interpupillary distance and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anura; Cryptic species; Hemoglobin differentiation; Polyploidy; Whole-genome duplication.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572019000300436

Chromosome studies in Orchidaceae from Argentina
Provedor de dados: Genetics and Molecular Biology
Autores: 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

Ecological setup, ploidy diversity, and reproductive biology of Paspalum modestum, a promising wetland forage grass from South America
Provedor de dados: Genetics and Molecular Biology
Autores: Karunarathne,Piyal; Feduzka,Cristian; Diego,Hojsgaard.
Abstract With ever-rising demand for food, forage breeding for intensification of cattle production is also taking a leap. In South America, cattle production systems are displaced to marginal areas poorly exploited with cultivated pastures yet with high potential for growing stocking rates. This places the need for using native genetic resources to breed locally adapted plant genotypes that benefits from better forage quality, yield, and lesser threat to the local biodiversity. Paspalum modestum Mez is a grass species that produces quality forage and grows in marginal areas like estuaries and floodplains, suitable for introduction in breeding programs. In this study we characterize the species' reproductive biology and ecological preferences needed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Apomixis; Ecological niche; Plant breeding; Polyploidy; Sexuality.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572020000300304

A karyotypic study of three southern Brazilian Asteraceae species using fluorescence in situ hybridization with a 45S rDNA probe and C-CMA3 banding
Provedor de dados: Genetics and Molecular Biology
Autores: Fregonezi,Jéferson N.; Torezan,José M.D.; Vanzela,André L.L.
The Asteraceae, one of the largest families of flowering plants, contains about 1,100 genera and 20,000 species, and is well known for its extensive karyotypic variation. In this study, conventional Feulgen staining, C-CMA3 banding, and fluorescence in situ hybridization with a 45S rDNA probe were used to determine the chromosome number and the number and physical position of GC-rich heterochromatin and 45S rDNA sites in three Asteraceae weed species (Crepis japonica, Galinsoga parviflora and Chaptalia nutans). The three species exhibited karyotype differences in the chromosome number and shape, as a commom feature of Asteraceae. However, the 45S rDNA sites always occurred on the short chromosomal arms, associated with GC-heterochromatin. Althought of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: CMA3; FISH; Heterochromatin; Polyploidy; 45S rDNA.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572004000200016

Chromosome characterization and variability in some Iridaceae from Northeastern Brazil
Provedor de dados: Genetics and Molecular Biology
Autores: Alves,Lânia Isis F.; Lima,Saulo Antônio A.; Felix,Leonardo P.
The chromosomes of 15 species of Iridaceae of the genera Alophia, Cipura, Eleutherine, Neomarica and Trimezia (subfamily Iridoideae) were examined after conventional Giemsa staining. The karyotypes of Alophia drummondii (2n = 14+1B, 28, 42 and 56), Cipura paludosa (2n = 14), C. xanthomelas (2n = 28) and Eleutherine bulbosa (2n = 12) were asymmetric; Neomarica candida, N. caerulea, N. humilis, N. glauca, N. gracilis, N. northiana and Neomarica sp. (2n = 18); N. cf. paradoxa (2n = 28), Trimezia fosteriana (2n = 52), T. martinicensis (2n = 54) and T. connata (2n = 82) were all generally symmetric. New diploid numbers of 2n = 56 for Alophia drummondii, 2n = 18 for N. candida, N. humilis, N. glauca, and N. gracilis, 2n = 28 for N. cf. paradoxa, and 2n = 82 for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Iridaceae; Disploidy; Karyotypic evolution; Polyploidy; Asymmetrical karyotype.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572011000200016

Chromosomal and morphological studies of diploid and polyploid cytotypes of Stevia rebaudiana (Bertoni) Bertoni (Eupatorieae, Asteraceae)
Provedor de dados: Genetics and Molecular Biology
Autores: Oliveira,Vanessa M. de; Forni-Martins,Eliana R.; Magalhães,Pedro M.; Alves,Marcos N.
In this study, we examined the chromosome number and some morphological features of strains of Stevia rebaudiana. The chromosomes were analyzed during mitosis and diakinesis, and the tetrad normality and pollen viability were also assessed. In addition, stomata and pollen were measured and some plant features were studied morphometrically. All of the strains had 2n = 22, except for two, which had 2n = 33 and 2n = 44. Pairing at diakinesis was n = 11II for all of the diploid strains, whereas the triploid and tetraploid strains had n = 11III and n = 11IV, respectively. Triploid and tetraploid plants had a lower tetrad normality rate than the diploids. All of the strains had inviable pollen. Thus, the higher the ploidy number, the greater the size of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Asteraceae; Pollen; Polyploidy; Stevia rebaudiana; Stevioside; Stomata.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572004000200015

A new approach for obtaining rapid uniformity in rice (Oryza sativa L.) via a 3x x 2x cross
Provedor de dados: Genetics and Molecular Biology
Autores: Xing,Shaochen; Cai,Yuhong; Zhou,Kaida.
A triploid (2n = 3x = 36) rice plant was obtained by screening a twin seedling population in which each seed germinated to two or three sprouts that were then crossed with diploid plants. One diploid plant was chosen among the various F1 progenies and developed into an F2 population via self-pollination. Compared with the control variety Shanyou 63, this F2 population had a stable agronomical performance in field trials, as confirmed by the F-test. The stability of the F2 population was further substantiated by molecular analysis with simple sequence repeat markers. Specifically, of 160 markers assayed, 37 (covering all 12 chromosomes) were polymorphic between the parental lines. Testing the F1 hybrid individually with these markers showed that each PCR...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: F-test; Polyploidy; Rice; SSR marker; Stability.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572010000200020

True polyploid meiosis in the human male
Provedor de dados: Genetics and Molecular Biology
Autores: Pearson,Peter L.; Madan,Kamlesh.
Abstract Polyploidy does not usually occur in germinal cells of mammals and other higher vertebrates. We describe a unique example of mosaic autotetraploidy in the meiosis of a human male. Although the original observations were made in the late 1960s, we did not publish them at that time, because we expected to detect further examples that could be described together. However, this did not occur and we have now decided to make the observations available to demonstrate that polyploidy in mammalian male meiosis can arise at a higher frequency than expected by random polyploidization of individual meiotic cells, by either DNA duplication or cell fusion prior to synapsis. This is the first description of a population of primary spermatocytes exhibiting...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Polyploidy; Meiosis; Human; Male.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572018000300410

Heterochromatin and numeric chromosome evolution in Bignoniaceae, with emphasis on the Neotropical clade Tabebuia alliance
Provedor de dados: Genetics and Molecular Biology
Autores: 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

Cytological and genome size data analyzed in a phylogenetic frame: Evolutionary implications concerning Sisyrinchium taxa (Iridaceae: Iridoideae)
Provedor de dados: Genetics and Molecular Biology
Autores: Burchardt,Paula; Souza-Chies,Tatiana T.; Chauveau,Olivier; Callegari-Jacques,Sidia M.; Brisolara-Corrêa,Lauís; Inácio,Camila Dellanhese; Eggers,Lilian; Siljak-Yakovlev,Sonja; de Campos,José Marcello Salabert; Kaltchuk-Santos,Eliane.
Abstract Sisyrinchium is the largest genus of Iridaceae in the Americas and has the greatest amount of cytological data available. This study aimed at investigating how genomes evolved in this genus. Chromosome number, genome size and altitude from species of sect. Viperella were analyzed in a phylogenetic context. Meiotic and pollen analyses were performed to assess reproductive success of natural populations, especially from those polyploid taxa. Character optimizations revealed that the common ancestor of sect. Viperella was probably diploid (2n = 2x =18) with two subsequent polyplodization events. Total DNA content (2C) varied considerably across the phylogeny with larger genomes detected mainly in polyploid species. Altitude also varied across the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ancestral chromosome number; DNA content; Meiotic behavior; Pollen viability; Polyploidy.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572018000200288

Influence of ploidy and metal-metal interactions on the accumulation of Ag, Cd, and Cu in oysters Crassostrea gigas thunberg
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Amiard, Jean-claude; Perrein Ettajani, H; Gerard, Andre; Baud, Jean-pierre; Amiard Triquet, C.
The present study was designed to compare the response to contaminants in diploid with triploid specimens of the oyster Crassostrea gigas. The reproduction investment in bivalve molluscs has priority on somatic growth. Thus, genetic sterilization by triploidy induction enables the energy flux to be directed toward somatic growth and glucide storage. Bioaccumulation was examined for Ag (10 mug/L), Cd (10 mug/L), and Cu (30 mug/L) to determine if the response to metals follows similar patterns in diploid (2n) and triploid (3n) groups. The effect of ploidy was also evaluated as a function of dry weight of soft tissue and condition index. Moreover, the reciprocal influence of these metals on their incorporation was studied. The results showed that the major...
Tipo: Text
Palavras-chave: Oyster culture; Metal bioaccaumulation; Polyploidy.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-791.pdf

Obtention de souches conchylicoles performantes par polyploïdisation (5ème partie)
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Gerard, Andre; Naciri, Yamama; Peignon, Jean-marie; Ledu, Christophe; Phelipot, Pascal; Baud, Jean-pierre; Nourry, Max; Haure, Joel; Heurtebise, Serge; Garnier, Jacqueline; Martin, Anne-genevieve; Claude, Serge; Langlade, Aime; Joly, Jean-pierre; Goulletquer, Philippe; Ruelle, Francois; Coatanea, Denis; Oheix, Jocelyne; Vercelli, Catherine; Chabirand, Jean-michel; Maurer, Daniele; Borel, Michel; Cardinal, Mireille; Cornet, Josiane; Le Pennec, Marcel; Le Mercier, A.
This fifth part of the polyploidisation program reports the experiments that were conducted in 1993 and that were devoted to : - monitoring growth performance of Ostrea edulis diploids and triploids in La Trinité sur Mer and Palavas - monitoring growth performance of Crassostrea gigas diploids and triploids in Port en Bessin, Marennes Oleron (2 locations), Arcachon and Palavas - comparative study of gametogenesis for C. gigas diploids and triploids - comparative study of C. gigas diploids and triploids using sensorial analysis At the end of fifth year, it was clear that triploids are advantageous although such a statement must be moderated according to locations. The gametogenesis stydy showed that triploidy is associated with partial to complete...
Tipo: Text
Palavras-chave: Crassostrea gigas; Ostrea edulis; Cytogenetics; Polyploidy; Crassostra gigas; Ostrea edulis; Cytogénétique; Polyploïdie.
Ano: 1994
URL: http://archimer.ifremer.fr/doc/1994/rapport-3860.PDF

A complementary method for production of tetraploid Crassostrea gigas using crosses between diploids and tetraploids with cytochalasin B treatments
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Mccombie, Helen; Ledu, Christophe; Phelipot, Pascal; Lapegue, Sylvie; Boudry, Pierre; Gerard, Andre.
We present a new method to produce tetraploid Crassostrea gigas by cytochalasin B inhibition of polar body 2 expulsion in diploid females crossed with tetraploid males. This offers a means of direct introgression of genetic characters from selected diploid to tetraploid lines, avoiding a triploid step. Offspring larval ploidy shifted over time and depended on size, with tetraploids more frequent among the smaller larvae and triploids among the large. Viable tetraploids were found at 4 and 6 months, indicating the technique was successful. The possibility that gynogenesis occurred was tested by microsatellite analysis to confirm the presence of paternally inherited alleles. These were present in all animals of the 2n x 4n + CB (female first) cross. However,...
Tipo: Text
Palavras-chave: Oyster breeding; Gynogenesis; Polar body; Cytochalasin B; Polyploidy; Crassostrea gigas.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-632.pdf

Reproduction uniparentale et polyploidie induites chez la truite arc-en-ciel (Oncorhynchus mykiss) et chez les bivalves Crassostrea gigas, Ruditapes philippinarum et Chlamys varia
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Diter, Alain.
Methods of gynogenesis, androgenesis and polyploidy induction were developed with the aim of genetic improvement in the rainbow trout, the Pacific oyster, the Manila clam and the black scallop. In the trout: · haploid androgenesis was induced by means of a pressure shock applied on diploid eggs, probably at the time of karyogamy. Diploid androgenetic individuals were directly produced from eggs fertilized with sperm from tetraploid male. · a heat shock treatment effective for suppressing the first egg mitosis was developed. This treatment allows the production of homozygous gynogenetic lines (checked using enzyme electrophoresis technique) from eggs inseminated with ultraviolet irradiated sperm. The treatment also induced tetraploidy in eggs normally...
Tipo: Text
Palavras-chave: Méthode induction gynogenèse; Androgenèse; Polyploïdie; Oncorhynchus mykiss; Crassostrea gigas; Ruditapes philippinarum; Chlamys varis; Génétique; Methods of gynogenesis; Androgenesis; Polyploidy; Oncorhynchus mykiss; Crassostrea gigas; Ruditapes philippinarum; Chlamys varis; Genetic.
Ano: 1990
URL: http://archimer.ifremer.fr/doc/00210/32097/30553.pdf

Effects of cytochalasin B on fertilization and ploidy in the Pacific oyster Crassostrea gigas
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Ledu, Christophe; Mccombie, Helen.
The effects of cytochalasin B on fertilization and ploidy in Crassostrea gigas were examined in a controlled experiment. This enabled us to better understand why variable ploidy results have been found with the retention of polar bodies in previous studies on bivalve mollusks, and what the interaction with fertilization may be. By looking at the early development of Crassostrea gigas embryos with sequential samples stained using Hoechst 33258, a fluorescent DNA-specific dye, we compared normal evolution of fertilized eggs with that obtained with cytochalasin B treatment. In treated eggs, embryos with both three and four pronuclei were found after the second meiotic division. When embryos had three pronuclei, these were identified as the female pronucleus...
Tipo: Text
Palavras-chave: Crassostrea gigas; Fertilization; Cytochalasin B; Polar body; Polyploidy.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/2003/publication-2845.pdf

Obtention de souches conchylicoles performantes par polyploïdisation (4ème partie)
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Gerard, Andre; Naciri, Yamama; Peignon, Jean-marie; Ledu, Christophe; Phelipot, Pascal; Bodoy, Alain; Heurtebise, Serge; Garnier, Jacqueline; Baud, Jean-pierre; Nourry, Max; Haure, Joel; Martin, Anne-genevieve; Claude, Serge; Barret, Jean; Devauchelle, Nicole; Joly, Jean-pierre; Goulletquer, Philippe; Coatanea, Denis; Oheix, Jocelyne; Zanette, Yvan; Blachier, Philippe.
This fourth part of the polyploidisation program reports the experiments that were conducted in 1992 and that were devoted to : - the acquiring of a new method using an epifluroescent microscope - the development o a new technique for inducing polyploidy - the triploidy induction for the Europena clam Ruditapes decussatus - the settlement of performance controls conducted on diploid and triploid populations of Ostrea edulis - results of performance controls conducted on diploid and triploid populations of Crassostrea gigas and Ruditapes philippinarum
Tipo: Text
Palavras-chave: Ruditapes decussatus; Ruditapes philippinarum; Ostrea edulis; Crassostra gigas; Cytongenetics; Polyploidy; Ruditapes decussatus; Ruditapes philippinarum; Ostrea edulis; Crassostrea gigas; Cytogénétique; Polyploïdie.
Ano: 1993
URL: http://archimer.ifremer.fr/doc/1993/rapport-3859.PDF

Polyploid fish and shellfish: Production, biology and applications to aquaculture for performance improvement and genetic containment
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Piferrer, Francesc; Beaumont, Andy; Falguiere, Jean-claude; Flajshans, Martin; Haffray, Pierrick; Colombo, Lorenzo.
Polyploids can be defined as organisms with one or more additional chromosome sets with respect to the number most frequently found in nature for a given species. Triploids, organisms with three sets of homologous chromosomes, are found spontaneously in both wild and cultured populations and can be easily induced in many commercially relevant species of fish and shellfish. The major consequence of triploidy is gonadal sterility, which is of advantage in the aquaculture of molluscs since it can result in superior growth. In fish, the induction of triploidy is mainly used to avoid problems associated with sexual maturation such as lower growth rates, increased incidence of diseases and deterioration of the organoleptic properties. Triploidy can also be used...
Tipo: Text
Palavras-chave: GMO; Transgenic containment; Genetic containment; Reproductive containment; Hybridisation; Sterility; Fish; Shellfish; Fish farming; Aquaculture; Tetraploidy; Triploidy; Polyploidy.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-6648.pdf

Genetic improvement and selection in shellfish : a review based on oyster research and production
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Boudry, Pierre; Barre, Marc; Gerard, Andre.
Despite the economic importance of shellfish, genetic improvement has not yet had a great impact on these species. Shellfish farming is traditionally based on wild species whose natural populations are often overexploited and do not fulfil market demand. Up to now, the most effective answer 10 disease problems or for the improvement of productivity has been the introduction of new species. However, the introduction of new species is constrained by their ecological impact and is also limited by the availability 01 suitable species. Genetic improvement of local species should therefore be of great importance as a viable alternative for the long term sustainability 01 the shellfish Industry. The different approaches 10 genetic improvement include...
Tipo: Text
Palavras-chave: Selective breeding; Hybridization; Polyploidy; Introduction; Oyter; Sélection; Hybridation; Polyploïdie; Introduction; Huîtres.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/1998/publication-2740.pdf

Het Dryopteris affinis-complex in Nederland
Provedor de dados: Naturalis Digital Academic Repository
Autores: Hovenkamp, P.; Hendrikx, B.; Roskam, H.; Winter, W. de.
With the help of flow-cytometric analysis of nuclear DNA content and morphology, we establish the presence in the Netherlands of two taxa of the Dryopteris affinis complex: diploid D. affinis subsp. affinis, triploid D. affinis subsp. borreri, and the hybrids D × complexa (tetraploid) and D. × critica (pentaploid).  Onderzoek aan kern-DNA gewicht en morfologie van recente vondsten van het Dryopteris affinis-complex wijst uit dat in Nederland twee taxa en twee hybrides met redelijke zekerheid zijn gevonden: dediploïde D. affinis subsp. affinis, de triploïde D. affinis subsp. borreri, en de hybriden D × complexa (tetraploïd) en D. × critica (pentaploïd). We analyseren een aantal onderscheidende kenmerken en maken de keuze om deze taxa te behandelen als...
Tipo: Article / Letter to the editor
Palavras-chave: Dryopteris affinis; Soortscomplex; Species complex; Uitbreiding; Range expansion; Genoomgrootte; Genome size; Cytotypes; Polyploidie; Polyploidy; Morfometrie; Morphometrics.
Ano: 2018
URL: http://www.repository.naturalis.nl/record/669050

Arachis hoehnei, the probable B genome donor of Arachis hypogaea based on crossability, cytogenetical and molecular studies
Provedor de dados: Open Acess Agriculture Research Repository
Autores: 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

Exploitation of wild relatives of pigeonpea and chickpea for resistance to Helicoverpa armigera
Provedor de dados: Open Acess Agriculture Research Repository
Autores: Mallikarjuna, N.,( Nalini Mallikarjuna ).
Palavras-chave: Pigeonpeas; Chickpeas; Hybridization; Genes; Gene pools; Interspecific hybridization; Hybrids; Genomes; Gene transfer; Polyploidy.
Ano: 2007
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3283

International Workshop on Groundnuts
Provedor de dados: Open Acess Agriculture Research Repository
Autores: R.W.( Editor ).
Palavras-chave: Groundnuts; Root nodulation; Genotypes; Biological interaction; Mycotoxins; Chromosomes; Fungi; Breeds (animals); Polyploidy.
Ano: 1980
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3978

Use of 2n pollen in generating interspecific derivatives of groundnut
Provedor de dados: Open Acess Agriculture Research Repository
Autores: Mallikarjuna, N.
Palavras-chave: Genomes; Polyploidy; Nucleus; Hybrids; Chromosome number; Chromosomes; Mosses; Meiosis; Cytogenetics; DNA.
Ano: 2006
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3176

Stomatal analysis of citrus somatic hybrids obtained by protoplast fusion
Provedor de dados: Pesquisa Agropecuária Brasileira
Autores: Costa,Maria Angélica Pereira de Carvalho; Almeida,Weliton Antonio Bastos de; Mourão Filho,Francisco de Assis Alves; Mendes,Beatriz Madalena Januzzi; Rodriguez,Adriana Pinheiro Martinelli.
The objective of this work was to evaluate leaf epidermis morphological characteristics of three citrus somatic hybrids, compared to their parents. Parental and somatic hybrid young leaves were collected and processed for scanning electron microscope observations. Citrus polyploid hybrids have fewer stomata per area and these are larger compared to their diploid parental parents. No differences in internal arrangement of the stomatal cells were detected between parental plants and somatic hybrids. Additional studies may determine if these differences will influence physiological behavior of the plants in the field.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Stoma; Somatic hybridization; Scanning electron microscopy; Polyploidy.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2004000300015

Biotechnology applied to Annona species: a review
Provedor de dados: Revista Brasileira de Fruticultura
Autores: Encina,Carlos Lopez; Martin,Elisabeth Carmona; Lopez,Antonio Arana; Padilla,Isabel Maria Gonzalez.
Annonaceae is an ancient family of plants including approximately 50 genera growing worldwide in a quite restricted area with specific agroclimatic requirements. Only few species of this family has been cultivated and exploited commercially and most of them belonging to the genus Annona such as A. muricata, A. squamosa, the hybrid A. cherimola x A. squamosa and specially Annona cherimola: the cherimoya, commercially cultivated in Spain, Chile, California, Florida, México, Australia, Ecuador, Peru, Brazil, New Zealand and several countries in South and Central America. The cherimoya shows a high degree of heterozygosis, and to obtain homogeneous and productive orchards it is necessary to avoid the propagation by seeds of this species. Additionally, the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Annona; In vitro; Micropropagation; Protoplasts; Organogenesis; Polyploidy.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452014000500002

Microsporogenesis in Brachiaria bovonei (Chiov.) Robyns and B. subulifolia (Mez) Clayton (Poaceae)
Provedor de dados: Scientia Agricola
Autores: 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

Intra- and interspecific karyotypic variations of the genus Senna Mill. (Fabaceae, Caesalpinioideae)
Provedor de dados: Acta Botanica Brasilica
Autores: 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

Self-sterility in the hexaploid Handroanthus serratifolius (Bignoniaceae), the national flower of Brazil
Provedor de dados: Acta Botanica Brasilica
Autores: Alves,Mariana Ferreira; Duarte,Mariana Oliveira; Oliveira,Paulo Eugênio; Sampaio,Diana Salles.
Polyploidization is common among angiosperms and might induce typically allogamous plants to become autogamous (self-compatible, relying on sexual self-fertilization) or apomictic (achieving asexual reproduction through seeds). This work aimed to determine whether neopolyploidy leads to the breakdown of the self-incompatibility system in the hexaploid non-apomictic species Handroanthus serratifolius (Vahl) S. Grose, through analyses of its floral biology, pollination biology and breeding system. Although anthesis lasted for three days, increasing the overall floral display, receptivity decreased as of the second day. Centridini and Euglossini bees were the main pollinators, and low nectar availability (1.95 ± 1.91 µl/flower) might have obliged them to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Apomixis; Late-acting self-incompatibility; Monoembryony; Polyploidy; Tabebuia serratifolia.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062013000400010

New chromosome numbers in Pilocarpus Vahl (Rutaceae)
Provedor de dados: Acta Botanica Brasilica
Autores: Skorupa,Ladislau A.
Chromosome counts for eight species of Pilocarpus Vahl (Rutaceae) a native of Brazil are reported for the first time. Chromosome numbers were determined from mitotic root tip cells of seedlings derived from field collections and grown in the greenhouse. Feulgen staining was used. Initial pre-treatment of root tips was done by using a saturated aqueous solution of alpha-bromonapthalene for two hours at room temperature (20-25ºC). Chromosome numbers of 2n=44 and 2n=88 were determined for the examined taxa. The present results suggest the occurrence of tetraploidy in P. spicatus St.-Hil. and P. carajaensis Skorupa, and a possible basic number x=22 to the genus Pilocarpus.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pilocarpus; Rutaceae; Cusparieae; Cytology; Polyploidy.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062000000100002

Post pollination events in a self-sterile hexaploid monoembryonic lineage of Handroanthus serratifolius (Vahl) S. Grose (Bignoniaceae)
Provedor de dados: Acta Botanica Brasilica
Autores: Alves,Mariana Ferreira; Bittencourt Júnior,Nelson Sabino; Oliveira,Paulo Eugênio; Sampaio,Diana Salles.
ABSTRACT In diploid late-acting self-incompatible (LSI) species of Bignoniaceae, self-pollinated pistils show a marked delay in ovule penetration by pollen tubes, followed by delayed, but otherwise normal, initial stages of endosperm development and subsequent pistil abscission. Most polyploid species of Bignoniaceae are apomictic and set selfed fruits with viable polyembryonic seeds carrying adventitious embryos. Handroanthus serratifolius is a polyploid species with sporophytic apomictic individuals that produce polyembryonic seeds after either self- or cross-pollination, and other LSI individuals that produce exclusively monoembryionic seeds. Our aim was to determine whether self-sterility events in the latter are similar to those observed in other...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Adventitious embryo precursor cells; Handroanthus serratifolius; Polyploidy; Self-sterility; Tabebuia serratifolia.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062019000300530

Karyotype characterization and evolution of chromosome number in Cactaceae with special emphasis on subfamily Cactoideae
Provedor de dados: Acta Botanica Brasilica
Autores: Castro,Juliana P.; Moraes,Ana Paula; Chase,Mark W.; Santos,Angeline M. S.; Batista,Fabiane R. C.; Felix,Leonardo P.
ABSTRACT Cactaceae species are karyotypically well-known with x = 11 and chromosome number variation due mainly to polyploidization. However, both assumptions are based on descriptive observations without taking an evolutionary framework of Cactaceae into account. Aiming to confirm these hypotheses in an evolutionary context, we obtained chromosome numbers for 20 species of Cactoideae, performed an extensive review of chromosome number for the family, and analyzed these data using a phylogenetic approach. The karyotypes presented here were characterized by CMA/DAPI banding, and for six species 5S and 45S rDNA sites were located. Our data, along with a survey of the literature, reinforce the long-standing hypothesis of a x = 11 as the base chromosome number...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Base chromosome number; CMA/DAPI; Dysploidy; Heterochromatin; Polyploidy; RDNA.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062020000100135

First cytomolecular characterization of three Neotropical woody bamboos (Bambusoideae, Poaceae) suggests ancient diploidized karyotypes
Provedor de dados: Acta Botanica Brasilica
Autores: Zappelini,Julia; Souza,Luiz Gustavo; Guerra,Miguel Pedro; Pescador,Rosete.
ABSTRACT Although karyotype features are useful data for evolutionary studies, cytogenetic data in Bambusoideae are mainly based only on chromosome counts. The first comparative cytogenetic analysis of three Neotropical woody bamboo species - Guadua chacoensis, G. angustifolia and Chusquea tenella - was undertaken based on new and reviewed chromosome counts, CMA/DAPI double staining, fluorescent in situ hybridization (FISH) with 35S and 5S rDNA probes, and genome size estimation. The two species of Guadua were found to have 2n = 46 chromosomes, while the first record for C. tenella was 2n = 44. Only one pair of CMA+/DAPI- was detected on the terminal region of metacentric chromosomes in all three species. Likewise, one pair of 5S and 35S rDNA sites was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chusquea; Cytogenetics; Diploidization; Evolution; Guadua; Polyploidy.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062020000400673

Sobrevivência e diferenciação de protocormos de Oncidium flexuosum submetidos a tratamento com ácido peracético e colchicina - DOI: 10.4025/actasciagron.v31i3.697
Provedor de dados: Acta Scientiarum: Agronomy
Autores: Unemoto, Lilian Keiko; UEL; Faria, Ricardo Tadeu de; UEL; Destro, Deonisio; UEL; Barbosa, Cristiane Muniz; UEL; Lone, Alessandro Borini; UEL.
O objetivo deste trabalho foi verificar o efeito do ácido peracético e da colchicina na diferenciação de protocormos de Oncidium flexuosum. O ácido peracético foi testado previamente nas concentrações de 0, 3, 6 e 9 mL L-1, durante dez dias, para verificar a eficácia na esterilização do meio de cultura e os possíveis efeitos fitotóxicos nos protocormos. Após determinação da concentração, foram adicionados 6 mL L-1 de ácido peracético em meio MS com 0,05% de colchicina e DMSO 1%. Os protocormos foram mantidos em agitação pelos períodos: 0, 24, 48, 72, 96 e 120h. O experimento foi inteiramente casualizado com seis tratamentos, dez repetições e cinco protocormos por repetição. Após 30 dias, foi avaliada a sobrevivência dos protocormos e, após 180 dias, foram...
Palavras-chave: 5.01.00.00-9    Agronomia Orchidaceae; Poliploidia; Fitotoxicidade; Esterilização Fitotecnia Orchidaceae; Polyploidy; Phytotoxicity; Sterilization.
Ano: 2009
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/697

Karyological studies in Brazilian species of Lippia L. (Verbenaceae)
Provedor de dados: Anais da Academia Brasileira de Ciências
Autores: Sousa,Saulo M.; Torres,Giovana A.; Viccini,Lyderson F.
The genus Lippia (Verbenaceae) comprise around 160 species spread out mainly in South and Central Americas with few African species, some of them with potential medicinal use. Brazil is one the most important centers of diversity with approximately 75% of the species described so far. Innumerous species are endemic and poorly studied especially at a cytological level. Here, chromosomal length, karyomorphology and chromosome asymmetry of twelve Brazilian species of Lippia were evaluated [L. alba (Miller) N.E.Brown, L. diamantinensis Glaz., L. florida Cham., L. hermanioides Cham., L. lacunosa Mart. &amp;amp; Schauer, L. lupulina Cham., L. pohliana Schauer, L. pseudothea (St. Hil) Schauer, L. rosella Moldenke, L. rotundifolia Cham., L. rubella Moldenke and L....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chromosomes; Cytology; Dysploidy; Karyology; Lippia; Polyploidy.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000400017

Microsporogenesis in tetraploid accessions of Brachiaria nigropedata (Ficalho &amp;amp; Hiern) Stapf (Gramineae)
Provedor de dados: Biocell
Autores: 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 &amp;amp; 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

Induction and identification of polyploids in Cattleya intermedia Lindl. (orchidaceae) by in vitro techniques
Provedor de dados: Ciência Rural
Autores: 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