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Chromosomal variability in Brazilian species of Anthurium Schott (Araceae): Heterochromatin, polyploidy, and B chromosomes Genet. Mol. Biol.
Nascimento,Sarah do; Coelho,Marcus Alberto Nadruz; Cordeiro,Joel M. P.; Felix,Leonardo P..
Abstract The genus Anthurium has a Neotropical distribution, with karyotype predominance of x = 15, although some species show disploidy or polyploid variations. The karyotypes of seven species and different populations of Anthurium were analyzed using fluorochrome CMA and DAPI staining. The karyotypes were composed of meta- and submetacentric chromosomes, with numbers varying from 2n = 30 to 2n = 60. Supernumerary euchromatic chromosomes were observed in A. affine, and supernumerary heterochromatic chromosomes were observed in A. gladiifolium and A. petrophilum. Polyploidy was recurrent in the Anthurium species analyzed, with records of 2n = 30 and 60 in different A. pentaphyllum populations. Fluorochrome staining revealed different CMA+ banding...
Tipo: Info:eu-repo/semantics/article Palavras-chave: B chromosomes; CMA/DAPI; Cytotaxonomy; Neotropical Araceae.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572019000400635
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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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Intra- and interspecific chromosome polymorphisms in cultivated Cichorium L. species (Asteraceae) Genet. Mol. Biol.
Bernardes,Ebenézer C.S.; Benko-Iseppon,Ana M.; Vasconcelos,Santelmo; Carvalho,Reginaldo; Brasileiro-Vidal,Ana C..
Endive (Cichorium endivia L.) and chicory (C. intybus L.) both have 2n = 18, but until now, there has been no detailed karyomorphological characterization. The present work evaluated five accessions of each species using FISH with rDNA probes and fluorochrome staining with CMA and DAPI. Both species presented distinct banding patterns after fluorochrome staining: while endive had proximal CMA++/DAPI- bands in the short arms of pairs 1, 2 and 3, chicory had proximal CMA-positive bands in chromosomes 1 and 3 and interstitial in the short arm of chromosome 8. Among endive accessions, FISH procedures revealed conserved position and number of 5S and 45S rDNA sites (two and three pairs, respectively), associated with the CMA-positive bands. Notwithstanding,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Compositae; Cichorieae; CMA/DAPI; RDNA sites; Chromosome rearrangements.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572013000300010
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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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Karyological features and banding patterns in Arachis species belonging to the heteranthae section. Repositório Alice
SILVA, S. C.; MARTINS, M. I. G.; SANTOS, R. C. dos; PENALOZA, A. D. P. de S.; MELO FILHO, P. A.; BENKO-ISEPPON, A. M.; VALLS, J. F. M.; CARVALHO, R..
2010
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Evolução cromossômica; CMA/DAPI; Espécie de amendoim; Arachis.
Ano: 2010 URL: http://www.alice.cnptia.embrapa.br/handle/doc/872574
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Karyotype characterization and evolution of chromosome number in Cactaceae with special emphasis on subfamily Cactoideae Acta Botanica
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
Registros recuperados: 6
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