Data/hora: 10/06/2024 13:32:05

Provedor de dados: | 83
País: | Brazil
Título: | Karyotype analysis of three species of Corydoras (Siluriformes: Callichthyidae) from southern Brazil: rearranged karyotypes and cytotaxonomy
Autores: | Barbosa,Patrícia; Pucci,Marcela B.; Nogaroto,Viviane; Almeida,Mara C.; Artoni,Roberto F.; Vicari,Marcelo R.
Data: | 2017-01-01
Ano: | 2017
Palavras-chave: | Cytosystematics; Heterokaryotypes; Karyotype description; RDNA; Vicariance.
Resumo: | ABSTRACT The genus Corydoras comprises a diversity of species with different diploid numbers. We compared cytogenetic data among Corydoras species from different rivers of the Ponta Grossa Arch region in southern Brazil. Corydoras ehrhardti and C. aff. paleatus have a similar karyotype formula and the same diploid number (2n = 44). Corydoras lacrimostigmata has a higher diploid number, with 2n = 58 chromosomes. Fluorescence in situ hybridization using 5S and 18S ribosomal DNA probes suggests that these ribosomal DNA sequences are involved in chromosomal rearrangements in these Corydoras species. 5S rDNA is a chromosomal marker that is considered to be unique to the species analyzed in this study. Signals of interstitial telomeric sites are seen in a chromosome pair of C. lacrimostigmata, suggesting chromosomal rearrangements via fusions or translocations. This study revealed that C. ehrhardti and C. aff. paleatus have exclusive chromosomal markers associated with chromosome differentiation, which we speculate to prevent genetic introgression.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252017000100222
Editor: | Sociedade Brasileira de Ictiologia
Relação: | 10.1590/1982-0224-20160056
Formato: | text/html
Fonte: | Neotropical Ichthyology  v.15 n.1 2017
Fonte: | info:eu-repo/semantics/openAccess