Data/hora: 02/06/2024 05:33:11

Provedor de dados: | Genetics and Molecular Biology
País: | Brazil
Título: | Cytogenetic divergence between two sympatric species of Characidium (Teleostei, Characiformes, Crenuchidae) from the Machado River, Minas Gerais, Brazil
Autores: | Silva,Alexandre Rodrigues da; Maistro,Edson Luis.
Data: | 2006-01-01
Ano: | 2006
Palavras-chave: | Characidium gomesi; Characidium cf. zebra; Crenuchidae; NOR-banding; C-banding.
Resumo: | Cytogenetic studies were performed on two sympatric species of Characidium, C. gomesi and C. cf. zebra, from the Grande River basin, Minas Gerais State, Brazil. Although both species had a chromosome number of 50 with a karyotype exclusively consisting of meta- and submetacentric chromosomes, interspecific diversity was detected concerning the size of the two first chromosome pairs of the karyotypes. Active nucleolus organizer regions (NORs) were located at the terminal position on the long arm of the 17th pair of C. gomesi and at subterminal position on the long arm of the 23rd pair of C. cf. zebra. For both species the fluorochrome CMA3 stained only the NOR-bearing pair of chromosomes. The heterochromatin pattern also showed some differentiation between these species restricted to the centromeric or pericentromeric region of C. cf. zebra and practically absent in C. gomesi. These data are discussed concerning chromosome diversification in this fish group.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572006000300010
Editor: | Sociedade Brasileira de Genética
Relação: | 10.1590/S1415-47572006000300010
Formato: | text/html
Fonte: | Genetics and Molecular Biology  v.29 n.3 2006
Fonte: | info:eu-repo/semantics/openAccess