Data/hora: 11/06/2024 07:00:56

Provedor de dados: | 52
País: | Brazil
Título: | Cytotaxonomy, heterochromatic polymorphism and natural triploidy of a species of Astyanax (Pisces, Characidae) endemic to the Iguaçu river basin
Autores: | Kantek,Daniel Luis Zanella; Noleto,Rafael Bueno; Fenocchio,Alberto Sérgio; Cestari,Marta Margarete.
Data: | 2007-01-01
Ano: | 2007
Palavras-chave: | Cytogenetics; Triploidy; Paracentric inversion.
Resumo: | Cytogenetic analysis with Astyanax sp. D revealed a karyotype of 2n=50 with 2M+26SM+6ST+16A, besides a triploid specimen showing 2n=75 chromosomes (3M+39SM+9ST+24A). C-banding strongly stained the terminal regions of several SM-ST-A chromossomes. Two pairs of acrocentric chromosomes presented interstitial heterochromatin, this state being polymorphic and occuring due to possible paracentric inversions. The results obtained with the AluI restriction enzyme and A3 chromomycin were similar to the C-banding. Relationships were proposed between Astyanax sp. D and A. scabripinnis, as well as considerations for a possible origin of the triploid specimen (2n=3x=75). When comparing the present results with cytogenetic features of other endemic Astyanax species in the Iguaçu river (A. sp. B and C), a clear differentiation was observed between them, indicating cytogenetics as an important cytotaxonomic tool.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132007000100008
Editor: | Instituto de Tecnologia do Paraná - Tecpar
Relação: | 10.1590/S1516-89132007000100008
Formato: | text/html
Fonte: | Brazilian Archives of Biology and Technology  v.50 n.1 2007
Fonte: | info:eu-repo/semantics/openAccess