Data/hora: 11/06/2024 05:33:23

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