Cytogenetic data on Astyanax jacuhiensis (Characidae) in the lago Guaíba and tributaries, Brazil
Cytogenetic analyses were performed in Astyanax jacuhiensis from lago Guaíba, Brazil. The diploid number was 50, with a karyotype composed of 8m+30sm+4st+8a chromosomes, FN = 92. The AgNORs were observed in 2 to 5 chromosomes, with intra- and interindividual variation. The sm pair 8 observed always carried NORs on the short arms, presenting size heteromorphism between homologous. Fluorescence in situ hybridization (FISH) with an 18S rDNA probe only confirmed the location of ribosomal cistrons in the sm pair 8, and heteromorphism of these regions between the homologous chromosomes. C-banding revealed the occurrence of weak C-positive heterochromatin in the pericentromeric regions of several chromosomes, in addition to more evident bands interstitially located on some chromosome pairs and in the terminal region of the short arms in pair 8. C-banding plus CMA3 revealed light fluorescent signals in different chromosomes of the karyotype, with a strong terminal site in pair 8, indicating the occurrence of several GC-rich heterochromatic regions in this species. Our results provide the first description of the Astyanax jacuhiensis karyotype, showing karyotype similarities when compared to various populations of A. altiparanae and A. bimaculatus, indicating that chromosomal features are very similar for these three species.
Main Authors: | Pacheco,Rosiley B., Giuliano-Caetano,Lucia, Julio Junior,Horácio F., Dias,Ana L. |
---|---|
Format: | Digital revista |
Language: | English |
Published: |
Sociedade Brasileira de Ictiologia
2010
|
Online Access: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252010000300013 |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
Similar Items
-
Spatial and temporal biomarkers responses of Astyanax jacuhiensis (Cope, 1894)(Characiformes: Characidae) from the middle rio Uruguai, Brazil
by: Loro,Vania Lucia, et al.
Published: (2015) -
Cytogenetic study of two species of the family Pimelodidae (Siluriformes) collected in lago Guaíba, Rio Grande do Sul, Brazil
by: Treco,Fernando Rodrigo, et al.
Published: (2008) -
Cytogenetic analysis of Astyanax laticeps (Cope, 1894) (Ostariophysi: Characidae) from the laguna dos Patos system
by: Rosa,Renata da, et al.
Published: (2009) -
The occurence of black spot disease in Astyanax aff. fasciatus(characiformes: characidae) in the Guaíba Lake basin, RS, Brazil
by: Flores-Lopes,F
Published: (2014) -
Comparative cytogenetics in Astyanax (Characiformes: Characidae) with focus on the cytotaxonomy of the group
by: Tenório,Renata Cristina Claudino de Oliveira, et al.
Published: (2013)