Occurrence of natural triploidy in Rhamdia quelen (Siluriformes, Heptapteridae).
Genet Mol Res
; 9(3): 1929-35, 2010 Sep 28.
Article
en En
| MEDLINE
| ID: mdl-20882489
ABSTRACT
Five specimens of Rhamdia quelen collected from the Lindóia Stream, PR, Brazil, were cytogenetically analyzed. The diploid chromosome number found was 58, including 30 metacentric, 16 submetacentric, 10 subtelocentric, and 2 acrocentric chromosomes. Supernumerary or B chromosomes, frequently observed in this fish group, were not detected. One of the individuals was triploid, with 3n = 87. A silver-stained nucleolar organizer region was found on a pair of submetacentric chromosomes of the diploid specimens, and on three chromosomes of the triploid individual, confirming triploidy. Treatment with fluorochrome chromomycin A(3) revealed fluorescent bands coincident with those of the silver-stained nucleolar organizer region, in both diploid and triploid individuals, showing that this is a GC-rich region. Heterochromatin distribution was visualized by the C-banding technique, mainly in the terminal chromosome regions of the individuals and was also observed in the pericentromeric regions of some chromosomes and at both telomeres.
Texto completo:
1
Colección:
01-internacional
Asunto principal:
Poliploidía
/
Bagres
Límite:
Animals
País/Región como asunto:
America do sul
/
Brasil
Idioma:
En
Revista:
Genet Mol Res
Asunto de la revista:
BIOLOGIA MOLECULAR
/
GENETICA
Año:
2010
Tipo del documento:
Article
País de afiliación:
Brasil