Estudos citogenéticos de quatro populações de Rhamdia quelen da região do Triângulo Mineiro

• Autor(a) principal: Silva, Sabrina Vaz dos Santos e
• Data de Publicação: 2007
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da UFU
• Texto Completo: https://repositorio.ufu.br/handle/123456789/15778
• topic: Rhamdia; Citogenética; Peixes; Cromossomos; Genética animal; Peixe - Genética; Rhamdia; Cytogenetic; Fish; Chromosome; CNPQ::CIENCIAS BIOLOGICAS::GENETICA

Cytogenetic studies were performed in three populations of Rhamdia quelen in Uberlândia-MG and one in Prata-MG. The results obtained evidenced a diploid number 2n=58 with 0-2 supranumerary chromosomes. The Nucleolus Organizer Regions were identified by silver nitrate and the NOR evidenced a simple heteromorphic NOR system. The three populations showed Ag-NOR in the short arm of the subtelo/acrocentric chromosome pair, in the Tijuco s population the NOR is located on the intersticial region of the submetacentric pair. The preparations were stained with the specific G-C fluorochrome CMA3, some of the chromosomes exhibited a pale fluorescence, indicating other regions richness in G-C base pairs beyond the NORs. The C band pattern showed small heterochromatic blocks in the centromeric and telomeric regions. In the attempt of a complete characterization, Restriction Endonuclease Banding, Hoechst 33258 and Cd-banding were applied. This study confirms some results of literature and show new important results for the better understanding this specie.