4.2 Article

First cytogenetic characterization of the Amazon Catfish Leiarius marmoratus (Gill, 1870) and its hybrid with Pseudoplatystoma reticulatum (Eigenmann & Eigenmann, 1889)

期刊

CARYOLOGIA
卷 74, 期 1, 页码 127-133

出版社

FIRENZE UNIV PRESS
DOI: 10.36253/caryologia-1149

关键词

Pimelodidae; Hybrid karyotype; Cachandia; Pintado da Amazonia; Yaque; Ag-NOR

资金

  1. Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP)
  2. Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq)

向作者/读者索取更多资源

This study reports the cytogenetic characterization of an Amazonian catfish Leiarius marmoratus and its hybrid with Pseudoplatystoma reticulatum, showing differences in karyotype formula and size of chromosome pair with nucleolus organizer region (Ag-NOR). The hybrid displayed an intermediate karyotype compared to parental species, with Ag-NOR serving as a chromosome marker for differentiation. Insights into chromosomal features of L. marmoratus and novel cytogenetic information within the Pimelodidae family were also provided.
This study reports the first cytogenetic characterization of the Amazonian catfish Leiarius marmoratus (jandia) and its F-1 (first generation) hybrid cachandia with Pseudoplatystoma reticulatum (cachara). A diploid number of 56 chromosomes and a single argyrophilic nucleolus organizer region (Ag-NOR) in the short arm of two sub-telocentric chromosomes were observed for both L. marmoratus and P. reticulatum, but with differences in the karyotype formula and the size of the chromosome pair with NORs. The hybrid showed 2n = 56 chromosomes with an intermediate karyotype when compared to the parental species. A single Ag-NOR was maintained in the hybrid but located in two chromosomes with marked differences in size and presenting intraindividual variation in NOR activity (nucleolar dominance). For L. marmoratus and the hybrid, heterochromatic bands were predominately distributed in the terminal, centromeric, and sub-centromeric regions of some chromosomes and 5S rDNA sites located in two distinct sub-telocentric chromosomes, similar to the previously described for P. reticulatum. The data suggested that the hybrid karyotype might be insufficient for a precise discrimination of hybrids, however, Ag-NOR can be used as a chromosome marker to differentiate cachandia from L. marmoratus and P. reticulatum. The current study also provides insights into the chromosomal features of L. marmoratus and contributes with novel cytogenetic information of this native Amazonian catfish included in the Pimelodidae family.

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