Variability evaluation of Go and F1 generations of GIFT Nile tilapia strain (Oreochromis niloticus) by RAPD - DOI: 10.4025/actascianimsci.v30i2.4708

• Autor(a) principal: Lupchinski Junior, Enio
• Data de Publicação: 2008
• Outros Autores: Vargas, Lauro, Povh, Jayme Aparecido, Ribeiro, Ricardo Pereira, Mangolin, Claudete Aparecida, Barrero, Nelson Maurício Lopera
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Acta Scientiarum. Animal Sciences (Online)
• Texto Completo: http://www.periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/4708
• topic: Shannon index; cultivated generations; genetic divergence; genetic variability; índice de Shannon; gerações de cultivo; divergência genética; variabilidade genética.

This study had as objective to analyze, by RAPD technique, the genetic variability and divergence of two GIFT Nile tilapia strain generations. Parameters were estimated for breeders (Go) and offspring (F1). The genetic variability was determined by the polymorphic loci percentage and Shannon index. The polymorphic loci percentages were 69.6% (Go) and 60.0% (F1). The Shannon index values were 0.367 for the Go generation and 0.317 for F1. Genetic divergence values, calculated using the Mantel test, were 0.213 for Go and 0.208 for the F1 generation. The results indicated that there was a genetic variability loss from the Go to F1 generation. However, it is important to observe the high genetic variability found for both the Go and F1 generations, which is a fundamental characteristic in order to obtain gains in breeding programs. The data also indicated that the genetic status is favorable to the continuing of the GIFT improvement program in Paraná State.