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Nucleolar dominance is related to the expression of  45S rRNA  genes inherited from one progenitor due to the silencing of the other progenitor’s  rRNA  genes. To investigate nucleolar dominance associated with tetraploidization, we analyzed the changes regarding the genetic traits and expression of  45S rRNA  genes in tetraploidy hybrid lineage including F 1  allotetraploids (4n = 148) and F 2  autotetraploids (4n = 200) derived from the distant hybridization of  Carassius auratus  red var. (2n = 100) (  ) × Megalobrama amblycephala  (2n = 48) (  ). Results showed that nucleolar dominance from the females was established in F 1  hybrids and it was inherited in F 2  hybrids, suggesting that tetraploidization can lead to rapid establishment of nucleolar dominance in the hybrid origin’s tetraploid lineage. These results extend the knowledge of nucleolar dominance in polyploidy hybrid animals, which are of significance for the evolution of hybrids in vertebrates.

Nucleolar Dominance in a Tetraploidy Hybrid Lineage Derived From Carassius auratus red var. () × Megalobrama amblycephala ()