Nucleolar Dominance in a Tetraploidy Hybrid Lineage Derived From red var. () × ().

Nucleolar dominance is related to the expression of genes inherited from one progenitor due to the silencing of the other progenitor's genes. To investigate nucleolar dominance associated with tetraploidization, we analyzed the changes regarding the genetic traits and expression of genes in tetraploidy hybrid lineage including F allotetraploids (4n = 148) and F autotetraploids (4n = 200) derived from the distant hybridization of red var. (2n = 100) () × (2n = 48) (). Results showed that nucleolar dominance from the females was established in F hybrids and it was inherited in F 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.