Here, we have demonstrated that the establishment of interactions between the diverged regulatory networks in allopolyploids is accompanied by massive homoeolog-specific up- and down-regulation of gene expression.
Rift volcanoes form when magma rises into the gap between diverging plates.
Close coevolution contributes toward exacerbating functional incompatibilities between diverging backgrounds.
Interaction between the diverged ancestral genomes in newly formed allopolyploids plays an important role in evolution by generating new functional variation and contributing to increased vigor and fertility, broader adaptability and phenotypic variability of polyploid species [ 1, 3, 67, 68].
The role of interaction between the diverged regulatory elements in modulating the expression of homoeologous genes in polyploids is confirmed by our data, which shows that 84% of non-additive changes in gene expression in SN can be explained by the transcription divergence between Ae. tauschii and Tetra-Cantach.
(2) Transgressive morphologies in hybrids should be enhanced in the second generation and following ones due to complex genomic and epistatic interactions between the two diverging genomes, including the complementing effects of alleles accumulated in each parental group [ 38- 41].
In addition, details of interactions may have diverged for paralogous pairs.
Hybrid incompatibilities such as sterility and lethality are commonly modeled as being caused by interactions between two genes, each of which has diverged separately in one of the hybridizing lineages.
In this case, higher rates of substitution in the nuclear genome may be contributing to the formation of incompatibilities between diverging populations, either by generating BDM incompatibilities between the nuclear genomes or through interactions between the nuclear and organelle genomes.
In contrast, whereas our data indicate important dissociations and interactions between tonic and phasic pupil dilation, the present results diverge from prior theoretical accounts regarding the relationship between the these two components (Gilzenrat et al., 2010).
