Highlights• A single subgenome in allopolyploids may contribute to the majority of the
phenotype.• Methylation of transposons near genes is associated with subgenome …

The classical example of nonadditive contributions of the two parents to allopolyploids is
nucleolar dominance, which entails silencing of one parental set of ribosomal RNA genes …

Highlights•Many recent and ancient allopolyploids exhibit subgenome
dominance.•Extensive homoeologous exchanges complicate accurate subgenome …

Polyploidization is important to the evolution of plants. Subgenome dominance is a distinct
phenomenon associated with most allopolyploids. A gene on the dominant subgenome …

Whole-genome duplications happen repeatedly in a typical flowering plant lineage.
Following most ancient tetraploidies, the two subgenomes are distinguishable because one …

Subgenome dominance is an important phenomenon observed in allopolyploids after whole
genome duplication, in which one subgenome retains more genes as well as contributes …

Recent studies have shown that one of the parental subgenomes in ancient polyploids is
generally more dominant, having retained more genes and being more highly expressed, a …

Contents Summary 87 I. Introduction 87 II. Evolution in action: subgenome dominance within
newly formed hybrids and polyploids 88 III. Summary and future directions 90 …

Highlights•Hybridity and ploidy induce nonadditive gene expression (activation or
silencing).•Nonadditive gene expression is largely dependent on epigenetic …

Background The growing wealth of knowledge on whole-plant genome sequences is
highlighting the key role of transposable elements (TEs) in plant evolution, as a driver of …