Figure 1. Glossary of terms.

Diagram outlining the meanings of terms relating to allopolyploid transcription that are used in this study, and which derive from Yoo et al. [46]. Illustrated is an example of a gene, “A”, that is present as orthologs in the parents E8 and AR5, and as homeologs in the allopolyploid Lp1. The three homeolog expression terms are possible outcomes for relative gene expression in the allopolyploid. Homeolog expression bias: differential expression is not found between the two orthologs, but has arisen in the allopolyploid [43]. Homeolog expression blending: expression differences between the two orthologs have been lost in the allopolyploid. Homeolog expression reversal: the highly expressed ortholog has lower expression than the other homeolog in the allopolyploid.