Flowering plants have witnessed multiple cycles of whole-genome duplication (WGD) over the past 200 million years of evolution. Typically, WGD increases genome size and gene content, followed by gene loss, or fractionation, depending on functional categories. Certain classes of genes are retained as duplicates for longer periods of evolutionary time. Duplicate genes provide a potential source of genome diversity and evolution of novel traits (Panchy et al., 2016). Comparative analysis of available genome sequence data provides valuable resources to understand gene duplication and the mechanisms behind duplicate gene retention. Genes involved in macromolecular complexes such as signal transduction and transcription factors are preferentially retained as duplicates, whereas these same gene classes are underrepresented in small-scale duplications (e.g., tandem duplication, transposition)…