I don't know about wheat, but I know maize has a significant amount of gene duplication. https://genome.cshlp.org/content/11/1/55.full https://genome.cshlp.org

I don't know about wheat, but I know maize has a significant amount of gene duplication. https://genome.cshlp.org/content/11/1/55.full https://genome.cshlp.org/content/11/1/55.full Does the figure you quote for wheat take that into account?