Eudicot paleohexaploidy

This event refers to the paleohexaploid origins of all sequenced eudicots to date, sampled from the eurosids and asterids. The ancestor to the radiation of these lineages was a hexaploid. The first published evidence for this came from the syntenic analysis of the grape genome. The syntenic dotplot of grape's genome to itself showed that each region of its genome was syntenic to two other intragenomic regions. This can be most easily and parsimoniously explained if grape was an ancient hexaploid. Further analysis showed that this event was shared in all other sequenced rosid genomes, and subsequently in asterid genomes.