Origin of pisatin demethylase (PDA) in the genus Fusarium

► The pathogenicity gene pisatin demethylases (PDA) has been sequenced from 23 fusaria isolates. ► The phylogenetic history of PDA, beta-tubulin, and elongation factor 1-alpha were compared. ► The genealogy of PDA was incongruent with the understood organismal phylogeny. ► The discordance illustrates involvement of horizontal gene transfer of this pathogenicity gene.