Pinus pinaster
Homologues for ADT have been isolated in "Arabidopsis thaliana ("rabbit-ear cress")", "Nicotiana sylvestris" (tobacco), "Spinacia oleracea" (spinach), "Petunia hybrida", "Sorghum bicolor", "Oryza sativa", and "Pinus pinaster" which are all considered higher-order plants. "Erwinia herbicola" and "Pseudomonas aeruginosa" are known to have homologues for cyclohexadienyl dehydratase. Of the plants with ADT homologues, both "Arabidopsis thaliana", "Petunia hybrida", and "Pinus pinaster" are known to have paralogues for the gene (six, three, and nine, respectively).