imidazolinone plant exposure herbicide exposure imidazolinone exposure PECO:0007633 PECO_GIT:74 EO:0007633 This type of herbicides are taken up by plant root and leaf tissue and transported to the meristems via both phloem and xylem. The herbicide stops the activity of the enzyme, acetolactate synthase (ALS), which is involved in branch chain amino acid (valine, leucine and isoleucine) synthesis. imidazolinone treatment (narrow) plant_experimental_conditions_ontology An herbicide exposure (PECO:0007183) involving the use of an imidazolinone herbicide.