Abstract
The herbicide Comm and (2-(2-chlorophenyl)methyl-4,4-dimethyl-3-isoxazolidinone) does not affect the in vitro activities of the plastid enzymes catalyzing the steps leading from isopen tenyl diphosphate to geranylgeranyl diphosphate and phytoene, i.e. the isopentenyl diphos phate isomerase, prenyl transferase and phytoene synthase. The extractable activities of these enzymes in herbicide-treated seedlings are also not affected. Nevertheless, the synthesis of chlorophylls and carotenoids in treated seedlings is severely inhibited in vivo. The mode of action of Comm and remains still unknown.
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