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Effects of Dichloropropenes and Aliphatic Compounds on Synthesis and Degradation of Carotenoids1,2,3


Plants grown in dichloropropene (a soil fumigant) treated soil have significantly higher than usual carotenoid levels. Treatments with dichloropropenes, 3-chloroallyl alcohol, 3-chloropropionic acid, 3-hydroxypropionic acid, 3-chloro-l-propanol and malonic acid decreased the incorporation of β-hydroxy-β-methylglutaric acid and mevalonic acid into carotenoids of etiolated maize. Lipoxidase in tomato was inhibited by much lower concentrations of these compounds than were required to inhibit the incorporation of β-hydroxy-β-methylglutaric acid or mevalonic acid. This difference could account for the eventual increase in the total carotenoids in the plant.