Abstract
The accumulation of carotenoids, phytol and chlorophyll in etiolated wheat seedlings during exposure to white light was determined after treatment with the herbicides amitrol'l), Sandoz 6706 and Sandoz 9789. The Sandoz herbicides inhibit the accumulation of carotenoid, phytol, and chlorophyll to the same extent. The accumulation of chlorophyll is, however, more strongly inhibited by the action of amitrol than that of carotenoids and less strongly than that of phytol. The main carotene to be detected after amitrol inhibition was lycopene. Amitrol inhibition leads to the accumulation of new chlorophyll species (isolated as pheophytins) which contain all-trans-geranylgeraniol and dihydrogeranylgeraniol instead of phytol. The alcohols were isolated after saponification of the corresponding pheophytin fractions and identified by thin layer and gas chromatography and mass spectrometry. The new chlorophylls are considered to be intermediates in chlorophyll biosynthesis.
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