The algal excretion product geranylacetone was proved to be an effective and novel inhibitor of carotene synthesis in Synechoccus 6911. The application of geranylacetone resulted in an accumulation of phytofluene, indicating an inhibition of the conversion of this compound into ξ-carotene. The cis-isomer of geranylacetone was as effective as the natural trans-isomer. The chlorophyll synthesis was only slightly affected.
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Friedrich Jüttner (1979) studied this question.