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Phytochrome-mediated Carotenoids Biosynthesis in Ripening Tomatoes ¹

^a Department of Food Science, Clemson University, Clemson, South Carolina 29631, Department of Biochemistry, Clemson University, Clemson, South Carolina 29631

Red light induced and far red light inhibited carotenoid biosynthesis in ripening tomatoes (Lycopersicon esculentum Mill.) when compared to controls kept in the dark. Red illumination following far red illumination reversed the inhibitory action of far red light on carotenoid biosynthesis, suggesting a phytochrome-mediated process. Quantitation of individual carotenoids favored the hypothesis of two separate carotenoid biosynthetic pathways in tomatoes.

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