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Photocontrol of Anthocyanin Synthesis

III. The Action of Streptomycin on the Synthesis of Chlorophyll and Anthocyanin ¹

^a Department of Biological Sciences, Columbia University, New York, New York 10027

Streptomycin enhances the synthesis of anthocyanins and inhibits the synthesis of chlorophylls and the development of chloroplasts in dark-grown seedlings of cabbage (Brassica oleracea), mustard (Sinapis alba), tomato (Lycopersicon esculentum), and turnip (Brassica rapa) exposed to prolonged periods of irradiation in various spectral regions. These results suggest that the contribution of photosynthesis to light-dependent high irradiance reaction anthocyanin synthesis in seedlings of cabbage, mustard, tomato, and turnip is minimal, if any at all. So far, phytochrome is the only photoreceptor whose action in the control of light-dependent anthocyanin synthesis in seedlings of cabbage, mustard, tomato, and turnip has been satisfactorily demonstrated.

³ Permanent address: Division of Biological Sciences, State University of New York, Stony Brook, N.Y. 11790.

¹ This research was aided by National Science Foundation Grant GB-35460 to A.L.M.

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