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Plant and Cell Physiology, 1984, Vol. 25, No. 1 93-105
© 1984

Article

The Photoregulation of Anthocyanin Synthesis IX. The Photosensitivity of the Response in Dark and Light-Grown Tomato Seedlings1

Alberto L. Mancinelli and Owen M. Schwartz2

Department of Biological Sciences, Columbia University New York, NY 10027, U.S.A.

The photosensitivity of anthocyanin production in tomato seedlings is affected by age, duration of the light treatments, deetiolation and medium composition. Deetiolation brings about an enhancement in the extent of the inductive, red-far red reversible response and a decrease in the extent of the response to continuous irradiation. The changes in the spectral sensitivity of the response under continuous irradiations probably reflect an interaction between changes in the responsiveness of the biological system to the action of the photoreceptors and changes in the operational state of the photomorphogenic pigments. The results suggest a possible involvement of a UV-blue light photoreceptor (cryptochrome) in the photoregulation of anthocyanin production.

1Research supported by National Science Foundation grants PCM-7680932 and PCM-8008747 to A. L. M.

2Summer Research Fellow, J. Macy, Jr. Foundation.

(Received June 8, 1983; Accepted October 28, 1983)
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