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Plant and Cell Physiology, 1991, Vol. 32, No. 5 603-607
© 1991

Article

Participation of Phytochrome in the Photoregulation of Terpenoid Synthesis in Thyme Seedlings

Takao Yamaura, Shigeo Tanaka and Mamoru Tabata

Faculty of Pharmaceutical Sciences, Kyoto University Kyoto, 606 Japan

The exposure of dark-grown, 4-day-old seedlings of thyme (Thymus vulgaris L.) to red light (2.0 W m–2) for 30 min caused a significant increase in the levels of yff-caryophyllene, ?-sitosterol, and carotenoids in cotyledons. This photoresponse proved to be reversible by alternate 30-min periods of irradiation with red and far-red (2.0 W m–2) light, indicating the participation of phytochrome in the photoregulation of terpenoid synthesis. Such photoreversibility was also observed in the case of catabolism of carbohydrates in the etiolated cotyledons.

(Received January 8, 1991; Accepted April 8, 1991)
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