Phytochrome-mediated formation of terpenoids and glandular trichomes, and rapid tyrosine phosphorylation of a 25-kDa protein in thyme seedlings

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The exposure of dark-grown, 4-day-old seedlings of thyme(Thymus vulgaris L., Labiatae)to red light(2.0 Wm^<-2>)for 30 min caused a significant increase in the levels of mono, sesqui-, tri- and tetraterpenoids in cotyledons. This photoresponse proved to be reversible by alternate 30-min periods of irradiation with red and far-red(2.0 Wm^<-2>)light, indicating the participation of phytochrome in the photoregulation of the synthesis of various terpenoids. Such photoreversibility was also observed in the case of the formation of blandular trichomes, biosynthetic sites of monoterepenes, in the cotyledons. We recently found that R/FR photoreversibility was operative in the stimulation of rapid thyrosine phosphorylation of a 25000-Mr protein, suggesting that the activation of tyrosine kinase(s)could be involved in the signal transduction of phytochrome.