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- Publisher
- Springer Journals
- Copyright
- Copyright © 2000 by Springer-Verlag Berlin Heidelberg
- Subject
- Legacy
- ISSN
- 0721-7714
- eISSN
- 1432-203X
- DOI
- 10.1007/s002990000206
- Publisher site
- See Article on Publisher Site
Abstract
cv. Anthos) is presented. Isotope tracer experiments were performed on plantlets regenerated from thidiazuron-induced stem explants and grown on MS basal medium for 2 months. Radiolabel from 14 C-tryptophan was recovered as 14 C-indoleacetic acid, 14 C-tryptamine, 14 C-5-hydroxytryptophan, 14 C-serotonin and 14 C-melatonin in the treated St. John's wort plantlets. Chromatographic peak identity was confirmed by high performance liquid chromatography-mass spectrometry-mass spectrometry and quantification of melatonin by radioimmunoassay. Significantly more radiolabel was recovered in serotonin relative to melatonin under low light conditions with this ratio being reversed under increased lighting, indicating that the rate of flow through this biosynthetic pathway is regulated, at least in part, by light.
Journal
Plant Cell Reports – Springer Journals
Published: Jun 1, 2000