This study was designed to investigate the dynamics of accumulation of linear furanocoumarins (psoralen, bergapten, xanthotoxin, isopimpinellin, imperatorin) and their biogenetic precursor, umbelliferone, in agitated cultures of Ruta graveolens L. and Ruta graveolens ssp. divaricata (Tenore) Gams during 6-week growth cycles. The metabolites under study were almost exclusively accumulated in the cultured biomass. The total content of all metabolites increased 4.8- and 2.0-fold, in R. graveolens and R. graveolens ssp. divaricata cultures, respectively. Xanthotoxin and bergapten, which are the most important therapeutic compounds, were the dominating metabolites in cultures of both plants. The maximum content of xanthotoxin (25.0 mg/100 g dry wt.) and bergapten (18.4 mg/100 g dry wt) and the maximum content of all metabolites (64.0 mg/100 g dry wt) in R. graveolens ssp. divaricata callus obtained on the 35th culture day were relatively low. However, maximum contents of xanthotoxin (136.8 mg/100 g dry wt), bergapten (210.4 mg/100 g dry wt.) and isopimpinellin (96.7 mg/100 g dry wt), and total content of all metabolites in R. graveolens shoots (520.8 mg/100 g dry wt) obtained on the 42nd culture day are interesting from a practical point of view.
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