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Extracts from the biomass of Ruta graveolens and Ruta graveolens ssp. divaricata cultured in vitro under different light conditions (far-red, red and blue light, UV-A irradiation, in darkness and white light) were tested for the amounts of free phenolic acids and cinnamic acid (twelve compounds) as well as furanocoumarins and umbelliferone (seven compounds) using HPLC methods. Total amounts of the investigated groups of compounds in the cultures of both plants increased from 2.6 to 6.7 times, depending on light quality, and the maximum values reached were 106.50 and 1,276.74 mg 100 g−1 DW (in R. graveolens), and 106.97 and 262.54 mg 100 g−1 DW (in the subspecies), respectively. Both white light and blue light were equally beneficial for the total production of phenolic acids in cultures of both plants, whereas the total production of furanocoumarins was clearly better stimulated by blue light in R. graveolens and by darkness in the subspecies (i.e. the amounts were respectively 1.44 and 1.7 times higher than in the biomass cultivated under white light). The amounts of individual compounds in both plant cultures increased from about 2.2 to 26.3 times depending on light quality. The following bioactive compounds were obtained in quantities which are of interest from a practical perspective: in R. graveolens culture—protocatechuic acid (45 mg 100 g−1 DW), isopimpinellin (about 500 mg 100 g−1 DW) and bergapten (about 270 mg 100 g−1 DW), and in the subspecies culture: p-coumaric acid (70 mg 100 g−1 DW) and isopimpinellin (about 210 mg 100 g−1 DW).

plant cell, tissue and organ culture

Production of bioactive phenolic acids and furanocoumarins in in vitro cultures of Ruta graveolens L. and Ruta graveolens ssp. divaricata (Tenore) Gams. under different light conditions