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The influence of plant growth regulators on biomass growth and the accumulation of medicinally-relevant isoflavone phytoestrogens, derivatives of genistein and daidzein (8 compounds including aglycones, glucosides and glucoside esters) in callus cultures of  (Fabaceae) was examined. The experiments included 10 auxins [2,4-dichlorophenoxyacetic acid (2,4-D), p-chlorophenoxyacetic acid, indole-3-acetic acid, indole-3-butyric acid, indole-3-propionic acid, 1-naphthaleneacetic acid, -naphthoxyacetic acid, picloram, 2,3,5-triiodobenzoic acid (TIBA), 2,4,5-trichlorophenoxyacetic acid (2,4,5-T)] and 7 cytokinins [6-benzylaminopurine, forchlorfenuron, 1,3-diphenylurea, 2-isopentenyladenine, kinetin (KIN), thidiazuron, zeatin] applied at 0.5 and 5.0 mg l, jointly with 5.0 or 0.5 mg l KIN or 2,4-D (for auxins and cytokinins, respectively—36 phytohormone combinations in total). Statistical analysis of the relationships between callus growth [expressed as growth index (Gi)] and the accumulation of isoflavones showed positive correlation in the cytokinin group (r values from 0.13 to 0.61) and negative correlation within auxins (r values from −0.31 to −0.39). Among the cytokinins tested, the highest isoflavone content (6,436.26 mg/100 g dry weight) and the fastest biomass growth (Gi = 892.46 %) were obtained for 0.5 mg l KIN used jointly with 5.0 mg l 2,4-D. In the group of auxins, the combination of 0.5 mg l TIBA and 5.0 mg l KIN provided the fastest culture growth (Gi = 983.07 %) and the isoflavone concentration of 10,474.23 mg/100 g dry weight, which is so far the highest amount of these metabolites achieved in callus cultures of higher plants.

plant cell, tissue and organ culture

Plant growth regulators affect biosynthesis and accumulation profile of isoflavone phytoestrogens in high-productive in vitro cultures of Genista tinctoria