Abstract
Increased forskolin yield was obtained in transformed root, rhizogenic calli and cell suspension cultures of Coleus forskohlii when treated alone with various concentrations of auxins (IAA, IBA, NAA, 2,4-0), auxin conjugates ( IAA-ala, IAA-gly, IAA-phe, IAA-asp), cytokinins (Kn, BAP) and gibberellic acid (GA3). An 8.9-fold stimulation in forskolin production was achieved in transformed rhizogenic line GCO-RCH-10 in presence of 1.0 mg I-1 GA3, 6-fold in cell suspension line GSO-5/7-k in presence of 2 mg I-1 BAP and 4.3-fold in root line RC-ST -2/16 in presence of 0.5 mg I-1 GA3 at the end of a culture period of 4 weeks. Growth and morphology was found to be influenced by the growth regulators studied. A seven fold increase in biomass was obtained in rhizogenic line GCO-RCH-10 with 0.5 mg I-1 GA3 In root line RC-ST-2/16, different concentrations of IAA, IAA conjugates and GA3 stimulated growth while cytokinins inhibited growth of roots. The shoot culture line ST -2/51/d, showed prolific growth in the presence of all cytokinins but no forskolin was detected in the shoot cultures treated with any of these hormones.
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