LED-enhanced biosynthesis of biologically active ingredients in callus cultures of Ocimum basilicum.

Ocimum basilicum is a medicinal plant with multiple health benefits including cardiovascular, cancer and diabetics. In the present study, the influences of light emitting diodes (LEDs) were investigated on the accumulation of biologically active ingredients in callus cultures of Ocimum basilicum. Among the various tested treatments optimum levels of Total phenolic content (TPC) was noted in callus culture grown under blue lights as compared to control, while maximum accumulation of Total flavonoid content (TFC) was noted in callus culture grown under red light as compared to control. HPLC analyses showed that highest concentrations of Rosmarinic acid (96.0 mg/g DW) and Eugenol (0.273 mg/g DW) were accumulated in blue light which was 2.46 and 2.25 times greater than control (39.0 mg/g DW, 0.171 mg/g DW), respectively. Chicoric acid (81.40 mg/g DW) optimum accumulation was noted in callus grown under the continuous white light, which was almost 4.52 times greater than control. Anthocyanins content were also analyzed, the highest amount of Peonidin (0.127 mg/g DW) and cyanidin (0.1216 mg/g DW) were found in callus culture grown under red light. These findings suggest that application of LED's is a promising strategy for enhancing production of biologically active ingredients in callus cultures Ocimum basilicum.