Effects of UV-B and Far-Red Light Irradiation on the Growth and Active Component Accumulation in Scutellaria baicalensis Seedlings

The combined UV-B+FR treatment exhibited a synergistic effect: on one hand, it alleviated UV-B-induced stress damage, increasing root dry weight by 45.13% compared with UV-B alone; on the other hand, it significantly enhanced the synthesis of flavonoids, with baicalin and wogonoside contents increased by 4.30% and 13.85%, respectively, relative to the control. At 10 days of treatment, UV-B and FR significantly affected antioxidant enzyme activities and chlorophyll fluorescence parameters; after 30 days, S. baicalensis showed adaptive recovery with increased chlorophyll content.

In conclusion, the combined UV-B and FR treatment regulates the growth and development of S. baicalensis seedlings and promotes the accumulation of medicinal components. These findings provide a theoretical basis for manipulating the light environment in the artificial cultivation of medicinal plants.