Photosynthetic, Biochemical and Secondary Metabolite Changes in a Medicinal Plant Chlorophytum borivillianum (Safed musli) against Low and High Doses of UV‐B Radiation

Abstract

Plants are inevitably grown in presence of sunlight, therefore bound to be exposed to natural UV-B radiation. Several studies have already been conducted with UV-B and medicinal plants and only few studies showed dose dependent variation. The present study aims to find out the variations and adaptation in Chlorophytum borivillianum under two different doses of UV-B radiation; ambient + low (3.2 kJm À2 d À1 ) and high (7.2 kJm À2 d À1 ) UV-B dose, denoted as LD and HD, respectively. Reduction in photosynthetic rate was higher at HD, while plants receiving LD displayed nonsignificant variation. During vegetative and reproductive stage, significant reduction (P ≤ 0.001) in stomatal conductance was obtained when exposed to HD-eUV-B. F v /F m showed more reductions in HD-eUV-B (12.6%) followed by LD-eUV-B (7.9%). Low and high doses of UV-B enhanced the anthocyanin content but the increase was significant in HD, indicates epidermal protection strategy by the plants. Under LD-eUV-B, the content of saponin, a major phytochemical constituent was enhanced by 26%. Phytochemical analysis of roots revealed reduction mostly in fatty acid components whereas the steroidal components (stigmasterol and sarsasapogenin) showed enhancement in response to LD. The study suggests the importance of LD-eUV-B in the stimulation of medicinal compounds in C. borivillianum.

Pre-Harvest UVB Irradiation Enhances the Phenolic and Flavonoid Content, and Antioxidant Activity of Green- and Red-Leaf Lettuce Cultivars

“…ROS production in response to UVB is indicated by the H 2 O 2 content in this study, which was greater under higher doses of UVB. High ROS content was also observed in Chlorophytum borivillianum and grapevines under exposure to a higher amount of UVB [31,32]. Increases in H 2 O 2 production induces membrane lipid peroxidation, which is indicated by the level of MDA content [33].…”

Enhancement Rutin Production from Capparis spinosa Plant by UV-C or Gamma Irradiation using In vitro Culture

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The effect of edible coatings and ZnO nanoparticles based on Moringa extracts on the postharvest quality of avocado (persea americana mill.) fruit.

“…Like most treatments, there are still some limitations on the use of UV radiation. Exposing fruit to UV radiation for extended periods can negatively affect fruit chlorophyll and carotenoids (Jaiswal et al, 2023).…”