Effect of ultraviolet-B radiation on biomass production, lipid peroxidation, reactive oxygen species, and antioxidants in Withania somnifera

Ultraviolet-B radiation applied to detached peach fruit: A study of free radical generation by EPR spin trapping

“…Similarly, after 60 s of UV-B treatment, oxygen-centred free radicals increased more in the longer-term pre-treated samples (Fig. 7B), further confirming findings in Withania somnifera by Takshak and Agrawal (2014) that UV-B treatment is an oxidative stress that triggers peroxidative processes.…”

“…Indeed, it is known that shelf life of fruits and vegetables is generally extended in anaerobic conditions. High UV-B radiation exposure causes conditions similar to oxidative stress, resulting from additional ROS generation (Hideg et al, 2013) and it was demonstrated that Withania somnifera plants experienced lipid peroxidation (Takshak and Agrawal, 2014). The right balance among UV-B supplemental dose, duration of treatment as well as induction of antioxidant synthesis could represent the recipe to obtain fruits which can sustain optimal storage conditions and may contribute to an antioxidant rich diet with important health benefits.…”

“…However, easier general mechanisms of harmful ROS production could involve the direct UV photocleavage of H 2 O 2 (Hideg and Vass, 1996) or Fenton-type reactions, both giving rise to OH . , the most reactive ROS responsible for tissue damage including lipid peroxidation (Takshak and Agrawal, 2014).…”

Heteropogon contortusBL‐1 (Pilli Grass) and Elevated UV‐B Radiation: The Role of Growth, Physiological, and Biochemical Traits in Determining Forage Productivity and Quality

“…At 75 DAG, minimum increase in MDA was observed due to eUV-B which could be because of higher inductions of antioxidative enzymes such as APX, CAT, and SOD involved in detoxification of ROS. The results of this study are in agreement to other findings obtained in Linum usitatissimum (37), Helianthus annuus (38), Withania somnifera, and Coleus forskohlii (39,40). Disturbance in membrane integrity could be an important reason for the decline of various pigments.…”

“…In addition to nonenzymatic antioxidants, H. contortus showed also increments in enzymatic activities under eUV‐B with maximum induction of H 2 O 2 scavenging enzymes such as CAT and POX at early growth stages. Similar results were also reported by Takshak and Agrawal in W. somnifera exposed to eUV‐B. At 110 DAG, enzymatic activities showed pronounced decline which may be due to more allocation of biomass toward reproduction instead of antioxidative defense and it could also be attributed to sharp decline in ambient level of UV‐B.…”