influence of UV-B radiation on polyamines, lipid peroxidation and membrane lipids in cucumber

UV‐B‐ and oxidative stress‐induced increase in nicotinamide and trigonelline and inhibition of defensive metabolism induction by poly(ADP‐ribose)polymerase inhibitor in plant tissue

“…UV-B can increase the polyamine levels [8], which increase PADPRP activity [38], which can in turn result in elevated NIC and TRIG levels. In response to UV-B exposure the ABA levels are reported to increase [39]and ABA can stimulate TRIG accumulation [26].…”

“…3-AB, 3-aminobenzamide; 3-MB, 3-methoxybenzamide; AAPH, 2,2'-azobis(2-amidinopropane)dihydrochloride; CHS, chalcone synthase; GSSG, oxidized glutathione; GSH, reduced glutathione; GSHtot, total glutathione; NIC, nicotinamide; PADPRP, poly(ADP-ribose)polymerase; PAL, phenylalanine ammonia-lyase; ROS, reactive oxygen species; TRIG, trigonelline; VOSO4, vanadylsulfate close to the plasma membrane is probably ozone. UV-B radiation may, depending on the wavelength and dose, reach different compartments of the cell and cause various types of effects, such as DNA damage [6], especially thymine dimerization, and oxidative damage, such as lipid peroxidation [7,8]. Certain compounds will interact primarily with DNA and cause damage at this level.…”

“…Exposure of plant tissue to UV-B light [8,18,19] or 2,2'-azobis(2-amidinopropane)dihydrochloride (AAPH) [20] is associated with increased antioxidative defense metabolism. Both UV-B [8] and AAPH [20] exposure are known to cause increased lipid peroxidation in plant tissue. Oxovanadium compounds cause secondary metabolite accumulation and activation of antioxidative metabolism in plant tissue [21,22].…”

Nicotinamide, a missing link in the early stress response in eukaryotic cells: A hypothesis with special reference to oxidative stress in plants

“…decreased temperature [30], 03 [31], UV-light [32], fungal elicitor [33], Cu 2+ [34] and SO2 [35] cause oxidative stress, which is reflected in increased levels of reduced and oxidized glutathione, as well as in a rise in the activity of glutathione reductase. An increase in the GSH level is often preceded by an increase in the level of GSSG.…”

Protective Effect of Humic Acids Against Heavy Metal Stress in Triticale

“…Both parameters are usually used to demonstrate oxidative injuries in plants provoked by various stress factors [ 20 ]. Typically, increased quantity of MDA is associated with negative effects of ROS on biomembrane integrity, which result in peroxidation and fragmentation of unsaturated fatty acids [ 11 ]. The changes of MDA and proline demonstrate that oxidative stress occurred in variants treated with HMs only.…”