Differential responses of the scavenging systems for reactive oxygen species (ROS) and reactive carbonyl species (RCS) to UV-B irradiation in Arabidopsis thaliana and its high altitude perennial relative Arabis alpina

The present work aimed to compare antioxidant response and lipid peroxide detoxification capacity of an arctic-alpine species Arabis alpina its close relative model Arabidopsis thaliana under acute short duration (3 h 6 h) UV-B stress (4.6 8.2 W/m2). After 3 exposure UV-B, A. showed lower peroxidation H2O2 accumulation when compared thaliana. Moreover, Fv/Fm value dropped 0.70, while 0.75 indicating better protection PSII in this species. For elucidation the response, activities superoxide dismutase (SOD), catalase (CAT), peroxidase (POX), ascorbate (APX), glutathione reductase (GR) dehydroascorbate (DHAR) were measured. SOD induction with was more prominent alpina. Also, had higher chloroplastic FeSOD activity APX also significantly induced alpina, decreased at or did not change able maintain constant CAT activity, but drastic decreases observed both time points. induce aldehyde dehydrogenase (ALDH), alkenal reductases (AERs) glutathione-S-transferases (GST) opposite trend These findings indicate that maintain/induce defence conferring against UV-B.