Plants adopt a series of strategies to tolerate solar UV-B radiation (with the side effects growth reduction), but positive have not been yet clarified. In this study, two cultivars with different leaf thickness for Chestnut rose (Rosa roxburghii Tratt), pioneering species ecological restoration in Karst region Southwest China, were employed investigate its responses ultraviolet-B (UV-B) exclus...

Ultraviolet (UV) radiation and reactive oxygen species (ROS) impair the physiological functions of retinal pigment epithelium (RPE) cells by inducing cell apoptosis, which is the main cause of age-related macular degeneration (AMD). The mechanism by which UV/ROS induces RPE cell death is not fully addressed. Here, we observed the activation of a ceramide-endoplasmic reticulum (ER) stress-AMP ac...

In plants subjected to UV-B radiation, responses are activated that minimize damage caused by UV-B. The bZIP transcription factor ELONGATED HYPOCOTYL5 (HY5) acts downstream of the UV-B photoreceptor UV RESISTANCE LOCUS8 (UVR8) and promotes UV-B-induced photomorphogenesis and acclimation. Expression of HY5 is induced by UV-B; however, the transcription factor(s) that regulate HY5 transcription i...

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 indic...

One way that aerobic biological systems counteract the generation of reactive oxygen species (ROS) is with superoxide dismutase proteins SOD1 and SOD2 that metabolize superoxide radicals to molecular oxygen and hydrogen peroxide or scavenge oxygen radicals produced by the extensive oxidation-reduction and electron-transport reactions that occur in mitochondria. We characterized SOD1 and SOD2 of...

Almost all environmental stresses induce oxidative stress in plants as an early and rapid response (Bolkhina et al., 2003). Under drought stress, overproduction of highly reactive oxygen species (ROS) in chloroplasts, represented by the superoxide anion (O2 ·-), hydrogen peroxide (H2O2), hydroxyl radical (·OH) and singlet oxygen (O2) has been reported (Smirnoff, 2002; Foyer and Noctor, 2003). T...

in this work, zno/sio2 nanoparticles were prepared using sol-gel method, and platinum particles were loaded on zno/sio2 nanoparticles by photoreductive method. samples were characterized by x-ray diffraction (xrd), scanning electron microscopy (sem) and fourier transform infrared spectroscopy (ft-ir). the xrd patterns showed that the zinc oxide samples have a wurtzite structure (hexagonal phase...