The changes in chlorophyll content, antioxidant enzyme activities and senescence in Chinese kale (Brassica oleracea var. alboglaba) irradiated with different UV-C dosages (1.8, 3.6, 5.4 and 7.2 kJ m-2) were determined during storage at 20°C. The irradiation dose of 3.6 and 5.4 kJ m-2 delayed leaf yellowing depicted as higher hue values and chlorophyll contents and lower activity of chlorophylla...

Leaf senescence is a typical symptom in plants exposed to dark and may be regulated by plant growth regulators. The objective of this study was to determine whether exogenous application of melatonin (N-acetyl-5-methoxytryptamine) suppresses dark-induced leaf senescence and the effects of melatonin on reactive oxygen species (ROS) scavenging system and chlorophyll degradation pathway in perenni...

Background: This study examined the effect of grape seed proanthocyanidin extract (GSPE) on lipid peroxidation content and activity of tissue antioxidant enzymes, including catalase, superoxide dismutase and glutathione peroxidase in diabetic rats. Methods: Thirty male rats were divided into three groups of 10 rats each: control, diabetic and diabetic groups that received 500 mg/kg GSPE for 6 w...

Electromagnetic field (EMF) causes fundamental alternations in biological systems. In this study, we studied the effects of EMF on physiological responses and secondary metabolites production SiO2 NP-treated Anthemis gilanica plants. The results indicated that improved plant growth by inducing chlorophyll carotenoid content, which led to enhanced biomass adventitious roots treatment activity an...

Herbicide plays the main role in guaranteeing the quantity and quality of food. Soybean reactive oxygen species scavenging system eliminates the herbicides’ side effects on the plant by activating antioxidant enzymes, which affects the yield. So, we investigated this procedure to reveal the effect of herbicides on food production. Methods: Experiments were carried out in two locations of Alborz...

The diurnal and seasonal temperature rising patterns "asymmetric warming," plays an important role in crop distribution and productivity. Asymmetric warming during the early growth periods of winter wheat (Triticum aestivum L.) profoundly affects vegetative growth and post-anthesis grain productivity, but the underlying physiological mechanism is still unclear. We conducted field experiments fr...

Heat shock proteins are induced at normal temperatures by oxidants and during reoxygenation following hypoxia. We now report cyanide-resistant O2 consumption increased 30-50% in rat lungs exposed to heat shock or reoxygenation following hypoxia. The synthesis of Cu,Zn superoxide dismutase, but not Mn superoxide dismutase, was increased in rat lung slices by in vivo hyperthermia (39 degrees C), ...

Nitric oxide (NO) is a bioactive molecule, which was found to have several physiological roles, including antioxidant. To have a better understanding of the effects of NO concentrations (0, 0.1 and 0.2 mM) on germination, growth, photosynthetic pigments, lipid peroxidation and antioxidant activity of basil (Ocimum basilicum L.) under different salinity concentrations (0, 100 and 200 mM of NaCl)...