Effect of NaHCO3 on Membrane Lipid Peroxidation and Activity of Oxygen Scavenging Enzymes of Polygon sibricum Under NaHCO3 Effects of exogenous Ca on some physiological characteristics of tomato (Lycopersicon esculentum) seedlings with different Ca sensitivity Seasonal changes in enzymatic antioxidant system in roots of alpine perennial forage grasses related to freezing tolerance The response to water stress of the antioxidant system in maize seedling roots with different drought resistance Active oxygen metabolism and accommodation of Chamaecrista spp. under chilling stress in seedling period