摘要
Abstract
To provide insights for improving the drought resistance of Gymnocarpos przewalskii,this study investigated the effects of water stress on the antioxidative characteristics of G.przewalskii seedling roots and leaves.Using potted seedlings as materials,treatments were established as mild,moderate,and severe drought stress.The activities of ascorbate peroxidase(APX),catalase(CAT),superoxide dismutase(SOD),and peroxidase(POD),as well as the malondialdehyde(MDA)content,were measured under different water stress levels.Results showed that under water stress,the MDA content in leaves significantly increased under moderate and severe drought conditions,while the MDA content in roots increased markedly across all treatments,indicating that roots were more sensitive to water stress.SOD activity in both roots and leaves changed significantly,providing protection for the membrane system.The antioxidative role of POD was more pronounced in leaves than in roots.CAT and APX in both roots and leaves exhibited antioxidative activity,although APX activity was relatively less significant.Overall,CAT and POD were the key enzymes responsible for reactive oxygen species scavenging in leaves,while SOD played a major antioxidative role in roots,and APX activity showed little difference between the two organs.关键词
裸果木/根系/叶片/水分胁迫/抗氧化特性Key words
Gymnocarpos przewalskii Maxim./Root/Blade/Water stress/Antioxidant property分类
生物学
