论文部分内容阅读
对漂浮育苗的烟草幼苗进行控水-半萎焉-复水-恢复的循环干旱锻炼。结果表明,这种干旱锻炼能显著提高烟草叶片抗氧化剂谷胱甘肽(GSH)、抗坏血酸(AsA)的含量、还原型抗氧化剂在总抗氧化剂中的比例和抗氧化酶包括超氧化物歧化酶(SOD)、抗坏血酸过氧化物酶(APX)、过氧化氢酶(CAT)、愈创木酚过氧化物酶(GPX)、谷胱甘肽还原酶(GR)的活性,降低丙二醛(MDA)的含量。当烟草植株遭受后续的干旱胁迫时,与未锻炼的对照相比,干旱锻炼过的烟草植株能保持较高的GSH和AsA含量、还原型抗氧化剂在总抗氧化剂中的比例和抗氧化酶(SOD、APX、CAT、GPX和GR)活性,以及较低的MDA含量,表明这种循环干旱锻炼提高了细胞抗氧化能力,有助于缓解烟草植株由干旱引起的氧化胁迫及其所导致的伤害,最终提高其抗旱性。这些结果表明,抗氧化系统参与了循环干旱锻炼提高烟草植株抗旱性的形成过程。
Floating nursery tobacco seedlings for water control - semi-wilting Yan - rehydration - recovery of the cyclical drought exercise. The results showed that this drought treatment significantly increased the contents of antioxidants such as glutathione (GSH) and ascorbic acid (AsA), the proportion of reduced antioxidants in total antioxidants and antioxidant enzymes including superoxide dismutase (SOD), ascorbate peroxidase (APX), catalase (CAT), guaiacolperoxidase (GPX) and glutathione reductase (GR) MDA) content. When tobacco plants were subjected to subsequent drought stress, the drought-harvested tobacco plants retained higher levels of GSH and AsA, the proportion of reduced antioxidants in total antioxidants and antioxidant enzymes ( SOD, APX, CAT, GPX and GR), and lower MDA content, indicating that this cyclic drought exercise enhanced cellular antioxidant capacity and helped to alleviate the drought-induced oxidative stress in tobacco plants and their harm , Eventually increasing their drought resistance. These results indicate that the antioxidant system is involved in cyclic drought exercise to improve the drought resistance of tobacco plants.