外源水杨酸对镉胁迫下玉米幼苗生长光合作用和活性氧代谢的缓解效应
毕业论文关键字：水杨酸；镉胁迫；玉米幼苗；光合作用；缓解效应
Mitigative Effects of Exogenous Salicylic Acid on Corn Seedlings Growth, Photosynthesis and Active Oxygen Metabolism under Cd Stress
Abstract: Using corn "Lucky 1" as the materials, hydroponic method, measured at different concentrations of cadmium stress SA maize seedlings under growth conditions and the chlorophyll content, root activity, peroxidase (POD) content, peroxide product (MDA) content, superoxide anion rate impact, a comprehensive analysis of the antioxidant capacity of corn seedling in order to lay the foundation for the establishment of a new anti-waterlogging regulation methods. The results show that compared with the control group (CK) compared with cadmium (Cd) stress inhibited the growth of maize seedlings, reducing root activity and chlorophyll content of maize seedlings, and malondialdehyde (MDA) content, peroxidase (POD) content, superoxide anion generation rate increases. Exogenous SA cadmium can relieve stress on corn seedling injury, thereby to maintain the stability of the cell membrane, reduce membrane lipid peroxidation injury, thus alleviating Cd stress on corn seedling injury and growth inhibition.
Key Words：Salicylic Acid; Cadmium Stress; Corn Seedlings; Photosynthesis; Mitigative Effect
目 录
摘要 2
Abstract 3
引言 3
1材料与方法 4
1.1实验材料 4
1.2处理方法 4
1.3测定项目与方法 5
1.4数据分析 5
2结果与分析 5
2.1外源SA对镉胁迫下玉米幼苗根长的影响 5
2.2外源SA对镉胁迫下玉米幼苗株高的影响 6
2.3外源SA对镉胁迫下玉米幼苗鲜重的影响 6
2.4外源SA对镉胁迫下玉米幼苗叶绿素含量的影响 7
2.5外源SA对镉胁迫下玉米幼苗根系活力的影响 8
2.6外源SA对镉胁迫下玉米幼苗POD活性的影响 9
2.7外源SA对镉胁迫下玉米幼苗MDA含量的影响 10
2.8外源SA对镉胁迫下玉米幼苗超氧阴离子的影响 11
3讨论 11
参考文献 13
致谢 14
外源水杨酸对镉胁迫下玉米幼苗生长、光合作用和活性氧代谢的缓解效应
引言
玉米属于乔本科（Cucurbiaceae）玉蜀黍属（Cu-mumis）一年生高大草本，全世界热带和温带地区广泛种植，为一重要谷物。道香甜，可做各式菜肴，如玉米烙，是深受大众喜爱的食品。近年来，随着我国农业经济结构的调整，其栽培面积逐步扩大，为农民增收、农业增效开辟了一条途径。但是目前由于城市生活垃圾的超标排放、农业生产中农药、化肥的不当使用和城市化、工业化的发展，致使我国可耕土地日益减少，并且土壤污染也日益严重，尤其以土壤重金属污染最为严重。镉是一种有毒性的重金属，在我国土壤镉污染较为严重,并且土壤镉污染程度也在大幅加剧。镉污染问题已成为威胁土壤生态安全和制约农业可持续发展的重要因素[1]。