外源抗坏血酸对盐胁迫下大麦幼苗生长及生理指标的影响
毕业论文关键字：抗坏血酸；盐胁迫；大麦幼苗；缓解效应
Effects of exogenous ascorbic acid on the growth and physiological indexes of barley seedlings
Abstract: Through the experiments of hydroponics culture of barley and using barley seedlings as materials, effects of the different concentration ascorbic acid (0、 2、 2.5、 3、 3.5、 4 g•L-1 ) on the growth and physiological indicators of barley seedling under salt stress. In order to reveal the physiological mechanism of ASA enhanced the salt tolerance of barley, and to provide a theoretical basis for the research of barley germplasm resources and the establishment of high yield and high quality of barley in saline soil.The results showed that under salt stress, the contents of barley seedling height, root length, fresh weight, chlorophyll content and root activity decreased significantly.The superoxide anion production rate, POD activity, MDA content were significantly increased .Exogenous ASA application on the leaves increased the chlorophyll content, POD activity and root activity.The content of MDA and superoxide anion production rate were decreased.The results showed that exogenous ASA could effectively keep cytomembrane stabilization and reduce the damage from membrane lipid peroxidation,by which could mitigate the harmful effects from salt stress on plants,and the effect of 3g•L-1 ASA was optimal.
Key Word:Ascorbic acid;Salt Stress; Rape Seedling; Mitigative effect
目 录
摘 要 1
Abstract 1
引 言 2
1. 材料与方法 3
1.1 实验材料 3
1.2 处理方法 3
1.3测定项目与方法 3
1.4 数据分析 3
2. 结果与分析 3
2.1 ASA喷施对盐胁迫下大麦幼苗部分生长指标的影响 4
2.2 ASA喷施对盐胁迫下大麦幼苗光合色素影响 4
2.3 ASA喷施对盐胁迫下大麦幼苗根系活力的影响 5
2.4 ASA喷施对盐胁迫下大麦幼苗POD活性的影响 5
2.5 ASA喷施对盐胁迫下大麦幼苗MDA含量的影响 6
2.6 ASA喷施对盐胁迫下大麦幼苗超氧阴离子产生速率的影响 6
3. 讨论 7
4. 结论 8
参考文献 9
致谢 12
外源抗坏血酸对盐胁迫下大麦幼苗生长及生理指标的影响
引言
大麦属于禾本科的植物，主要用作粮食、饲料、啤酒、工业原料以及医药工业原料和保健食品，是世界上栽培历史最悠久的作物之一，已经有几千年的种植历史[1]。世界谷类作物中，大麦种植总面积和总产量仅次于小麦、水稻、玉米、而居第四位[2]。中国的大麦现多产于淮河流域等以北地区，具有生理周期短，早熟、高产、适应能力强等特点，是禾本科中比较耐盐的作物[3]。
上一篇：酵母Tsa2p蛋白的纯化
下一篇：杏鲍菇不同培养方式的比较研究