水杨酸对涝渍胁迫下芝麻幼苗生理特性的影响
关键词：芝麻；涝渍胁迫；水杨酸；生理特性
Effects of Exogenous Salicylic Acid on seedling physiological characteristics of alfalfas seedlings under waterlogging stress
Abstract: This experiment uses alfalfas as materials to study the effects of different concentrations (0, 0.5, 1.0, 1.5, 2.0mmol/L) of salicylic acid on alfalfas seedlings under waterlogging stress by hydroponic culture. It studies morphological index(stem height, fresh weight, dry weight and root length), the chlorophyll content, MDA content , soluble protein content, the superoxide anion production rate and the POD activity of alfalfas seedlings that have been preprocessed with Salicylic Acid under waterlogging stress to discuss the effects of Salicylic Acid on membrane permeability and protective enzyme activity, and the analyze the mechanism of action of salicylic acid in alleviating alfalfas seedling under waterlogging stress. The results showed that under waterlogging stress the plant height, dry weight, fresh weight, root length, chlorophyll content of alfalfas seedlings were decreased than those of control group, but the MDA content, free proline content，peroxide anion production rate and POD activity were increased. Appling certain concentration of salicylic acid could increase the plant height, fresh weight, dry weight, root length, chlorophyll, free proline content, peroxide anion production rate and POD activity, and could reduce the accumulation of MDA. The study implies that it could improve the activity of the antioxidant enzyme system, and reduce the hazards of peroxide anion and reactive oxygen on alfalfas seedlings and the degree of peroxidation of membrane lipids to maintain the stability of the membrane system, which alleviate the damage to alfalfas seedlings caused by the drought stress, and the effect of 1.0, 1.5mmol/L SA were optimal.
Key Words：Alfalfas; waterlogging stress; Exogenous salicylic acid; Physiological property.
目 录
摘要： 1
引言 2
1材料与方法 3
1.1实验材料 3
1.2实验设计 3
1.3测定项目与方法 3
1.4数据统计与分析 3
2结果与分析 3
2.1外源SA对涝渍胁迫下芝麻幼苗鲜重的影响 4
2.2外源SA对涝渍胁迫下芝麻幼苗干重的影响 4
2.3外源SA对涝渍胁迫下芝麻幼苗株高的影响 5
2.4外源SA对涝渍胁迫下芝麻幼苗根长的影响 5