摘要
重金属Cd作为毒性较高的环境毒物,不仅危害植物的生长和发育,也对人类健康带来严重威胁。水杨酸(salicylic acid,SA)作为一类新型植物生长调节物质,在诱导植物抗性方面起重要调节作用。以笋王一号莴苣为试验材料,研究SA处理对Cd胁迫下莴苣幼苗生长的缓解作用和生理机制。结果表明,外源SA处理可以不同程度地缓解Cd对莴苣幼苗生长的毒害效应,促进根长和叶面积的增加;增加Cd胁迫下幼苗根和叶中SOD、CAT和APX的活性,降低G-POD活性,减少MDA积累,减轻了Cd引起的氧化胁迫程度,以10μmol/L的SA处理缓解效果最好。
Cagmium （Cd） with a high toxicity in soil environment not only harms plants＇ growth and development, but also threatens human health. Salicylic acid（ a new plant growth regulator）can play an important regulative role in induction of plant Cd resistance. Sunwang 1, a lettuce variety, was tested by salicylic acids with different concentrations under different Cd stress to study the relieving effect on its growth and development and physiological mechanism. The results showed that the exogenous salicylic acid could relieve the Cd toxicity to seedling growth of lettuce in varying degrees, and lighten the oxidative stress caused by Cd stress through increasing its root length and leaf area, activity of SOD, CAT and APX in its seedling roots and leaves under Cd stress and reducing G-POD activity and MDA accumulation, and 10μmol/L salicylic acid had the best relieving effect on seedling growth of lettuce under Cd stress.
出处
《西南农业学报》
CSCD
北大核心
2009年第6期1567-1570,共4页
Southwest China Journal of Agricultural Sciences
基金
贵州省自然科学基金项目"水杨酸在植物抗重金属镉诱导中的作用及信号转导"(20072058)
贵州大学人才基金项目"水杨酸在植物抗重金属镉诱导中的作用和调控机制"(X060036)
关键词
水杨酸
镉
莴苣
缓解效应
Salicylic acid
Cadmium
Lettuce
Relieving effect
