草业学报2012，Vol.21Issue(3)：171-176,6.
外源水杨酸对苜蓿幼苗盐胁迫的缓解效应
Exogenous salicylic acid on alleviating salt stress in alfalfa seedlings
摘要
Abstract
In order to make clear the physiological and biochemical mechanisms of exogenous salicylic acid (SA) on salt resistant capability of alfalfa, Medicago sativa cv. Gannong No. 3 was used as material to study the effect of exogenous SA on alfalfa seedling growth, organic osmotic regulation substance contents and anti-oxidization system on condition of 150 mmol/L NaCl stress using foliar application. The result indicated that 150 mmol/L NaCl salt stress had conspicuous inhibitory effect on alfalfa seedling growth, while significant increase in shoot heigth, root length, fresh weight and plant chlorophyll content were found when 0. 25 mmol/L exogenous SA had been applicated, together with significant decrease in free proline and malondialdehyde (MDA) contents in leaves and rootsand increase in soluble protein; superoxide dismutase (SOD), guaiacol peroxidase (GPX) and ascorbate peroxidase (APX) activities in leaves were found significantly increased, and no change was found in catalase (CAT), ascorbic acid (AsA) and reduced ghrtathione (GSH); for the root, GPX activity, AsA and GSH contents were found increased, and no change was found in SOD, CAT and APX activities, indicating that exogenous SA could regulate organic osmotic regulation substances and protect the anti-oxidization system in alfalfa seedling, and alleviate the injure of salt stress on alfalfa plants.关键词
苜蓿/盐胁迫/水杨酸Key words
alfalfa/ salt stress/ salicylic acid分类
农业科技引用本文复制引用
周万海,师尚礼,寇江涛..外源水杨酸对苜蓿幼苗盐胁迫的缓解效应[J].草业学报,2012,21(3):171-176,6.基金项目
牧草种质资源保护利用(NB2130135)和国家牧草产业技术体系专项(CARS-35)资助. （NB2130135）
