水杨酸对水分胁迫下草莓幼苗膜脂过氧化的影响  

The Influence of the Salicylic Acid for Membrane Lipid Peroxidation under Water Stress on Strawberry Young Plants

作　　者：刘艳[1,2] 陈贵林[1] 李晓燕[2] 刘景秀[2] 

机构地区：[1]内蒙古大学生命科学学院,内蒙古呼和浩特010021 [2]内蒙古农业大学农学院,内蒙古呼和浩特010019

出　　处：《华北农学报》2010年第5期127-131,共5页Acta Agriculturae Boreali-Sinica

基　　金：国家自然基金资助项目(30860180);内蒙古大学博士后基金资助项目(207036);内蒙古自然基金资助项目(200711020314)

摘　　要：研究水杨酸在诱导植物抗旱性形成中的作用。以草莓幼苗为试材,采用不同浓度外施水杨酸预处理,测定水分胁迫下各处理草莓叶片膜脂过氧化相关指标,保护酶类活性和光合特性。水分胁迫下,未施水杨酸的草莓叶片活性氧出现一高一低2个峰值,第1个峰值之后保护酶类活性显著提高,膜脂过氧化指标维持较低水平;随着胁迫时间延长,活性氧再次小幅积累,膜脂过氧化程度随之加剧。适宜浓度水杨酸预处理可以促进水分胁迫下活性氧的早期积累,并有效激活保护酶活性,减轻膜脂过氧化损伤,叶片维持高光合活性;但高浓度水杨酸预处理会加剧膜脂过氧化损伤。水杨酸通过促进活性氧信号泵发,活化保护酶活性,减轻膜脂过氧化损伤来提高植物对水分胁迫的抗性。Effects of salicylic acid in plant drought resistance were investigated. We take strawberry young plants as the materials and use the pretreatment of different concentrations of salicylic acid,each processing strawberry leaves were determined plasmalemma peroxide index,protective enzymes activity and photosynthetic characteristics. under water stress,the reactive oxidative species（ROS） of strawberry leaves appears two different peaks. The antioxidant enzymes obvious increase after the first peak,and the membrane lipid peroxidation maintain lower level; with the stress time prolong,ROS accumulates again,and membrane lipid peroxidation increase immediately with it. Suitable concentration salicylic acid treatments promote the ROS earlier period accumulation and effectively stimulate antioxidant enzymes activity,and alleviate membrane lipid peroxidation damage,also leaves maintain high photosynthesis activity; but high concentration salicylic acid treatments promote membrane lipid peroxidation damage. salicylic acid promote oxidative burst and activate protective enzyme activity and alleviate membrane lipid peroxidation damage to improve plant water stress resistance.

关 键 词：草莓 水杨酸 水分胁迫 膜脂过氧化 

分 类 号：S668.4[农业科学—果树学]