水杨酸缓解白苦瓜幼苗铝毒害的生理机制研究  

Study on Physiological Mechanism of Mitigation of Salicylic Acid on Aluminum Toxicity to White Balsam Pear Seedlings

作　　者：孟长军[1] 赵银萍[1] 杜喜春[1] 谷劳亦真 MENG Chang-jun;ZHAO Yin-ping;DU Xi-chun;GU Lao-yizhen(College of Biology and Environmental Engineering,Xi＇ an University of Arts and Sciences,Xi＇ an 710065,China)

机构地区：[1]西安文理学院生物与环境工程学院,陕西西安710065

出　　处：《江西农业学报》2018年第7期38-41,共4页Acta Agriculturae Jiangxi

基　　金：西安市科技计划项目文理专项"秦岭北麓常见药食同源植物工厂化栽培基质配方研究"(CXY1352WL16)

摘　　要：为了探明外源水杨酸对白苦瓜幼苗铝害胁迫缓解的生理机制,以400 mg/L的AlCl_3胁迫为对照,设置了3个处理(T_1:400 mg/L AlCl_3+30μmol/L SA;T_2:400 mg/L AlCl_3+60μmol/L SA;T_3:400 mg/L AlCl_3+90μmol/L SA),研究了不同浓度的水杨酸处理对铝胁迫下白苦瓜幼苗生理特性和生长状况的影响。结果表明:60μmol/L SA对白苦瓜幼苗铝害胁迫的缓解效果更为明显。在该浓度处理下,铝胁迫下白苦瓜幼苗的抗氧化酶活性和根系活力均显著升高,MDA含量显著下降,白苦瓜幼苗的生物量也显著高于对照。外施适宜浓度的SA后,铝胁迫下白苦瓜幼苗的根系受到了一定的保护,膜脂过氧化作用受到抑制,光合膜的损害有所缓解,从而促进了铝胁迫下白苦瓜幼苗无机物的吸收和有机物的合成。In order to ascertain the physiological mechanism of mitigation of exogenous salicylic acid（ SA） on aluminum toxicity stress to white balsam pear seedlings,taking 400 mg/L AlCl3 stress as the control,setting up the following 3 treatments： T1,400 mg/L AlCl3＋ 30 μmol/L SA; T2,400 mg/L AlCl3＋ 60 μmol/L SA; T3,400 mg/L AlCl3＋ 90 μmol/L SA,the author studied the effects of different concentrations of SA on the physiological characteristics and growth status of white balsam pear seedlings under aluminum stress. The results showed that the mitigation effect of 60 μmol/L SA on the aluminum stress to white balsam pear seedlings was more obvious. Under the treatment with 60 μmol/L SA,both the activities of antioxidant enzymes and the root activity of white balsam pear seedlings under aluminum stress increased significantly,while the MDA content decreased significantly,and the biomass of seedlings was also significantly higher than that of the control. After applying suitable concentration of SA,the roots of white balsam pear seedlings under aluminum stress were protected,the membrane lipid peroxidation was inhibited,and the damage to photosynthetic membrane was also remitted to some extent,which promoted the absorption of inorganic substances and the synthesis of organic substances in the seedlings of white balsam pear under aluminum stress.

关 键 词：铝胁迫 白苦瓜 水杨酸 生理指标 

分 类 号：S642.5[农业科学—蔬菜学]