外源脱落酸(ABA)增强菹草抗镉(Cd^(2+))胁迫能力  

Effects of Exogenous Abscisic Acid on Tolerance of Potamogen crispus to Cd^(2+) Stress.

作　　者：张慧[1] 施国新[1] 计汪栋[1] 徐勤松[1] 袁秋红[1] 许晔[1] 

机构地区：[1]南京师范大学生命科学学院,江苏南京210097

出　　处：《生态与农村环境学报》2007年第3期77-81,共5页Journal of Ecology and Rural Environment

基　　金：国家自然科学基金(30370083);高等学校博士学科点专项科研基金资助课题(20050319005)

摘　　要：以高等沉水植物菹草(Potamogen crispus)为试验材料,观察4 mg.L-1Cd2+胁迫条件下外施脱落酸(abscisicacid,ABA)对菹草某些生理生化指标的影响。结果表明,外施ABA可以明显减轻Cd2+毒害作用,使Cd2+胁迫下菹草叶片中叶绿素、可溶性蛋白、脯氨酸含量增加,超氧化物歧化酶(SOD)、过氧化氢酶(CAT)、抗坏血酸过氧化物酶(APX)活性提高,过氧化物酶(POD)活性和O.2-产生速率降低,且以施用2.5～5μmol.L-1ABA效果最好。Effects of exogenous abscisic acid （ABA） on the activities of some enzymes, such as superoxide dismutase （ SOD）, catalase （ CAT）, ascorbate peroxidase （ APX）, peroxidase （ POD）, and some other physio-biochemical indices, such as O2^-· generation rate, chlorophyll, soluble protein and proline contents, in leaves of Potamogen crispus with or without Cd^2＋ stress were observed. Results show that Cd^2＋ , 4 mg · L^-1 in concentration, decreased activities of SOD, CAT and APX, but increased O2^-· generation rate, activities of POD and proline content, thus leading to loss of chlorophyll and soluble protein. Exogenous ABA obviously enhanced activities of SOD, CAT and APX, but inhibited O2^-· generation and activity of POD. In addition, ABA also increased the loss of chlorophyll and soluble protein triggered by Cd^2＋ stress,and proline content, thus enhancing the ability of Potamogen crispus to stand Cd^2＋ stress. The most suitable concentration of ABA is defined to be in the range of 2.5～5μmol·L^-1.

关 键 词：CD^2+ 脱落酸 菹草 

分 类 号：X1[环境科学与工程—环境科学] S5[农业科学—作物学]