La(NO_3)_3浸种对盐碱胁迫下红小豆幼苗生长和抗氧化酶活性的影响  

Effect of Seed-Soaking in La(NO_3)_3 Solution on Growth and Antioxidant Enzyme Activity of Adzuki Bean Seedlings Under Saline-Alkali Stress

作　　者：张永清[1] 刘凤兰[2] 贾蕊[2] 解晓瑜[2] 

机构地区：[1]山西师范大学城市与环境科学学院,山西临汾041004 [2]山西师范大学生命科学学院,山西临汾041004

出　　处：《生态与农村环境学报》2009年第4期12-18,共7页Journal of Ecology and Rural Environment

基　　金：国家自然科学基金面上项目(30871483);山西省自然科学基金(2006011086)

摘　　要：采用添加NaCl和Na2CO3模拟盐胁迫和碱胁迫的水培方式,研究了La(NO3)3浸种对盐胁迫和碱胁迫下红小豆幼苗生长和抗氧化酶活性的影响。结果表明:(1)与无胁迫对照组相比,盐碱胁迫明显抑制了红小豆幼苗的生长;在Na+质量浓度相同的情况下,碱胁迫对红小豆幼苗生长的影响明显大于盐胁迫;(2)使用La(NO3)3浸种可缓解盐碱胁迫带来的不良影响,使受胁迫红小豆的株高、叶面积、总根长、总根数、叶绿素、根活力、SOD活性、POD活性及CAT活性增加,并显著降低幼苗MDA含量水平,且表现出在盐碱胁迫下变化幅度高于无胁迫处理的现象;(3)在本试验条件下,30 mg.L-1La(NO3)3浸种具有显著促进红小豆根系及地上部分生长的作用。A hydroponic experiment was carried out with NaCl and Na2CO3 added to simulate saline-alkali stresses with a view to evaluating effects of seed-soaking in La（ NO3 ） 3 solution on growth and antioxidant enzyme activity of adzuki bean seedlings. Results show that （ 1 ） compared with those in the control, the adzuki bean seedlings under saline-alkali stress were short in plant height, and lower in leaf area, fresh weight of stem and leaf, root activity, and activity of superoxide dismutase （SOD）, peroxidase （POD） and catalase （CAT） as well, but higher in malondialdehyde （MDA） content in the root, demonstrating the effect of both NaCl and Na2 CO3 stresses inhibiting growth of the adzuki bean seedlings, and the effect of the latter being greater than the former; （2） seed-soaking in La（ NO3 ）3 solution enhanced growth and antioxidant enzyme activity of the adzuki bean seedling, and this effect in the treatments under saline-alkali stresses was remarkably higher than in the control, thus mitigating the detrimental effects of saline-alkali stresses ; and （ 3 ） in this experiment, soaking-seeds in 30 mg . L^-1 La（ NO3 ） 3 solution significantly stimulated growth of the shoots and roots of the adzuki bean seedlings.

关 键 词：盐碱胁迫 La(NO3)3浸种 红小豆 幼苗生长 抗氧化酶活性 

分 类 号：Q945.78[生物学—植物学] S521[农业科学—作物学]