摘要
利用铝在不同pH值条件下形态分布的差异,研究活性铝2种主要形态(A la、A lb)对小麦根、茎、叶中还原型谷胱甘肽(GSH)和丙二醛(MDA)含量的影响,探讨活性铝对植物的氧化胁迫及植物的抗铝机制。试验营养液中总铝浓度设置为0μmol.L-1(CK)、25μmol.L-1(T1)和75μmol.L-1(T2),各剂量组营养液的pH值分别调至4.0、4.5、5.0和5.5。研究结果表明,较低浓度的活性铝(A la和A lb)显著影响小麦根、茎、叶中GSH含量,根与叶中GSH存在一个激发、增长和消耗的过程;T2组叶中GSH含量在pH 4.5时降至最低值,同时叶中MDA存在积累,表明在此条件下,活性铝对小麦形成了最大氧化胁迫。
Variation of aluminum in form and distribution is recognized to be associated with environmental pH. Effect of activated aluminum （ Ala, Alb ） on contents of reductive glutathione （GSH） and malondialdehyde （ MDA ） in wheat was investigated by changing the pH of aluminum solutions. The experiment was designed to have three total A1 concentration treatments,0μmol · L^-1 （CK） ,25 μmol · L^-1 （T1） and 75 μmol · L^-1 （T2） ,and four pH levels,4.0,4.5,5.0 and 5.5 ,for each treatment. Results show that low concentrations of Ala and Alb significantly affected contents of GSH in the roots, stems and leaves of wheat, showing a process of inducement,increase and consumption of GSH in the roots and leaves of wheat. The GSH contents in leaves reached minimum of this experiment at pH 4.5 in treatment T2 （ 75 μmol · L^ - 1 Al ）, while MDA accumulated in the leaves, suggesting that Al reached its maximum toxicity at pH 4.5 by 75 μmol · L^- 1 in the study.
出处
《农村生态环境》
CSSCI
CSCD
北大核心
2005年第4期58-62,共5页
Rural Eco-Environment
基金
国家自然科学基金资助项目(39570150)
关键词
活性铝
小麦
谷胱甘肽
丙二醛
activated aluminum
wheat
glutathione
malondialdehyde
