| 渗透胁迫下玉米幼苗离体叶片膜透性变化机理的研究 |
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| 引用本文： | 张立军,戴俊英.渗透胁迫下玉米幼苗离体叶片膜透性变化机理的研究[J].沈阳农业大学学报,1996,27(3):207-210. |
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| 作者姓名： | 张立军 戴俊英 |
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| 作者单位： | 沈阳农业大学基础部，沈阳农业大学农学系 |
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| 基金项目： | 农业部“八五”攻关课题 |
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| 摘 要： | 在４０％（Ｗ／Ｖ）ＰＥＧ的渗透胁迫下，玉米幼苗离体叶片膜透性在丙二醛（ＭＤＡ）含量未发生变化之前显著增大。而在２０％ＰＥＧ胁迫下ＭＤＡ含量先于膜透性增大。激动素不能降低４０％ＰＥＧ处理的膜透性，但可延迟２０％ＰＥＧ处理的ＭＤＡ含量的增加和膜透性的增大。说明不同强度水分胁迫下膜透性变化的机理不同，在高强度水分胁迫下可能是膜物理结构改变的结果，而在低强度的缓慢水分胁迫下则可能是自由基积累引起膜脂过氧化作用所致。
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| 关 键 词： | 玉米 渗透胁迫 膜透性 丙二醛 |
Mechanism of Cell Permeability Changes in Detached Leaves of Maize under Osmotic Stress |
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| Zhang Lijun , Hu Wenyu ,Dai Junying.Mechanism of Cell Permeability Changes in Detached Leaves of Maize under Osmotic Stress[J].Journal of Shenyang Agricultural University,1996,27(3):207-210. |
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| Authors: | Zhang Lijun Hu Wenyu Dai Junying |
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| Abstract: | Cell permeability in detached leaves of maize seedlings under 40%(W/V) PEG6000osmotic stress increased remarkably before Malondialdehyde (MDA) content rose, However,under 20% PEG osmotic stress, the MDA content rose earilier than the cell permeability did.kinectin could not reduce the cell permeability under 40% PEG osmotic stress, but it could delay the increase of the MDA content and cell permeability under 20% PEG stress. The results showed that the mechanism of the cell permeability change was not same under different osmotic stresses.The increase of the cell permeability could result from the change of cell membrant physical structure at severe stress, and from the peroxidation of membrane lipids at mild stress. |
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| Keywords: | Maize Osmotic stress Cell permeability Malondialdehyde |
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