采用0.1 mmol/L、0.5 mmol/L和1.0 mmol/L SNP溶液处理Pb(Ac)2胁迫下亚麻幼苗，测定不同时期叶片内游离脯氨酸含量、丙二醛含量、过氧化氢酶活性、过氧化物酶活性、超氧化物歧化酶活性的变化。结果表明，NO缓解了Pb胁迫下亚麻幼苗叶片中丙二醛含量的升高，促进脯氨酸含量升高，提高了抗氧化酶的活性。且保护效应与SNP的浓度相关，0.1 mmol/L SNP处理效果显著优于1.0 mmol/L SNP处理。

The seeding of Linseed under Pb(Ac)2 stress in the concentrations of 0.1 mmol/L、 0.5 mmol/L and 1.0 mmol/L was studied through 96 h to determin the change of proline content， malondialdehyde content， the activity of superoxide dismutase， peroxidase and catalase in different treatment periods leaves of Linseed . The results indicated that the Nitric Oxide has thrown a light on the increasing of malondialdehyde content in Linseed seedling leaves compared with Pb(Ac)2 stress， the activities of antioxidant enzymes were increased， the content of praline were increase . The protective ability of concentrations of 0.1 mmol/L was significantly better than the concentrations of 1.0 mmol/L .

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