Abstract: The growth of pakchoi was significantly inhibited under the condition of 0.3 mmol/L Pb stress. The treatment 0.1 mmol/L salicylic acid (SA) could significantly alleviated the growth toxicity of pakchoi seedling under the 0.3 mmol/L Pb stress. The effect of SA treatment on the growth of pakchoi under Pb stress showed the ‘low to promote and high to suppress’. The treatment 1.5 mmol/L SA did not alleviate the toxicity but increased toxicity. This may be related to the compound injury formation of high concentrations of SA and Pb.

Key words: salicylic acid, lead (Pb) stress, pakchoi, growth

摘要： 0.3 mmol/L铅胁迫下小白菜（Brassica rapa var. chinensis）生长受到显著抑制，0.1 mmol/L水杨酸（salicylic acid）诱导处理能显著缓解0.3 mmol/L铅胁迫对小白菜幼苗生长的抑制；并且水杨酸对铅胁迫下小白菜的生长存在“低促高抑”效应，当水杨酸处理浓度达到1.5 mmol/L时，不但不能缓解铅对小白菜的毒害，反而加重毒害，这可能与高浓度水杨酸与铅形成的复合伤害有关。

关键词: 水杨酸, 铅胁迫, 小白菜, 生长