水杨酸对小白菜抗铅胁迫的诱导

Induction of Salicylic Acid on Resistance to Pb Stress in Brassica rapa var. chinensis

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。

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.