水杨酸对铜胁迫下水稻幼苗膜脂过氧化作用的影响

Effect of Salicylic Acid on Membrane Lipid Peroxidation in Rice Seedlings under Copper Stress

为了探讨水杨酸在缓解重金属胁迫中的作用,以水稻为材料,通过水培试验,研究了在重金属铜处理下水杨酸对水稻幼苗膜脂过氧化作用的影响。结果表明:随着铜浓度的提高,水稻幼苗叶片的膜完整性被破坏,电导率增加,最大为对照组的2.62倍,同时MDA含量显著提高,表明膜脂过氧化作用加剧。而对铜处理的水稻幼苗滴加水杨酸时,水稻叶片的电导率、MDA均比单独铜处理有所下降,说明水杨酸在一定程度上保护了膜系统的完整性,降低了水稻幼苗的膜脂过氧化作用。同时水杨酸还提高了铜处理水稻幼苗的POD、CAT和SOD的活性,强化了植物体内保护酶的功能,增强了水稻幼苗对抗重金属毒害的能力。

;In order to investigate the effect of SA in relieving heavy metal stress, the effect of salicylic acid on membrane lipid peroxidation in rice seedlings leaf under copper stress were studied by water culture experiment with rice as material. The results showed that with the elevation of Cu2＋ concentration, the membrane integrity of rice seedlings leaf was destroyed and the electric conductivity increased, the maximum was 2.62 times of the control group,meanwhile the MDA content was raised significantly, which indicated that the membrane lipid peroxidation was intensified. But when salicylic acid was drop wised during the water culture,the electric con- ductivity and MDA content were both decreased,which illustrated the salicylic acid could protect the integrity of membrane system in certain degree and release the membrane lipid peroxidation of rice seedlings leaf. At the same time, salicylic acid also increased POD, CAT and SOD activity of rice seedling leaf, enriched protective en- zyme in plant and reinforced the ability of rice seedling opposition to heavy metal poison.