Exogenous polyamines alleviate the lipid peroxidation induced by cadmium chloride stress in Malus hupehensis Rehd

摘要

In order to investigate the effects of spermidine (Spd) and spermine (Spm) on the stress of cadmium chloride (CdCl), it was checked that the content of polyamines and malondialdehyde (MDA), the rate of superoxide anion (O ) generation and the activities of superoxidase dismutase (SOD) and guaiacol peroxidase (GPX) in 1-year-old Malus hupehensis Rehd. var. pinyiensis Jiang (tea crabapple) seedlings grown in nutrient solution. The result showed that the content of free putrescine (Put) was increased, the contents of free Spd and Spm and the (Spd+Spm)/Put ratio in leaves were decreased significantly under CdCl treatment. Foliar spraying with Spd or Spm under CdCl treatment, the accumulation of free Put reduced, the contents of free Spd and Spm and the ratio of (Spd+Spm)/Put in leaves increased significantly. The activities of SOD and GPX in leaves were enhanced and O generation rate and MDA content were decreased significantly by foliar spraying with Spd or Spm under CdCl treatment. Results suggest that both Spd and Spm can alleviate the lipid peroxidation caused by CdCl in M. hupehensis var. pinyiensis.