以黄华占种子为材料，研究盐胁迫条件下，外源亚精胺（Spd）对水稻幼苗根系的生长、抗氧化酶活性、活性氧（ROS）代谢、丙二醛（MDA）以及Na⁺稳态的影响。结果表明，经100 mmol/L NaCl溶液处理水稻幼苗根系的ROS、·O₂^-、H₂O₂、Na⁺和MDA含量显著升高，过氧化物酶（POD）和过氧化氢酶（CAT）活性显著降低；在盐胁迫条件下，施用0.1 mmol/L Spd显著提高水稻幼苗根系的CAT和POD活性，显著降低ROS、·O₂^-、H₂O₂、Na⁺和MDA含量，从而减轻Na⁺毒害和过氧化造成的膜损伤，保护生物膜系统的稳定，维持细胞的稳态。

The effects of exogenous spermidine （Spd） on rice seedling growth, antioxidant enzyme activity, reactive oxygen species （ROS） metabolism, malonic dialdehyde （MDA） and Na⁺ homeostasis were studied with rice variety Huanghuazhan as the material. The results showed that the content of ROS、·O₂^-、H₂O₂、Na⁺ and MDA were significantly increased in the root of rice seedlings by treated with 100 mmol·L^-1 NaCl, meanwhile, the activities of catalase （CAT） and peroxidase （POD） were remarkably reduced. However, the activities of CAT and POD were significantly enhanced by using 0.1 mmol·L^-1 Spd, and the content of ROS、·O₂^-、H₂O₂、Na⁺ and MDA were remarkably decreased. So, the damage of Na⁺ toxicity and membrane oxidation were alleviated, the stability of biofilm system was protected, and the steady state of cells was maintained with Spd under salt stress condition.