NaCl胁迫下亚精胺对番茄种子萌发及幼苗抗氧化系统的影响

采用盆栽试验，研究了NaCl胁迫下外源亚精胺（Spd）浸种处理对“白果强丰”番茄种子萌发、幼苗生长及叶片抗氧化系统的影响.结果表明：Spd浸种处理的番茄种子发芽率（G_r）、发芽指数（G_i）和活力指数（V_i）均显著增加，分别比单纯NaCl处理增加了104.90%、142.31%和122.22%，而番茄种子的平均发芽时间（MGT）缩短了4.97%;Spd浸种处理提高了NaCl胁迫下番茄幼苗叶片超氧化物歧化酶（SOD）、过氧化物酶（POD）和过氧化氢酶（CAT）活性，降低了O₂^-·产生速率和过氧化氢（H₂O₂）含量，进而降低了丙二醛（MDA）含量和质膜电解质渗漏率，增加了叶片可溶性蛋白质含量，促进了番茄幼苗生长.表明Spd浸种促进了NaCl胁迫下番茄种子的萌发及幼苗生长，增强了植株的抗盐性.

Effects of spermidine on seed germination and seedling antioxidant system of tomato under NaCl stress.

A pot experiment was conducted to study the effect of exogenous sperm idine (Spd) on the seed germination and seedling antioxidant system of tomato cu ltivar ‘Baiguoqiangfeng’ under NaCl stress. The results showed that after soak ing with Spd, the tomato seed’s germination rate (Gr), germination index (Gi), and vigor index (Vi) increased by 104.90%, 142.31% and 12222% , respectively, and the mean germination time (MGT) shortened by 497%, compare d with the control. Soaking seed with Spd increased the seedling leaf’s superox ide dismutase (SOD), peroxidase (POD) and catalase (CAT) activities and soluble protein content, and decreased its superoxide anion (O2〖SX(B-*3〗-〖〗· 〖SX)〗) production rate, hydrogen peroxide (H2O2) content, malondialdehyd e (MDA) content, and electrolyte leakage of plasma membrane. The seedling growth was also promoted. It was concluded that soaking seed with Spd could promote th e seed germination and seedling growth of tomato under NaCl stress, and enhance the salt-resistance of tomato plant.