【摘要】 以耐盐性番茄品种 IL7-7-5 和盐敏感性番茄品种 M82 为试材，采用盆栽试验法研究了施用不同浓度（15、25、35 mmol/L）γ- 氨基丁酸（GABA）对 200 mmol/L NaCl 胁迫下番茄幼苗农艺性状指标、光合色素积累和活性氧代谢的影响。结果显示：与对照相比，NaCl 胁迫抑制了 2 个番茄品种幼苗的生长，同时导致光合色素含量下降、活性氧积累量增加、抗氧化酶活性降低；施加外源GABA 处理缓解了 NaCl 胁迫对 2 个番茄品种幼苗生长的抑制作用，提高了植株的株高、茎粗、干重、鲜重等，使番茄幼苗仍保持较高的光合色素含量，增加了番茄幼苗叶片中抗氧化酶（CAT、SOD、POD）的活性，降低了 MDA 含量、O₂^-产生速率和 H₂O₂含量。M82在 15 和 35 mmol/L GABA 浓度处理下缓解盐胁迫的效果较好；IL7-7-5 在 25 和 35 mmol/L GABA 浓度处理下缓解盐胁迫的效果较好。更多还原

【Abstract】 The salt-tolerant tomato variety IL 7-7-5 and salt-sensitive tomato variety M82 were used as test materials,and the potting methods were used to study different concentrations （15, 25 and 35 mmol/L） of γ-aminobutyric acid （GABA）on agronomic traits, photosynthetic pigment accumulation and active oxygen metabolism of tomato seedlings under 200 mmol/L NaCl stress. The results showed that compared with the control, NaCl stress inhibited the growth of the seedlings of the two tomato varieties, and led to a decrease in photosynthetic pigment content, an increase in the accumulation of active oxygen, and a decrease in the activity of antioxidant enzymes. The application of exogenous GABA treatment alleviated the inhibition of NaCl stress on the growth of the seedlings of the two tomato varieties, reduced the damage to the plants and leaves, and increased the plant height, stem thickness, dry weight, fresh weight, etc, so that the tomato seedlings remained unchanged. Maintaining a high photosynthetic pigment content increased the antioxidant enzyme CAT, SOD and POD activities in tomato seedling leaves, and reduced the MDA content, O₂^- production rate and H₂O₂ content. M82 had the best effect on alleviating salt stress at 15 and 35mmol/L GABA concentrations, and IL 7-7-5 had the best effect on alleviating salt stress at 25 and 35 mmol/L GABA.更多还原