盐胁迫条件下γ-氨基丁酸对玉米幼苗SOD、POD及CAT活性的影响

THE EFFECT OF GAMMA-AMINOBUTYRIC ACID IN SUPEROXIDE DISMUTASE,PEROXIDASE AND CATALASE ACTIVITY RESPONSE TO SALT STRESS IN MAIZE SEEDLING

逆境下植物体内积累氨基丁酸(GABA)。盐胁迫严重影响玉米种子的萌发,而加入外源GABA可明显提高玉米种子的萌发率。外源GABA能迅速提高SOD、POD、和CAT这三种酶的活性。鉴于超氧化物歧化酶、过氧化氢酶和过氧化物酶是植物抗氧化保护系统中重要的组成部分,推测,盐胁迫条件下,GABA可通过提高保护酶系统活性而缓解盐胁迫对植物的伤害。

Salt stress induced Gamma-aminobutyric acid (GABA) accumulation in maize plants. The germination of maize seeds was inhibited seriously by NaCl treatment, while exoge- nous GABA reduced the inhibition of NaCl on the seeds germination. Effects on SOD, POD and CAT activity of GABA were detected. 1-2 mmol/L GABA induced the increase of the activity of SOD, POD and CAT about 20%. Because of SOD, CAT and POD are important protective en- zymes which can eliminate active oxygen, so GABA can alleviate the damage of salt stress through promoting the activity of the protective enzyme system.