盐碱环境胁迫对吸胀萌发期玉米种子SOD活性的影响

Effect of Saline Alkli Environmental Stresses on SOD Antioxidant Enzymes in Maize Seeds During Germination

以吸胀萌发期玉米种子为试材,使用不同浓度盐碱胁迫处理玉米种子,探究了盐碱胁迫对玉米种子萌发率和SOD抗氧化酶活性的影响。结果表明:随着盐碱浓度的增加,玉米种子的发芽率逐渐下降,低浓度时以盐离子毒害为主和高浓度时盐离子毒害和生理缺水并重;盐(NaCl)和碱(Na_(2)CO_(3))之间的诱导效应存在较大的差异。低浓度(0.03 mol/L)盐和碱的效应相近,但是高浓度(0.5 mol/L)Na_(2)CO_(3)处理对SOD的诱导效应远大于高浓度的NaCl。盐碱的浓度越大,对SOD抗氧化酶活性的诱导越大。

Maize seed which was in germination stage was selected as the experimental material,and was used to discover possible reaction mechanisms of antioxidant enzymes under salt and alkali stress.The results indicated:with the increase of saline alkali concentration,the germination rate decreased gradually.The salt ion poisoning was dominant at low concentration,while the salt ion poisoning and physiological water shortage were both serious at high concentration;salt(NaCl)and alkali(Na_(2)CO_(3))has a big difference in the induction effect.The effects of low concentration(0.03mol/L)salt and alkali are similar.The high concentration(0.5mol/L)treatment of Na_(2)CO_(3) has stronger effect on the activities of SOD antioxidant enzymes than Na^(+).The greater the concentration of saline,the greater the induction of SOD antioxidant enzyme activity.