为了探索玉米种子萌发期耐冷性的调控机理，以耐冷性不同的玉米杂交种郑单958、吉单415、辽单632、铁单18为试材，研究玉米种子在适温和低温萌发过程中抗氧化酶活性的变化。结果表明：SOD 酶活性呈大起大落的急剧变化，无论是适宜温度还是在低温条件下，耐冷品系郑单958和吉单415的 SOD 酶活性持续增强，且都高于冷敏感品系辽单632和铁单18；无论是低温还是适温各品系萌发期种子 POD 活性的变化都呈单峰曲线，耐冷品系郑单958和吉单415 POD 峰值出现较早且峰值较高，反之，辽单632和铁单18 POD峰值出现慢且峰值低；玉米种子 CAT 活性在种子萌发之前几乎为0，耐低温性强的品系郑单958和吉单415增加的幅度较大，而耐低温性差的品系辽单632和铁单18上升幅度较缓。
Effect of the Chilling Tolerance on Antioxidant Enzymes Activity during Maize Seed Germination
In order to explore the regulation mechanism of cold resistance at the maize seed germination stage , taking the difference maize hybrids(Zhengdan 958 ,Jidan 415 ,Tiedan 18 and Liaodan 632) as experimental ma-terials ,the changes of antioxidant enzymes activity at maize seed germination stage were studied under 10 ℃ and 27 ℃ .The results showed that the changes of antioxidant enzymes showed dramatically fluctuant trend under not only low but also suitable temperature .The activities of SOD were increased continuously since the treat -ments of chilling-resistance(Zhengdan 958 and Jidan 415) , and both higher than Liaodan 632 and Tiedan 18 . The activity of POD was decreased at first and then increased of a single peak curve ,peak appeared earlier and higher of Zhengdan 958 and Jidan 415 than Tiedan 18 and Liaodan 632 under10 ℃ and 27 ℃ .The activity of CAT was 0 before maize seed germination ,the chilling-resistance cultivars showed high increased trend than chilling-sensitive cultivars .
maizegermination stage seedlow temperature toleranceantioxidant enzymes
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