低温胁迫对苜蓿品种幼苗SOD、POD活性和脯氨酸含量的影响

Effect of low temperature stress on SOD、POD activity and proline content of alfalfa

在4℃低温条件下,以苜蓿Medicagosativa的2个国外品种Aspire、DK141为材料,研究了苜蓿幼苗叶片内超氧化物歧化酶(SOD)、过氧化物酶(POD)活性和游离脯氨酸含量的变化。结果表明:随着低温胁迫时间的延长,2品种苜蓿幼苗叶片内SOD、POD酶活性均呈现先上升后下降的变化趋势,酶活性下降后仍能维持高于对照的活性水平;游离脯氨酸绝对含量逐渐增加。从而证明苜蓿通过维持较高水平的SOD、POD活性和提高脯氨酸绝对含量等保护机制来适应低温胁迫,减轻低温伤害,并且表明Aspire、DK141品种苜蓿抗寒性较强。

The activity of SOD、POD and Proline content of alfalfa (Aspire、DK141) during low temperature stress were studied The result showed that the activity of SOD and POD became higher at the beginning of stressing and lower later on The enzyme activity decreased,but still remained at a high level And proline content increased with the stress the result showed that alfalfa adapted to low temperature stress and reduced injury through a series of protection mechanism, including higher content of SOD 、POD and Pro And alfalfa (Aspire、DK141) has high cold resistence capacity