低温胁迫下不同光照条件对锦熟黄杨抗氧化酶活性的影响

研究了锦熟黄杨（Buxus sempervirens L.）在低温胁迫下不同光照条件（12 h光照/12 h黑暗、24 h全光、24 h全黑）对其抗氧化酶活性的影响，结果表明：低温不同光照条件下细胞膜透性和丙二醛含量均高于对照（20℃ 12 h光照/12 h黑暗），细胞膜透性和丙二醛含量在5℃ 24 h光照条件下最大；低温胁迫下SOD活性高于对照，并在5℃ 24 h光照条件下达到最高值；CAT的活性仍维持较高水平，5℃ 12 h光照/12 h黑暗显著高于对照及其它处理；在低温有光照条件下，POD活性升高，黑暗条件下POD活性低于对照。低温胁迫下POD、SOD和CAT的活性均呈上升趋势，可能是植株具有较强抗性的原因。

The Effect of Low Temperature Stress on Antioxidant Enzyme Activities of Buxus sempervirens L.Under Different Light Conditions

The effect of low temperature stress on antioxidant enzyme activity under different conditions were studied. The results showed that the relative membrane permeability and content of MDA were higher than the control. The activitie of SOD under low temperature was higher than the others and the highest level under 5℃/24 h light. The activity of CAT maintained relatively high level under low temperature and different light conditions. It was higher under 5℃12 h light/12 h dark than other groups. The activity of POD was higher under low temperature with light and was lower under dark than the control. The POD、SOD、CAT activity increased under chilling. This might be one of the reason for strong resistance to chilling in Buxus sempervirens.