持续低温胁迫对园林树木电导率和丙二醛含量的影响

以4种彩叶植物休眠枝为材料，测定其在-10℃低温下15天的电导率及丙二醛含量变化规律。结果表明，在整个试验期间，紫叶矮樱和元宝枫电导率升高不显著，美国红栌和鸡爪槭显著；紫叶矮樱和美国红栌丙二醛含量表现为先降低后升高的趋势，紫叶矮樱升高不显著，元宝枫和鸡爪槭表现为逐渐升高趋势，差异显著。综合比较两项生理指标可以看出，紫叶矮樱抗寒性最强，鸡爪槭最差，其它两种树种居中，不同树种在持续低温下丙二醛的变化规律表现不同。

Effects of Continuous Low-temperature Stress on Electrical Conductivity and MDA Content of Garden Trees

Under the low temperature of-10℃ for 15 days,the changes of electrical conductivity and MDA content of dormant branches were studied in four kinds of color-leafed plant.The results showed that during the experiment,the electrical conductivity of Prunus cistena and Acer truncatum increased not significantly,while that of Cotinus coggygria and Acer palmatum increased significantly.The MDA content of Prunus cistena and Cotinus coggygria showed a trend of decreasing firstly and then increasing,while that of Acer truncatum and Acer palmatum increased gradually with significant difference.The comprehensive comparison indicated that the cold resistance of Prunus cistena was the strongest,while that of Acer palmatum was the worst.The other two kinds of trees had the cold resistance in between.Different species showed different variation of MDA content under continuous low temperature.