北京引种7种常绿阔叶植物的抗寒适应性研究

The Cold Resistance of Seven Introduced Evergreen Broad-leaved Plants in Beijing

2:007年11月到2008年3月,对引种到北京的7种常绿阔叶植物越冬期间的形态指标和生理生化指标进行分析,评价各种引种材料的抗寒性,分析各测定指标在评价中的作用。研究发现7:种植物的水分饱和亏缺值、电导率、束缚水和自由水比值、SOD活性、APX活性以及可溶性糖含量总体呈现先上升后下降的趋势,叶绿素含量的变化则相反,呈现先下降后上升的变化,可以作为评价抗寒性的生理指标;而POD活性和MDA含量变化不明显,不宜作为耐寒性评价指标。综合分析各项指标发现,7种植物的抗寒性依次为:栒子>蓝冬青、杂交油茶>金边扶芳藤、银边扶芳藤>杂交山茶、April Rose。据此提出应该使用多种生理指标并结合生长指标等综合分析的方法评价引种常绿阔叶植物的抗寒性。

The morphological,biochemical and physiological index of seven introduced evergreen broad-leaved plants in the over-wintering period in Beijing were studied from Nov.2007 to Mar.2008.The cold resistance of each introduced evergreen broad-leaved plant was evaluated,and the effect of each determination index in the evaluation was analyzed.The study showed that： the overall changes of water saturation deficit value,electrical conductivity,ration of bound water and free water,SOD activity,APX activity and soluble sugar content showed a trend of firstly rise and then decline,while chlorophyll content showed a trend of firstly decline and then rise,so they can be considered as the physiological index to evaluate cold resistance of evergreen broad-leaved plant;the changes of POD activity and MDA content were not significant,so they can hardly be the evaluation index for cold resistance of evergreen broad-leaved plant.Comprehensive analysis of each index found that the cold resistance of seven plants ordered as Cotoneaster suecicus Coral BeautyIlex meserveae Blue Princess and C.oleiferaEuonymus fortunei Emerald ＇n＇ Gold and E.fortunei Emerald GaietyC.japonica and C.japonica April Rose.Consequently we suggested that when evaluate the cold resistance of the introduced evergreen broad-leaved plant should use comprehensive analysis method that using multi-physiological index,and combined with growing index.