[Objective]The study was aimed to understand the cold resistance of 7 perennial ratoon flower plants. [Method]7 perennial root flower plants in Tangshan were chose as material, the paper researched the changes of leaf morphology at different low temperature stresses, SOD activity, soluble protein content, cell membrane permeability. [Result] Percentage of electrolyte leakage of 7 kinds of ratoon flower had been changed sharply in low temperature stress and control group. Membrane permeability increased gradually with the depth of stress degree and continuous stretching of stress time, but the ranges are different from each variety. According to variation of SOD and soluble protein content, the paper explained the different cold resistance at the physiological biochemical mechanism of cold resistance aspect. The results showed that the changes of SOD and soluble protein content were consistent with growth restoration observation.[Conclusion] Based on the results of morphology and physiological biochemistry deter mination, cold resistance of 7 kinds of ratoon flowers from high to low in turn were, Dianthus plumarius, Sedum kamtschaticum Fisch, Veronica spicata'Romiley Purple', Sedum spectable 'Brilliant', Monarda 'Croftway', Rudbeckia nitida 'Herbstsonne', Hemerocallis fuava.%[目的]了解唐山地区引种的7种宿根花卉的抗寒能力.[方法]以唐山地区引种的7种宿根花卉为材料,研究不同低温胁迫条件下叶片形态及SOD活性、可溶性蛋白质含量、细胞膜透性的变化.[结果]7种(品种)宿根花卉的电解质透出率在低温胁迫下与对照相比均有明显的变化.并随胁迫程度的加深和胁迫时间的持续延长,膜透性逐渐升高,但增高的幅度各种(品种)均有所差异.以SOD的变化、可溶性蛋白质含量的变化为依据,从抗寒的生理生化机理上解释植物抗寒性的不同,结果得出SOD酶活性的变化、可溶性蛋白质含量的变化与生长恢复观测所得结果相一致.[结论]综合形态和生理生化测定结果判定,7种宿根花卉抗寒性从高到低依次为: 常夏石竹、费菜、'罗米莱紫'穗花婆婆纳、'红花'景天、'柯罗粉'美国薄荷、'革质'亮金光菊、'金娃娃'萱草.
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