九种景天植物在越冬期间生理生化指标的变化

Changes of Physiological and Biochemistry Chracteristics 9 Varieties of Seduam during Autumn and Winter

为了调查园林绿化植物景天的耐寒性,该试验测定了秋冬季自然降温过程中9种景天植物叶片生理生化指标的变化。结果表明:随着温度的变化,叶绿素含量变化呈现整体下降和整体先下降再上升再下降2种变化趋势。低温对9种景天的花青素和MDA含量影响都不显著。可溶性蛋白含量呈先上升再下降的变化趋势。其中石景天的脯氨酸和可溶性蛋白含量在整个试验阶段都显著高于其它景天。SOD、CAT活性整体表现出先上升后下降的趋势,其中‘胭脂红’景天与松塔景天在2个低温阶段CAT、SOD活性显著高于其它景天。而同期石景天CAT活性变化显著高于其它景天,但SOD活性变化却不显著。

To investigate the cold resistance of Seduam plants,the chlorophyll,anthocyanin、malondialdehyde（MDA）,proline（Pro）and soluble protein contents as well as superoxide dismutase（SOD）,catalase（CAT）in leaf of 9 varieties of Seduam during autumn and winter were determined.The results showed that with the drop in temperature from autumn to winter,chlorophyll contents 9 varieties of Seduam decreased all time,or decreased at first and then increased and then again decreased;but changes of the anthocyanin and malondialdehyde（MDA）contents was not significant;SOD,CAT activities first increased and then decreased.Free proline（Pro）and soluble protein contents of S.acre L.were higher significantly than others.SOD and CAT activities of S.spurium cv.Coccineum and S.sexangulare L.were higher significantly than others in all stage.At the same period,CAT activities of S.acre L.were higher significantly than others,but its SOD activity was not significantly.