低温下2个寒菊品种不同开放期舌状花生理指标变化及其抗寒性差异

Effect of Low Temperature on Physiological Indexes of Ray Florets in Winter Chrysanthemum at Different Flowering Stages

以切花寒菊‘雪白’和‘雪中花’为材料,研究了低温下2个寒菊品种舌状花在不同开放期的相对电导率、MDA含量、SOD和POD活性、可溶性糖和可溶性蛋白含量的变化。结果表明:温度升-降-升过程中,两品种相对电导率、MDA含量的变化与温度变化趋势相反,SOD、POD活性、可溶性蛋白含量的变化与自然低温的变化趋势基本一致,而可溶性糖含量随温度的变化持续积累。随温度变化,‘雪中花’和初花期的相对电导率、MDA含量变化分别较‘雪白’和盛花期平稳,调节SOD活性、可溶性蛋白及可溶性糖含量的能力也分别强于‘雪白’和盛花期,表明‘雪中花’抗低温能力强于‘雪白’,而初花期强于盛花期。

The relative electric conductivity （ REC）, content of MDA, soluble sugar and protein, and SOD, POD activity of ray florets under natural low temperature were investigated in two winter cut chrysanthemum cuhivars ＇ Hanbai＇ and ＇ Xuezhonghua＇. The results showed that along with the change of natural low temperature, the changeable tendency of REC, MDA content of two cultivars was opposite to that of the low temperature, while SOD, POD and content of soluble protein were highly related to the low temperature, and the soluble sugar content accumulated all the time. The change of REC, MDA in ＇ Xuezhonghua＇ and at initial flowering stage were more smooth than those in ＇ Hanbai＇ and at full flowering stage, the ability of regulating the activity of SOD and the content of soluble sugar and protein in ＇ Xuezhonghua＇ and at initial flowering stage was also higher. It could be concluded that the chilling tolerance of ＇ Xuezhonghua＇ and at initial flowering stage was higher than that of ＇ Hanbai＇ and at full flowering stage.