4种植物抗热性比较研究

目的]探讨植物对高温的适应性机制。方法]分别以八仙花、八角金盘、北海道黄杨和熊掌木的1年生扦插苗为试验材料,将其置于光照培养箱中进行培养,以25℃处理为对照,研究不同培养温度（30、35、40℃）下4种植物叶片丙二醛和可溶性蛋白含量、相对含水量、电导率等的变化情况。结果]随温度升高,4种植物叶片总含水量下降,电导率及丙二醛、可溶性蛋白含量上升,其中含水量下降幅度依次为：熊掌木〉北海道黄杨〉八仙花〉八角金盘,电导率上升幅度依次为：北海道黄杨〉熊掌木〉八角金盘〉八仙花,可溶性蛋白积累量依次为：八仙花〉八角金盘〉北海道黄杨〉熊掌木。结论]八仙花和八角金盘的抗热性较强,北海道黄杨和熊掌木的抗热性较弱。

Comparative Studies on the Heat Resistance of 4 Species of Plants

Objective] The purpose of the study was to discuss the adaptability mechanism of plant to high temperature.Method] The 1-year old cutting seedlings of Hydrangea macrophylla,Fatsia japonica,Euonymus japonicus and Fatshedera lizei were used as tested materials resp.With treatment at 25 ℃ as CK,they were cultivated in irradiant incubator for studying the changes of malonaldehyde(MDA) content,soluble protein content,relative water content and conductivity in the leaves of 4 plants under different cultivation temperatures of 30,35 and 40 ℃ resp.Result] As the temperature was increasing,the total water contents in the leaves of 4 plants were decreased and their conductivities,MDA contents and soluble protein contents were increased.The decreasing extents of their water contents were: F.lizei>E.japonicus>H.macrophylla>F.japonica,the increasing extents of their conductivities were: E.japonicus>F.lizei>F.japonica>H.macrophylla,the accumulation amounts of soluble protein were: H.macrophylla>F.japonica>E.japonicus>F.lizei.Conclusion] The heat resistance of H.macrophylla and F.japonica was stronger and that of Hokkaido boxwood and F.lizei was weaker.