Comparative studies on the heat resistance of 4 species of plants_ | 4种植物抗热性比较研究_

chinois. ［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。

anglais. ［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. _