乌桕适应性研究 Ⅱ.耐旱生理初报

A STUDY ON ADAPTABILITY OF SAPIUM SEBIFERUM (L.) ROXB. Ⅱ. A Preliminary Report on Its Physiological Mechanism of Drought Tolerance

本实验分别对13周龄和2年龄乌桕苗在水分胁迫中的生理变化进行了研究,发现乌桕苗在水分胁迫初期SOD活性急剧增加,胁迫晚期开始下降,而正常苗没有明显变化;过氧化物同工酶和SOD同工酶谱均未发生变化;MDA含量高于正常苗;随着胁迫时间延长,游离脯氨酸累积量迅速增加,最后,其总量为胁迫初期的4～13.4倍。证实乌桕在水分胁迫逆境中具有一套功能较强的保护性生理代谢机制。

In this experiment, water stress was given to 13-week and 2-year old seedlings of Chinese Tallowtree and the physiological changes of the seedlings were investigated. The experiment results demonstrated that the activities of superoxide flismutase (SOD) in the stressed seedlings increased rapidly in the early stage of water stress experiment and decreased in the later period while the activities of SOD in the normally-grown seedlings had no obvious change, no change of SOD and peroxidase isozymes were observed during the water tress experiment, malondialdehyde (MDA) content in the stressed seedlings were higher than those in the normally-grown seedlings, and free proline content in the stressed seedlings increased abruptly and the final content was even 4~13.4 times of that in the early stage. These suggest that a protective mechanism exists in Chinese Tallowtree which can eliminate the damages caused by water stress.