臭氧熏气下春小麦叶片脂质过氧化作用的研究

 应用开顶式熏气装置，以低浓度(0.1ppm)的臭氧对春小麦(Triticum aestivum)进行了长时间的熏气，观测到：随着熏气时间的延长，叶片内叶绿素含量下降，丙二醛(MDA)积累增多，膜透性增大。在较高浓度(0.2ppm、0.3ppm、0.4ppm)臭氧熏气下，臭氧浓度越高，叶片内叶绿素降解越快，MDA含量越高，膜透性越大。低浓度和短时间的臭氧熏气可使超氧化物歧化酶(SOD)活性升高，而高浓度和长时间的臭氧熏气则导致SOD活性下降。试验结果表明，由臭氧熏气所引起的植物体内代谢紊乱与诸多伤害是由于脂质过氧化作用的结果。

STUDY ON LIPID PEROXIDATION IN SPRING WHEAT LEAVES WITH OZONEFUMIGATIOM

Spring wheat plants (Triticum aestivum)were fumigated with ozone of low concentration (0.1ppm) for a long period of time in open-top chamber. With the increase in fumigation time, the content of chlorophyll in leaves decreased,the formation of malondialdehyde (MDA) and electrolyeic leakage increased linearly.Plants were exposed to ozone of various concentrations (0.2ppm, 0.3ppm and 0.4ppm) for a given time. The higher the ozone concentration became, the more rapidly the content of chlorophyll in leaves declined and the formation of MDA and the electrolyic leakage rose. As fumigated with ozone of low concentration or for a short time, the activity of superoxide dismutase (SOD) in leaves tended to increase; While high ozone concentration or long fumigation time caused a decrease of SOD activity. These results suggested that the matabolic disorder and various injury in leaves induced by ozone were the result of the increase of lipid peroxidation.