J Integr Plant Biol. ›› 1997, Vol. 39 ›› Issue (12): -.

• Research Articles •    

Generation of Active Oxygen Free Radicals and Its Injury to Microsome Membranes in Wheat Leaves Under Drought Stress

Zeng Fu-li, Zhang Ming-feng and Li Yu-feng   

Abstract: The microsome membrane of wheat ( Triticum aestivum L. ) leaves under different time of drought stress was purified to determine the active oxygen free radicals generated and their severity of injury to the membrane. During the drought stress the rate of O2- and H2O2 generation increased for a certain time and then decreased. The concentration of MDA increased continuously. The activity of SOD decreased gradually. The concentration of —SH group and MDA increased from the beginning until the 36th hour under drought stress, thereafter MDA content continued to increase while the —SH content decreased. Several physiological indexes related to membrane injury, such as root electroconductivity, leaf water potential and water content were all affected accordingly.

Key words: Active oxygen free radical, Microsome membrane, Drought stress, Activity of SOD, Wheat

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