Effects of Water Stress on the Protective Enzyme Activities and Lipid Peroxidation in Roots and Leaves of Summer Maize

查看全文 作　　者：GE Ti-[1]da;SUI Fang-[1]gong;BAI Li-[2]ping;LU Yin-[1]yan;ZHOU Guang-[2]sheng 机构地区：[1]Department of Agronomy, Laiyang Agricultural College, Laiyang 265200, P.R.China;[2]Laboratory of Quantitative Vegetation Ecology, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, P.R.China 出　　处：《Agricultural Sciences in China》索引2006年第5卷第4期,共8页 摘　　要：A systematic study was conducted to determine the effects of water stress on the activities of protective enzymes and lipid peroxidation in maize. The results showed that, under water stress, the activities of superoxide dismutase (SOD), catalase (CAT), and peroxidase (POD) in leaves and roots increased sharply at prophase and metaphase growth stages, such as, male tetrad stage, but then declined towards the physiological maturity. The protective enzyme activities in roots were lower than those in leaves. The content of malondialdehyde (MDA) increased according to the severity of water stress. The content of MDA in roots was lower than that in leaves. The activities of protective enzymes and lipid peroxidation in roots were positively related to that in leaves with most of the correlation coefficients being significant. The content of soluble proteins in roots and leaves decreased with increasing drought stress. The ear characteristics deteriorated and the economic yields of maize decreased significantly under water stress. The main factors that caused reduction of yields were the decrease in the number of ear kernels and 100-kernel weight. 关 键 词：玉米 水压 保护酶 脂质 过氧化反应