不同CO_(2)浓度下渗透胁迫对小麦膜伤害的影响  

Effect of osmotic stress on wheat membrane injury under different CO_(2)concentrations

作　　者：徐仰仓[1] 王静[1] 林久生[1] 王根轩[1] 

机构地区：[1]兰州大学干旱农业生态国家重点实验室,兰州730000

出　　处：《应用生态学报》2000年第6期878-880,共3页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金(39770447);国家重点基础研究专项经费资助项目(G1999011705)

摘　　要：研究了常规CO2 (35 0 μl·L-1)和CO2 倍增 (70 0 μl·L-1)环境中生长的春小麦幼苗 ,渗透胁迫时叶片中活性氧含量的变化和质膜透性的变化 .结果表明 ,生长在CO2 倍增环境中的春小麦幼苗 ,渗透胁迫时O-2 · 及H2 O2的增长幅度均小于常规CO2 浓度下生长的春小麦幼苗 .质膜透性的增长幅度也是前者小于后者 .据此认为 ,CO2浓度倍增可以减轻渗透胁迫对质膜的氧化伤害 ,提高植物的抗旱力 .This paper studied the variation of active oxygen content and membrane permeability in leaves of spring wheat seedling exposed to osmotic stress under normal 350μl·L -1 and doubled CO 2 concentration 700μl·L -1 .The results indicate that the increasing rate of O - 2· and H 2O 2,and the membrane permeability in wheat leaves exposed to osmotic stress in normal CO 2 concentration were higher than those in doubled CO 2.Accordingly,it is suggested that doubled CO 2 can reduce the membrane oxidative injury caused by osmotic stress,and increase plant drought resistance.

关 键 词：小麦 CO_(2)浓度 渗透胁迫 活性氧 膜伤害 

分 类 号：Q945[生物学—植物学]