CO_2浓度升高对干旱胁迫下小麦光合作用和抗氧化酶活性的影响  

Effect of elevated CO_2 concentration on photosynthesis and antioxidative enzyme activities of wheat plant grown under drought condition.

作　　者：陈雄[1] 吴冬秀[1] 王根轩[1] 任红旭[2] 

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 [2]中国科学院兰州寒区旱区环境与工程研究所冰芯与寒区环境实验室,兰州730000

出　　处：《应用生态学报》2000年第6期881-884,共4页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金资助项目!(39670 1 39);中国科学院重点项目!(B类 )KZ952 S1 2 1 6)

摘　　要：在CO2 浓度分别为 35 0 μmol·mol-1和倍增浓度 (70 0 μmol·mol-1)的两个开顶式生长室内 ,研究了干旱胁迫下小麦 (TriticumaestivumL .)光合作用和抗氧化酶活性的变化 .结果表明 ,CO2 浓度升高显著提高了小麦的净光合速率 ,降低了蒸腾速率 ,提高了气孔阻力和水分利用效率 .倍增CO2 浓度明显提高了SOD、POD及CAT酶活性 ,增强了小麦的抗氧化保护能力和抗旱性 .The photosynthesis and antioxidative enzyme activities of wheat plants grown in two open top chambers with CO 2 concentrations of 350μmol·mol -1 and 700μmol·mol -1 were examined under drought stress.The result showed that elevated CO 2 concentration obviously enhanced the photosynthesis,stomatal resistance and water use efficiency,but decreased the transpiration of wheat.Doubled CO 2 concentration significantly increased the activities of CAT,POD and SOD,which enhanced the abilities of antioxidative defence and drought tolerance.

关 键 词：小麦 CO2浓度升高 干旱胁迫 抗氧化酶 光合作用 

分 类 号：Q945[生物学—植物学]