CO_2浓度升高对干旱胁迫下蚕豆光合作用和抗氧化能力的影响  

Effects of Elevated CO_2 on Photosynthesis and Antioxidative Ability of Broad B ean Plants Grown under Drought Condition

作　　者：任红旭[1] 陈雄[2] 吴冬秀[3] 

机构地区：[1]中国科学院寒区旱区环境与工程研究所,甘肃兰州730000 [2]兰州大学干旱农业生态国家重点实验室,甘肃兰州730000 [3]中国科学院植物研究所,北京100093

出　　处：《作物学报》2001年第6期729-736,共8页Acta Agronomica Sinica

基　　金：国家自然科学基金资助项目 (No.396 70 139) ;中国科学院天山冰川观测试验站基金资助项目 (F2 0 0 10 4) ;中国科学院冰芯与寒区环境开放研究实验室开放基金资助项目 (BX2 0 0 1- 0 6 )。

摘　　要：在 CO2 浓度分别为当今 CO2 浓度 (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 ,研究分析了干旱胁迫下蚕豆 (Vicia faba L.)植株的生长情况、光合作用和抗氧化酶活性等生理指标的变化。实验结果表明 ,CO2 浓度倍增条件下 ,蚕豆的株高增加 ,光合速率显著提高 ,蒸腾速率降低 ,气孔阻力增大 ,水分利用效率得以较大程度地提高 ;此外 ,倍增 CO2 浓度下 ,受到干旱胁迫的植株其叶片中 CAT、SOD、GR的活性及叶绿素、类胡萝卜素、可溶性总糖的含量与水分充足条件下相比无明显变化 ,POD的活性甚至低于水分充足条件下。而高 CO2 /干旱胁迫下 ,蚕豆叶片中的MDA含量显著低于当今 CO2 /干旱胁迫下 ,表明高 CO2 对于干旱胁迫所造成的氧化损伤具有一定的改善作用。因此 ,CO2Broad bean plants ( Vicia faba L.)grown in open top chambers were us ed to assess the effects of elevated atmospheric CO 2 and drought on photosynth esi s, transpiration, water use efficiency and antioxidative enzymes of leaves. Elev a ted CO 2 (700 μmol mol -1 ) enhanced plant height, photosynthetic rate, st omatal resistance and water use efficiency, whereas decreased transpiration rate . Furthermore, under high CO 2 c on dition, there was no significant difference in the activities o f catalase (CAT), superoxide dismutase (SOD)and glutathione reductase (GR)as wel l as the contents of chlorophyll, carotenoids and soluble sugar between the wate r stressed broad bean plants and well watered plants, and the activities of pe roxidase was even weaker under water deficit condition. In addition , under high CO 2 condition, the contents of malondialdehyde (MDA)in leaves grown under th e combination of elevated CO 2 concentration and water deficit condition were significantly lower than the leaves grown under water stressed condition. This means that high CO 2 may have amelioration effect on drought induced oxidati ve damage. Namely, elevated atmospheric CO 2 can enhance the capacity of pla nts to resist stress induced oxidative damage.

关 键 词：蚕豆 倍增CO2 干旱胁迫 光合作用 抗氧化酶 二氧化碳浓度 抗氧化能力 

分 类 号：S643.601[农业科学—蔬菜学]