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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 ,CO2 浓度升高可能对增强植物的抗逆能力有利
In two open top growing chambers with CO2 concentrations of 35 0 μmol mol-1 and 70 0 μmol mol-1 respectively, the effects of drought stress on Vicia faba L. Growth, photosynthesis and antioxidant enzyme activity and other physiological changes. The experimental results showed that under the doubled CO2 concentration, the plant height and the photosynthetic rate of Vicia faba increased significantly, the transpiration rate decreased, the stomatal resistance increased, and the water use efficiency could be enhanced to a great extent. Under the double CO2 concentration, The activities of CAT, SOD, GR and the content of chlorophyll, carotenoid and total soluble sugar in leaves of the plants did not change significantly compared with that under adequate water condition, and the activity of POD was even lower than that under adequate water condition. Under high CO2 / drought stress, the content of MDA in broad bean leaves was significantly lower than that under current CO2 / drought stress, indicating that high CO2 could improve the oxidative damage caused by drought stress. Therefore, an increase in CO2 concentration may be beneficial to enhancing plant resilience