四种沙漠植物的抗旱研究

通过研究库布齐沙漠东段四种植物在干旱胁迫下的生理变化，结果显示，在干旱胁迫下，3种岩黄芪均分泌可溶性糖和游离脯氨酸以降低水势，增强吸水能力，同时提高SOD活性以清除O2^-，表明三者对干旱具有主动适应性；油蒿水势呈一直下降的趋势，可溶性糖也呈一直下降的趋势，游离脯氨酸和SOD活性变化不明显，处于一种“休眠”状态。根据干旱对四种植物造成的伤害程度划分抗旱性强弱顺序为：油蒿〉细枝岩黄芪〉塔落岩黄芪〉山竹岩黄芪。

Studies on Drought Resistance of Four Plants Grown in Desert

Physiological changes of four plants （ Hedysarum fruticosum vat. lignosum, H. scoparium, H. fruticosum, Artemisia ordosica）in the east part of Kubuqi Desert under drought stress were studied. Results showed that all three kinds of Hedysarum plants could produce soluble sugar and free proline to decrease leaf water potential for enhancing their water sucking ability, and at the same time to raise their SOD activity so as to erase O2^- This indicated that three Hedysarum plants could actively adapt to drought condition. However, the leaf water potential and soluble sugar of Artemisia ordosica have being decreasing straightly, changes of free proline and SOD activity were not obvious in A. ordosica, it is in a ＂dormancy＂ state. According to differrent injury degrees brought about by drought to these four plants, the order of their drought resistance strength are as follows ： Artemisia ordosica 〉 H. scoparium 〉 H. fruticosum var. lignosum 〉 H. fruticosum.