PEG-6000模拟干旱胁迫下裸果木幼苗的生理响应

采用PEG-6000不同浓度模拟干旱条件,研究裸果木幼苗的叶片相对含水量、脯氨酸含量、可溶性糖含量、丙二醛含量、超氧化物歧化酶（SOD）活性的变化。结果表明,随着PEG-6000胁迫浓度的增加,裸果木幼苗叶片的相对含水量显著下降,脯氨酸含量增加。PEG-6000浓度为10%和15%时脯氨酸显著积累,可溶性糖含量显著降低,丙二醛含量显著增加。干旱对膜系统造成了明显的损伤,但叶片能够通过增强超氧化物歧化酶（SOD）活性产生抗氧化保护,减轻过氧化伤害。即干旱胁迫对裸果木幼苗造成了明显的伤害,而其幼苗也表现出了一定的干旱适应性。

Physiological Response for PEG-6000 Simulation Naked Fruit Tree Seedlings Under Drought Stress

Using different concentrations of PEG-6000 simulated drought conditions, the changes of relative water content, praline content, soluble sugar content, MDA content and superoxide dismutase （SOD） activity in leaves on the bare fruit seedling. The result shows that the relative water content of the bare fruit seedling leaves decreased significantly, the proline content increased, the proline accumulation significant when concentration of PEG-6000 is 10% and 15%, soluble sugar content decreased significantly, the content of MDA increased significantly, the drought caused significant damage to membrane system at PEG-6000 stress concentration increases, but the leaf can through enhanced superoxide dismutase （SOD） activity to produce antioxidant protection, relieve oxidative damage. That is, the drought stress caused significant damage to the bare fruit seedlings, and the seedlings also showed a certain drought adaptability.