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。

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 .

Q945.78