干旱胁迫对红松幼苗保护酶活性及脂质过氧化作用的影响

随着土壤的逐渐干旱，红松（Ｐｉｎｕｓ ｋｏｒａｉｅｎｓｉｓ Ｓｉｅｂ．ｅｔ．Ｚｕｃｃ）幼苗叶中膜质过氧化产物丙二醛（ＭＤＡ）含量和膜相对透性均在干旱处理后第３天迅速上升；组织自动氧化速率先是增加，在干旱处理第３天后恢复到处理前水平。保护酶ＳＯＤ、ＰＯＤ、ＣＡＴ的活性明显提高，只有ＡＳＰ的活性下降。用ＰＥＧ模拟干旱胁迫与土壤自然干旱胁迫结果略有不同，－１．０ＭＰａ ＰＥＧ溶液对红松幼苗具有较为明显的

Effect of drought stress on activity of cell defense enzymes and lipid peroxidation in korean pine seedlings

Under the soil drought stress,content of MDA,that is the product of lipid peroxidation,and electrolyte leakage in the needles of korean pine( Pinus koraiensis Sieb.et .Zucc) seedlings increased suddenly after 3 days of drought treatment.Autoxidation rate increased in the beginning and after 3 days stress it decreased to the level of that before the stress.Activity of cell defense enzymes SOD,POD and CAT all increased markedly and ASP activity decreased.The results of PEG drought stress are different from that of soil drought stress in some way.The treatment of -1.0 MPa PEG solution had obvious drought stress effect to the seedling.But the treatment of -0.4 MPa PEG solution did no harm to the seedling,even in the beginning it can make the content of MDA decreasing significantly.This indicates that PEG solution of low concentration perhaps has some protective function for korean pine seedlings.