摘要
随着土壤的逐渐干旱，红松（ＰｉｎｕｓｋｏｒａｉｅｎｓｉｓＳｉｅｂ．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干旱胁迫效应，而－ ０．４ＭＰａ ＰＥＧ 不仅对红松幼苗无明显伤害，在处理初期还使ＭＤＡ 含量明显减少，表明低浓度ＰＥＧ 可能对红松幼苗具有一定的保护作用。
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.
出处
《生态学报》
CAS
CSCD
北大核心
1999年第6期850-854,共5页
Acta Ecologica Sinica
基金
黑龙江省杰出青年基金
关键词
红松
幼苗
干旱胁迫
保护酶
丙二醛
脂质过氧化
drought stress
Pinus koraiensis
cell defense enzyme
MDA
electrolyte leakage
autoxidation rate
