盐胁迫下六种禾本科牧草幼苗叶片膜脂过氧化作用及其与耐盐性的关系

The Activities of Protective Enzymes of Grass Seedlings Subjected to Long Salinity and Their Relationship to Salinity Tolerance

对0％、0．1％、0．2％、0．3％、0．4％、0．5％6个盐浓度条件下俯仰臂形草、刚果 臂形草、网脉臂形草、杂交臂形草、黑籽雀稗、热研9号坚尼草幼苗叶片膜脂过氧化作用的影响 进行研究,结果表明,随着盐胁迫强度的增加,叶片渗透率呈直线上升;MDA含量低盐度时上 升,高盐度时下降,变化呈“∩”形;SOD和POD值变化与MDA变化相反,低盐度时下降,高 盐度时上升,呈现“∪”形,但SOD、POD值和MDA值之间呈负相关性(r1=-2．02,r2 =-2．69)。

The membrane lipid peroxidation of the leaves of Brarhiaria decumbens stapf, Brarhiaria ruziziensis Germain ＆ Evrard, Brachiaria dictyoneura stapf, Brachiaria ruziziensis Germain ＆ Evrard, Paspalum atratum cv. Reyan No.1 land Panicum maximum Jacq. Reyan No. 9 seedling to Salinity is studied. It is showed, MDA appeared in ∩-shaped and increased at low salinity and decreased at higher salinity ,SOD activity and POD activity appeared in ∪-shaped with increasing Salinity, they decreased at low Salinity and increased at higher Salinity. There was a negative correlationship between MDA and SOD and POD activity（r1=-2.02,r2=-2. 69）.