苯甲酸钠及硫代硫酸钠对郁金香切花膜脂过氧化的影响

郁金香切花在瓶插过程中，自由基清除剂苯甲酸钠（ＳＢ）处理可显著减缓蛋白质含量的下降，降低膜脂过氧化产物ＭＤＡ的积累，维持膜的完整性，减缓膜脂的饱和化趋势，对膜系统有一定保护作用，提高切花观赏品质。而自由基源硫代硫酸钠（Ｎａ＿２Ｓ＿２Ｏ＿３）则加速切花瓶插过程中蛋白质含量的下降，增加ＭＤＡ含量和膜透性的上升幅度，促使膜脂趋于饱和化，加速切花的衰老。

Effect of SB and Na2S2O3 Upon Membrane-Lipid Peroxidation in Cutting Tulips

The treatment of free radical scavenge(SB)can slovv down the decline ofsoluble proteins in cutting Tulips during the vase life ,decrease the accumulation ofMDA of the products of membrane-lipid peroxidation,protect the entirety of mem-branes ,slow down the tendency of membranelipid saturation and have some protectiveroles in membrane system thereby to improve the ornamental quality of cutting Tulips.Free radical O_2 source Na_2S_2O_3 can accelerate soluble protein contents to decline duringvase life of cutting Tulips,increase MDA contents and membrane permeation and encor-rage membrane-lipid to become saturation thereby to speed up cutting Tulips senes-cence.