Na_2SO_4胁迫对四种抗盐性不同牧草膜脂过氧化和活性氧清除系统的影响  

EFECT OF Na_2SO_4 STRESS ON MEMBRANE-LIPID PEROXIDATION AND SCAVENGING SYSTEM OF ACTIVATED OXYGEN IN FOUR GRASSES WITH DIFFERENT SALT RESISTANCE

作　　者：高辉远[1] 李卫军[1] 何永革 尚新刚 

机构地区：[1]新疆八一农学院

出　　处：《植物生态学报》1995年第2期192-196,共5页Chinese Journal of Plant Ecology

基　　金：国家自然科学基金

摘　　要：经过１％和２％的Ｎａ＿２ＳＯ＿４胁迫后，草原绢蒿，圆叶蒿，苇状羊茅和鸭茅４种牧草的膜脂过氧化程度和质膜的透性都增加，但抗盐性较强的草原绢蒿和苇状羊茅的膜脂过氧化程度及质膜透性分别低于同科中抗盐性较差的圆叶蒿和鸭茅。随着Ｎａ＿２ＳＯ＿４胁迫浓度的增加，两种禾本科牧草的超氧化物歧化酶（ＳＯＤ）及过氧化氢酶（ＣＡＴ）的活性逐渐升高，两种菊科牧草的ＳＯＤ及ＣＡＴ的活性却逐渐下降，但禾本科中抗盐性较强的苇状羊茅的ＳＯＤ及ＣＡＴ活性的增长率要大于抗盐性较差的鸭茅，菊科中抗盐性较强的草原绢蒿的ＳＯＤ及ＣＡＴ活性的下降率要小于抗盐性较差的圆叶蒿。在Ｎａ＿２ＳＯ＿４胁迫下，两种抗盐性较强牧草的类胡罗卜素的相对含量要分别高于同科中抗盐性较差的牧草。Exposed to high concentrations of Na_2SO_4(1%and 2%),the permeability of plasma membrane and membrane-lipid peoxidation of Seriphidium schrenki-anum, Artemisia ratifolia,Festuca arundinacea and Dactylis glomerata were increased.But the increases in the permeability of plasma membrane and the membrane-lipid peroxidation were more prominent in salt-resistant species,Seriphidium schrenkianum and Festuca arundinacea,than the salt-sensitive spe-cies, Artemisia ratifolia and Dactylis glomerata. The activities of the supero-xide dismutase(SOD)and catalase(CAT)in the graminaceous family (F.arundinacea and D. glomerata) increased with increasing concentration of Na_2SO_4,while those in the composite family(S. schrenkianum and A. ratifo-lia) decreased.In the graminaceous family, the rate of increase of SOD and CAT activities in the salt-resistant grass(F. arundinacea)was higher than that in the salt-sensitive grass(D. glomerata),while in the composite family,the rate of decrease of SOD and CAT activities was lower in the salt-resistant grass(S.schrenkianum) than that in the salt-sensitive species(A,ratifolia).Within the same family, the relative contents of carotene in the salt-resistant grasses were higher than those in the salt-sensitive grasses.

关 键 词：牧草 活性氧 硫酸钠协迫 膜脂过氧化 

分 类 号：S540.1[农业科学—作物学]