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1、第26卷第2期植物研究2006年3月Vol.26No.2BULLETINOFBOTANICALRESEARCHMar.,2006盐胁迫对盐芥(Thellungiellahalophila)生长和抗氧化酶活性的影响刘爱荣张远兵陈登科(安徽科技学院生命科学院,蚌埠233100)摘要在盐芥抽苔期用不同浓度NaCl进行处理,测定单株生长量、苔茎叶和根系的质膜透性、·-MDA含量、苔茎叶的超氧阴离子(O2)含量,苔茎叶的超氧化物歧化酶(SOD)、过氧化物酶(POD)、过氧化氢酶(CAT)等的活性。结果表明:低浓度NaCl处理盐芥单株干重增加,高浓度NaCl处
2、理则降低盐芥单株的干重,鲜重有抑制作用;盐处理后盐芥地上部质膜透性逐渐增加,地·-下部质膜透性、叶片中的丙二醛(MDA)和超氧阴离子(O2)含量先降低后升高。抗氧化酶系统中的超氧化物歧化酶(SOD)活性先升高后降低,过氧化物酶(POD)、过氧化氢酶(CAT)的活性呈上升趋势。表明低浓度的盐处理对盐芥生长有利,活性氧及丙二醛(MDA)含量减少,而高浓度的盐处理后,抗氧化酶不能及时将活性氧类清除,从而导致活性氧及MDA积累,引起质膜伤害,盐芥生长量降低。关键词盐芥;抽苔期;丙二醛;质膜透性;活性氧;抗氧化酶Effectsofsaltstressonth
3、egrowthandtheantioxidantenzymeactivityofThellungiellahalophilaLIUAi2RongZHANGYuan2BingCHENDeng2Ke(SchoolofLifeScience,CollegeofScienceandTechnologofAnhui,Bengbu233100)AbstractThellungiellahalophilainitsbultingstagewastreatedwithNaClofdifferentconcentration,determiningrelevantp
4、arameters,includingthegrowthamount,theheightofsingleplant,thenumberofbranchesandleaves,themembraneleakage,theMDAcontentsofstemleavesandroots,thesuperoxide·-anion(O2)content,theactivitiesofsuperoxidedismutase(SOD),peroxidase(POD)andcalatase(CAT)ofstemleaves.TheresultshowedtheNa
5、CllowerconcentrationtreatmentbenefitedthefreshanddryweightsofT.halophila,buttheNaClhigherconcentrationtreatmentinhibitedthoseofT.halo2phila;NaCltreatmentmadethemembraneleakageofleavesincreased,thelowerconcentrationNaCltreatmentbroughtaboutthedecreaseofmembraneleakageofroots,th
6、emalondialdehyde(MDA)and·-O2contentsofleaveswhilethehigherconcentrationofthosemadethemincreasedcomparedwiththecontrolplants;thelowerconcentrationofNaCltreatmentledtotheincreaseofsuperoxidedismutaseac2tivity(SOD)comparedwiththecontrolplants,thehigherconcentrationofNaCltreatment
7、broughtabouttheSODactivitydecrease,theperoxidase(POD)andcalatase(CAT)activitiesincreasedafterNaClwastreatedwithdifferentconcentration.ItprovedthatlowerNaClconcentrationtreatmentbenefitedthegrowthofT.halophila,thereactiveoxygenspeciesandMDAcontentdecreased;andtheNaClhigherconce
8、ntrationtreatment,thesystemofscavengingreactiveoxygenspecies(
