27539.虉草耐鹽性及其生理機理研究

1、內蒙古民族大學碩士學位論文虉草耐鹽性及其生理機理研究姓名：聶微微申請學位級別：碩士專業(yè)：草業(yè)科學指導教師：張永亮20100401StudiesonSaltToleranceandPhysiologicalMechanismofReedcanarygrassAbstractTo，discussthesalttoleranceandphysiologicalcharacteristicsmachanismofreedcanarygrass，

2、thesalinealkalistressofdifferentconcentrationontheseedandseedlingof咖speciesreedcanarygrass(newstrainandChuancaoNo3)werestudiedinthispaperNaCl、Na2S04、NaHC03andNa2C03mixedtogetherwithdifferentsubstanceratiowereused，whichwe

3、re1：1：0：0(groupA)、9：I：I：I(groupB)、1：1：9：1(groupC)and1：1：1：9(groupD)ThemainresultsWere懿向llowed(1)haneutralsaltstressof25mmol／Lmixedalkalisalinesolutionconcen仃ation，meseedgerminationrate，germinationtendencyandgerminationin

4、dexoftWO刪canarygrasswerehigherthancontr01ThisshowedthatlowsaltystresscouldpromotetheseedgerminationWhensaltconcentrationwashigherthan50mmol／Ltheseedgermmatmnrateandgerminationtendencydecreasedwiththeincreaseofsalinealkal

5、iconcentration(2)Inneutralsaltstressoflowalkali—salineconcentration，theabovegroundbiomaSsoftWeedcanarygrasswassli曲tlyhigherthancontr01Thisshowedthatneutralsaltstressoflowalkali。salineconcentrationhadsomepromotioneffecton

6、abovegroundgrowthofthereedcanary羅assseedlingWhensaltconcentrationWashigherthan50mmol／L，theplantheightandabovegroundbiomassbothhadadecreasedtendencywiththeinc玎easeofsalinealkaliconcen奸ation(3)Withthestrengthincreaseofthes

7、altstress，Nacontentinleaf柏d啪toftweedcanarygrassWassignificantlyraised，whereasthechangeofKcontentWasdi繯：rentK。contentinleafandrootofnewstrainWasrisefirstthenf砒l，arldtllatofCh啪caoNo3showeddeclinedtrendAttheSalTleconcentrat

8、ionofmixedalkalisalinesolution，thestrengthincreaseofNaofnewstrainwasobviouslylowernl鋤tlatofChuancaoNo3，whileKcontentandthevalueofK／Naofnewstrainweresignificanflvhighel“thanthatofChuancaoNo3Thisindicatedthatnewstrainhadst