8826773_颜培涵_水杨酸对NaCl胁迫下百日草幼苗生长的影响_颜培涵水杨酸对NaCl胁迫下百日草幼苗生长的影响.docx

I15水杨酸对NaCl胁迫下百日草幼苗生长的影响颜培涵目录摘要IAbstractII前言11.材料与方法21.1试验材料21.2试验方法21.3项目测定21.4数据分析32.结果与分析32.1不同浓度SA对NaCl胁迫下百日草幼苗株高的影响32.2不同浓度SA对NaCl胁迫下百日草幼苗鲜重、干重的影响42.3不同浓度SA对NaCl胁迫下百日草幼苗根系形态的影响52.4不同浓度SA对NaCl胁迫下百日草幼苗不同径级根系参数的影响73.结论与讨论83.1结论83.2讨论8参考文献11致谢13摘要为探讨外源水杨酸（SA）对NaCl胁迫下百日草幼苗生长的影响以梦境百日草为试验材料采用温室盆栽试验的方法在100mmol/LNaCl胁迫处理下研究不同浓度（0mmol/L、0.5mmol/L、1.0mmol/L和1.5mmol/L）SA对NaCl胁迫下百日草幼苗生长的影响。结果表明：NaCl胁迫下百日草幼苗的株高、鲜重、干重、根系总根长及细根（0-0.3mm）根长均不同程度的降低外施SA后各项指标均随SA浓度的增加呈现出先上升后下降的趋势。其中0.5mmol/LSA处理的各项指标均达到最大值且显著高于对照；而1.0mmol/LSA处理与对照相比差异不显著；1.5mmol/LSA处理后各项指标均显著低于对照。综合来看外施0.5mmol/LSA时百日草幼苗生长最好可有效缓解百日草的NaCl胁迫。关键词：百日草；水杨酸；NaCl；生长AbstractInordertoexploretheeffectofexogenoussalicylicacid(SA)ongrowthofZinniaelegansunderNaClstressdreamlandZinniaeleganswasusedastheexperimentalmaterialandgreenhousepottedexperimentwasconducted.Under100mmol/LNaClstresstheeffectsofdifferentconcentrationsofSA(0mmol/L0.5mmol/L1.0mmol/Land1.5mmol/L)onthegrowthofZinniaelegansunderNaClstresswerestudied.TheresultsshowedthatunderNaClstresstheplantheightfreshweightdryweighttotalrootlengthandfineroot(0-0.3mm)lengthofZinniaelegansseedlingsalldecreasedtodifferentdegrees.AllindexesshowedatendencyofincreasingfirstandthendecreasingwithSAlevelrisingafterexternalapplicationofSA.AllindexesreachedthemaximumvaluewhentheconcentrationofSAwas0.5mmol/Lwhichwassignificantlyhigherthanthecontrolgroup.WhentheconcentrationofSAwas1.0mmol/Lthedifferencewasnotsignificant.WhentheconcentrationofSAwas1.5mmol/Ltheseindexesweresignificantlylowerthanthecontrolgroup.InsummaryZinniaelegansseedlingsgrewbestunderexternalapplicationof0.5mmol/LSAso0.5mmol/LSAcouldalleviateNaClstressofZinniaeleganseffectively.Keywords:Zinniaelegans;Salicylicacid;NaCl;Growth水杨酸对NaCl胁迫下百日草幼苗生长的影响前言土壤盐渍化是制约植物生长发育的重要逆境因素之一[1]。我国是土壤盐渍化比较严重的国家盐渍化土壤分布广面积大严重的威胁