不同盐胁迫对波斯菊种子萌发与幼苗生长的影响.docx

ZHOUMeng-na,WANGLu,GUOJing,etal.DifferentSaltStressonSeedGerminationandSeedlingGrowthofCosmosbipinnatus［J］.UrbanEnvironmentUrbanEcology,2015，28（1）:1-4.不同盐胁迫对波斯菊种子萌发与幼苗生长的影响周梦娜，王露，郭敬，邓贤，施卫省*（昆明理工大学现代农业工程学院，昆明650500）摘要：利用波斯菊为试验材料，研究不同盐分浓度对种子萌发胁迫作用，探讨NaCl、Na2SO4和NaHCO3对波斯菊种子萌发与幼苗生长特性的影响。结果表明，Na2SO4对波斯菊种子的萌发具有低促高抑效应；当盐溶液浓度低于0.05%时，NaHCO3对种子的发芽无明显影响；NaCl对种子的发芽有明显影响。但随着浓度的升高，所表现的抑制作用为NaHCO3NaClNa2SO4。波斯菊种子萌发时对NaCl、Na2SO4和NaHCO3的耐盐适宜浓度分别为0.067%、0.104%、0.052%；耐盐半致死浓度为0.209%、0.302%、0.181%；耐盐极限0.438%、0.619%、0.388%，即表明波斯菊种子对Na2SO4耐受能力最高，NaHCO3对种子发芽的胁迫力最大。波斯菊幼苗对3种盐溶液胁迫较为敏感，无论Na+浓度高低，均对出苗率、幼苗的株高及根长有不同程度的抑制作用，其中高浓度的NaHCO3抑制尤为明显，作物出现不生长趋势。关键词：波斯菊；盐胁迫；种子萌发；幼苗生长中图分类号：X503.233文献标识码：A文章编号：150088（原1002-1264）（2015）01-0001-04DifferentSaltStressonSeedGerminationandSeedlingGrowthofCosmosbipinnatusZHOUMeng-na,WANGLu,GUOJing,DENGXian,SHIWei-sheng*（FacultyofModernAgriculturalEngineering,KunmingUniversityofScienceandTechnology,Kunming650500,China）Abstract:Inthispaper,theCosmosbipinnatuswasusedtotestthestressofdifferentsaltconcentrationsonseedgerminationandexploretheinfluenceofNaCl,Na2SO4andNaHCO3ongerminationandseedlinggrowthcharacteristicsofCosmos.TheresultsshowedthatNa2SO4hadalowpromotionbuthighinhibitoryeffectonCosmosseedgermination.Whenthesaltconcentrationwaslowerthan0.05%,theeffectofNaHCO3onseedgerminationhadnoobviousdifferencecomparedwiththecontrolgroup,butNaClproducedasignificantdifference.Withtheincreaseofthesaltconcentrations,theinhibitionofperformancewasasfollows:NaHCO3NaClNa2SO4.InNaCl,Na2SO4andNaHCO3treatments,thesalt-tolerantsuitableconcentrationofCosmosseedgerminationwas0.067%,0.104%and0.052%,respectively;thesalttolerancemedianlethalconcentrationwas0.209%,0.302%and0.181%,respectively;andsalttolerancelimitwas0.438%,0.619%and0.388%,respectively,indicatingthattheCosmosseedshadthehighesttolerancetosaltsolutionofNa2SO4;andNaHCO3producedthemaximumstresstoseedgermination.Cosmosseedlingsweremoresensitivetoallthethreekindsofsaltsolutionstress.RegardlessofthelevelofNa+concentration,thegerm