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1、EnvironmentalandExperimentalBotany47(2002)3950www.elsevier.com/locate/envexpbotEffectsofsaltstressongrowth,inorganicionsandprolineaccumulationinrelationtoosmoticadjustmentinfivesugarbeetcultivarsCherkiGhoulama,*,AhmedFoursya,KhalidFaresbaDe´partementdeBiologie,Faculte´desScienc
2、esetTechniques-Gueliz,BP618Marrakech,MoroccobDe´partementdeBiologie,Faculte´desSciences,Semlalia,Marrakech,MoroccoReceived1August2000;receivedinrevisedform21August2001;accepted22August2001AbstractTheeffectofsalinityonsomeagro-physiologicalparametersinplantsoffivemultigermvariet
3、iesofsugarbeethasbeeninvestigated.Plantsweresubmittedtofoursalttreatments,0,50,100and200mMNaCl,for30daysinasandcultureandthephysiologicalresponsesweremeasured.Salinityaffectedalloftheconsideredparameters.Thus,highNaClconcentrationscausedagreatreductioningrowthparameterssuchasl
4、eafarea,andfreshanddryweightofleavesandroots,buttheleafnumberwaslessaffected.ThesechangeswereassociatedwithadecreaseintherelativewatercontentandtheK+concentrations,butNa+andCl−contentswerehighlyincreasedintheleaves.Thesoluteleakageandprolinecontentwerealsoincreased,butnitrater
5、eductaseactivitywasfoundtodecreaseinleavesofallofthetestedvarieties.VarietaldifferenceswereevidentatthehighestNaClconcentrationforalmostalloftheconsideredparameters.Thesignificanceofinorganicionsandprolineaccumulationinrelationtoosmoticadjustmentwasdiscussed.Incontrasttoproline
6、,inorganicionsseemtobeinvolvedinosmoticadjustment.©2002ElsevierScienceB.V.Allrightsreserved.Keywords:Betaulgaris;Leafarea;Leafnumber;Nitratereductaseactivity;Relativewatercontent;Salinity;Soluteleakage1.Introductionmoretolerantsugarbeetvarietiesmustbeselectedandrecommendedfor
7、thesalineareas.AccurateThemainsugarbeetgrowingareasinMoroccoselectionrequiresanunderstandingofthemecha-areaffectedbysalinity(F.Mougenot,personalnismsinvolvedinsalttoleranceinthisspecies.communication).ThisproblemmaybeaseriousUndersaltstress,plantshaveevolvedcomplexhandicapfort
8、hecultivationandproductionofmechanismsallowingforadaptationto
