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1、JournalofSoilScienceandPlantNutrition,2011,11(4),1-14SeleniumuptakeanditsantioxidantroleinryegrasscultivarsasaffectedbyseleniteseedpelletizationP.Cartes1,2,L.Gianfreda3,C.Paredes1andM.L.Mora1,21CenterofPlant,SoilInteractionandNaturalResourcesBiotechnology,ScientificandTe
2、chnologicalBioresou-rceNucleus,UniversidaddeLaFrontera,Casilla54-D,Temuco,Chile.2DepartamentodeCienciasQuímicasyRecursosNaturales,UniversidaddeLaFrontera,Casilla54-D,Temuco,Chile.DipartimentodiScienzedelSuolo,dellaPianta,dell’AmbienteedelleProduzioniAnimali,UniversitàDeg
3、liStudidiNapoliFedericoII,Naples,Italy.*Correspondingauthor:pcartes@ufro.cl.AbstractAgreenhousestudywascarriedouttoevaluatetheeffectofseedpelletizationwithincreasingselenitedoses(from0to60gSeha-1)ontheyield,Seuptakeandthean-tioxidantresponsesofthreeryegrasscultivars(Arie
4、s,NuiandQuartet)cultivatedonanAndisolduringtwoconsecutivegrowthperiods.Inaddition,asecondassaywasconductedtodeterminetheresidualeffectofSeintheshootsduringfourconsecutiveplantcuts.Resultsshowedthatselenite-pelletedseedsatratesupto60gSeha-1didnotinfluencetheyieldofshootsa
5、ndrootsofthethreeryegrasscultivars.SeleniumconcentrationinshootsandrootssteadilyincreasedasaconsequenceofincreasedSesupply,anditwasaccumulatedmainlyintheroots.PlantsofthedifferentcultivarsaccumulatedsimilaramountsofSeintheirshoots,butQuartetrootsbuiltupgreaterSeconcentra
6、tionthanthoseofAriesorNuiatratesofapplicationabove35gSeha-1.WhereasSedosesabove10gha-1increasedtheshootSeconcentrationinthetwoyieldsofthethreeryegrasscultivarstosuitablelevelsaccordingtotheminimumdietaryrequirementofbeefanddairycattle,theresidualeffectofSewasmaintainedth
7、roughfourcutsatSesupplyof30and60gha-1.Likewise,thedifferentcultivarsdisplayeddifferentialpatternsoflipidperoxidationinresponsetotheaddedSe.Dur-ingthegrowthperiod,reductionsoftheoxidativedamageofmembraneswereac-companiedbyinhibitionofSODinAriesandNuiandbytheactivationofGS
8、H-Pxantioxidantenzymesinthethreeryegrasscultivars.Thus,inourstudythebenefitsofSeontheplanthealthwereclo
