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1、PHYSIOLOGIAPLANTARUM123:130–138.2005doi:10.1111/j.1399-3054.2005.00475.xPrintedinDenmark–allrightsreservedCopyright#PhysiologiaPlantarum2005ReviewAuxinandthedevelopingrootofArabidopsisthalianaWilliamD.Teale*,IvanA.Paponov,FranckDitengouandKlausPalmeInstitutfu¨rBiologieI
2、I&Zentrumfu¨rAngewandteBiowissenschaften,Scha¨nzlestr.1,79104Freiburg,Germany*Correspondingauthor,e-mail:william.teale@biologie.uni-freiburg.deReceived30September2004Theplanthormoneauxinhaslongbeenknowntoplayatorevealapossiblemechanismforauxinaction.Inthisarticlecrucial
3、roleinplantgrowthanddevelopment,buthowitwewillpresentanoverviewwithspecificemphasisonauxin’saffectssomanydifferentprocesseshasremainedamystery.roleinrootsofArabidopsisthaliana,focusingoncelldivision,Recentevidencefromgeneticandmolecularstudieshasbegunelongationanddiffer
4、entiation.IntroductionthatunderlietheeffectauxinhasonthedevelopingrootThesurroundingenvironmentofarootchangescontinu-sharecommonelements,andistheresignificantcross-ously.Concentrationgradientsofbothnutrientsandtoxictalkbetweenthem?Thesearequestionswhichmustbeelementsint
5、heimmediateenvironmenthaveforcedtheaddressedbydevelopmentalbiologistsifthetrueroleofdevelopmentofarangeofadaptivemechanisms(Chapinauxininrootdevelopmentistobedecipheredaccurately.1980).Forexample,thepartitioningofdrymatterbetweenAthighconcentrations,auxininhibitsrootelo
6、ngationshootandrootiscarefullyregulated,thetotalrootsurfaceandstimulatescelldifferentiation.Simultaneously,celldivi-areahasbeenincreasedbytheappearanceofroothairs,sionintherootmeristemandtheformationofadventitiousandlateralrootdevelopmentisaconsequenceoftheneedandlatera
7、lrootsarepromoted(Lincolnetal.1990).Withinforaplantbothtoexploitlocalnutrient-enrichedareasandthisevidentlycomplicatedsystem,auxinisunderstoodtotoavoidareaswithhighconcentrationsoftoxicelementsactintwoways.Auxinitselfshouldregulateitsownoverall(Chapin1980).Itisbelievedt
8、hatacommonmechanismconcentrationintheplantinordertominimizetheeffectofcouldberesponsibleforsuchenvironmentalad
