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1、PlantCellRep(2015)34:1317–1330DOI10.1007/s00299-015-1789-6ORIGINALPAPERPCaP2regulatesnuclearpositioningingrowingArabidopsisthalianaroothairsbymodulating?lamentousactinorganization11111YanZhang?ErfangKang?MingYuan?YingFu?LeiZhuReceived:15February2015/Revi
2、sed:23March2015/Accepted:31March2015/Publishedonline:1May2015óSpringer-VerlagBerlinHeidelberg2015AbstractKeywordsNucleusRoothairTipgrowthActinKeymessagePCaP2playsakeyroleinmaintaining?lamentActin-bindingproteinArabidopsisthalianathenucleusatarelativ
3、ely?xeddistancefromtheapexduringroothairgrowthbymodulatingactin?laments.AbstractDuringroothairgrowth,thenucleuslocalizesataIntroductionrelatively?xeddistancefromtheapex.InArabidopsisthaliana,thepositionofthenucleusismainlydependentonRoothairsaretubularpr
4、otrusionsonrootepidermalcells.thecon?gurationofmicro?laments(?lamentousactin).TheformationofroothairsexpandstherootsurfaceareaHowever,themechanismsunderlyingtheregulationofactinandfacilitatestheuptakeofwaterandnutrientsfromthedynamicsandorganizationfornu
5、clearpositioningarelargelysurroundingenvironment(Dolanetal.1994;Ketelaarandunknown.Inthepresentstudy,wedemonstratedthatplasmaEmons2001,2009;Libaultetal.2010).Roothairsexhibit2?membrane-associatedCabindingprotein2(PCaP2)in-typicaltipgrowth,whichisregulate
6、dbyavarietyoffac-?uencesthepositionofthenucleusduringroothairgrowth.tors,includingcytoskeletonelements,vesiculartransport,AbnormalexpressionofPCaP2inpcap2andPCaP2over-andcellwallsynthesisprocesses(CarolandDolan2002;expressionplantsledtothedisorganization
7、ofactin?laments,Dietetal.2006;Ovecˇkaetal.2005;Peietal.2012).Fineratherthanmicrotubules,intheapexandsub-apicalregions?lamentousactininthesub-apicalregionofgrowingrootofroothairs,whichresultedinaberrantroothairgrowthhairslikelyplaysanimportantroleinthereg
8、ulationofrootpatternsandmisplacednuclei.AnalysesusingaPCaP2mu-hairtipgrowthbydeliveringnewmembraneandcellwalltantproteinrevealedthatactin-severingactivityisessentialmaterialtothegrowthsite(Milleretal.1999;Fanetal.forthefun
