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类受体激酶介导的水稻次生壁形成调控通路解析.docx

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类受体激酶介导的水稻次生壁形成调控通路解析 Title:AnalysisoftheClassIIIReceptorKinase-MediatedRegulatoryPathwayinRiceSecondaryCellWallFormation Abstract: Secondarycellwallformationinplantsisacrucialdevelopmentalprocessthatcontributestoplantgrowth,mechanicalsupport,anddefenseagainstbioticandabioticstresses.Inrice,theclassIIIreceptorkinase-mediatedregulatorypathwayhasbeenidentifiedasakeymodulatorofsecondarywallformation.Thispaperaimstoanalyzethecomponentsandmolecularmechanismsunderlyingthisregulatorypathway,highlightingitspotentialapplicationsincropimprovementforenhancedproductivityandstresstolerance. Introduction: Secondarycellwallsproviderigidityandstructuralsupporttoplantcells,especiallyinspecializedtissuessuchasxylemvessels.Theintricatenetworkofpolymerscomprisingthesecondarycellwalliscomposedofcellulose,hemicellulose,andlignin,whosebiosynthesisanddepositionaretightlyregulated.TheclassIIIreceptorkinasesplayapivotalroleinorchestratingtheseprocessesbytransmittingextracellularsignalsandactivatingdownstreammolecularcascades.Understandingtheregulatorypathwaymediatedbythesereceptorkinasesiscrucialforthemoleculardissectionofsecondarywallformationandfordevelopingstrategiesforcropimprovement. ComponentsoftheClassIIIReceptorKinase-MediatedRegulatoryPathway: 1.ReceptorKinases: TheclassIIIreceptorkinasesinvolvedinsecondarywallformationinricebelongtothesubfamilyofLeucine-RichRepeatReceptor-LikeKinases(LRR-RLK).Thesereceptorkinasesarelocalizedintheplasmamembraneandconsistofanextracellulardomain,atransmembranedomain,andanintracellularkinasedomain.Severalreceptorkinases,includingXylogenesis-I1(XyI1)andXylogenesis-I3(XyI3),havebeenidentifiedaskeyregulatorsinsecondarywallformation. 2.ExtracellularLigands: TheextracellulardomainofclassIIIreceptorkinasesbindstospecificligandsthatinitiatethesignalingcascadeforsecondarywallformation.Thepreciseidentityoftheseligandsisstilllargelyunknowninrice,butotherplantspecieshavedemonstratedtheinvolvementofvariouspolysaccharidesandglycosylphosphatidylinositol(GPI)-anchore