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马铃薯块茎形成过程中ABA的调控作用.docx

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马铃薯块茎形成过程中ABA的调控作用 Title:TheRoleofABAintheRegulationofPotatoTuberFormation Introduction: Potato(SolanumtuberosumL.)isoneofthemostimportantstaplecropsworldwide,providingasignificantsourceofdietarycarbohydratesandnutrients.Oneoftheremarkablefeaturesofthepotatoplantistheformationofundergroundstorageorganscalledtubers.Theprocessoftuberformationiscomplexandregulatedbyseveralhormones,includingabscisicacid(ABA).ThispaperaimstoinvestigatetheroleofABAintheregulationofpotatotuberformation. RoleofABAinPotatoTuberFormation: 1.InitiationandInduction: Thetransitionfromthevegetativetothereproductivephaseisacriticalstepinthetuberizationprocess.ABAaccumulationinthestolonsduringthisstagepromotesbudinductionandtuberinitiation.ABAactsasasignalingmoleculethattriggerstheconversionofstolontipsintotuberprimordiabystimulatingtheexpressionofkeygenesinvolvedintuberdevelopment. 2.TuberGrowthandDevelopment: Duringtubergrowth,ABAplaysacrucialroleinregulatingseveralphysiologicalprocesses.ABAcontrolscelldivision,expansion,anddifferentiation,whichareessentialfortuberdevelopment.Itinfluencestheexpressionofgenesinvolvedintheformationofstarchandstorageproteinaccumulation,whichcontributetotubergrowth.ABAalsoaffectsnutrientuptakeandassimilation,ensuringtheproperallocationofresourcesfortuberenlargement. 3.DormancyControl: Oncetubershavereachedtheirmaximumsize,theyenteradormantphase.ABAregulatesdormancybyinhibitingbudsproutingandmaintainingtuberqualityduringstorage.HighABAlevelsinhibitcelldivision,metabolism,andrespiration,therebypromotingdormancy.AdecreaseinABAlevelsinducesthebreakingofdormancyandpromotessprouting. MechanismsofABAActioninTubers: 1.ABASignalingPathway: ABAexertsitseffectsbybindingtospecificreceptors,leadingtodownstreamsignalingevents.ABAreceptors,suchasPyrabactinresistance1(PYR1)/PYR1-like(PYL)/RegulatoryComponentsofAbscisicAcidReceptors(RCAR),perceiveABAandinteractwithproteinphosphatase2Cs(PP2Cs).ThisinteractioninhibitstheactivityofPP2Cs,leadingtotheactivationofSNF1-relatedproteinkinases