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1、中国水稻科学(ChinJRiceSci),2017,31(4):409－416http://www.ricesci.cnDOI:10.16819/j.1001-7216.2017.6155409水稻苗期根系铵钾离子吸收的交互作用研究11,211111,*燕金香李福明褚光徐春梅陈松章秀福王丹英12*（中国水稻研究所/水稻生物学国家重点实验室，杭州311400；长江大学，湖北荆州434025；通讯联系人，E-mail：wangdanying@caas.cn）StudyontheInteractionBetweenAm
2、moniumandPotassiumAbsorptioninRiceRootsattheSeedlingStage11,211111,*YANJinxiang,LIFuming,CHUGuang,XUChunmei,CHENSong,ZHANGXiufu,WANGDanying12(ChinaNationalRiceResearchInstitute/StateKeyLaboratoryofRiceBiology,Hangzhou311400,China;ChangjiangUniversity,Jingzhou
3、434025,China;*Correspondingauthor,E-mail:wangdanying@caas.cn)++Abstract:【Objective】InordertoclarifytheinteractionbetweenNH4andKuptakeinricerootsattheseedlingstage,andtolayasolidbasisforfertilizerapplicationinriceproduction,【Method】weconductedanhydroponicexper
4、iment++++underdifferentNH4andKconcentrations，andanalyzedNH4andKuptakerateofricerootsattheseedlingstage.++【Result】WhenKconcentrationwaslessthan0.2mmol/L,theKuptakecurvethroughhigh-affinitytransportsystem++(HATS)inricerootfollowedtheMichaelich-Mentenequation.NH
5、4decreasedKuptakerate,theVmaxofKkept++decreasingwiththeincreaseofNH4concentration,however,theeffectofNH4onKmwasrelativelylittle.Compared+++withzeroNH4treatment,theVmaxandKmofKuptakeatthe1.62mmol/LNH4applicationleveldecreasedby47.30%and12.33%inricevarietyQilis
6、imiao(QL),andby39.21%and16.46%inricevarietyHuke3(HK3),respectively.When+Kconcentrationwashigherthan0.5mmol/L,itwasmainlyabsorbedthroughlow-affinitytransportsystem(LATS),in+++whichtheuptakerateofKwaskeptincreasingwiththeincreaseofKconcentration,andNH4greatlyde
7、creasedthe+++uptakerateofK-LATSatthesameconcentrationofK.TheuptakerateofNH4wasincreasedwiththeincreaseof++NH4concentration,however,nosignificantdifferencewasobservedinNH4uptakerateunderdifferentconcentrations+++++ofK.【Conclusion】NH4reducedKuptakeboththroughHA
8、TSandLATSofK;andtheeffectsofNH4on++++K-HATSuptakeweremainlyduetothecompetitionofNH4forK-carrieratthecellmembrane;Khadnoinfluenceon++NH4absorption.TheinteractionsbetweenNH4andKabsorptionin
