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1、中国水稻科学(ChinJRiceSci),２０１５,２９(３):２５９－２７２http://www．ricesci．cnDOI:１０．３９６９/ji．ssn．１００１Ｇ７２１６．２０１５．０３．００５２５９孕穗期冷水灌溉对寒地粳稻籽粒灌浆及其氮素积累的影响贾琰沈阳邹德堂沙汉景王敬国刘化龙赵振东夏楠赵宏伟∗(东北农业大学水稻研究所,哈尔滨１５００３０;∗通讯联系人,EＧmail:hongweizhao＠１６３．com)EffectofColdＧWaterIrrigationatBootingStageonGrainFillingandNitrogenAccumulati
2、onofRiceinColdＧRegionJIAYan,SHENYang,ZOUDeＧtang,SHAHanＧjing,WANGJingＧguo,LIUHuaＧlong,ZHAOZhenＧdong,XIANan,ZHAOHongＧwei∗(RiceResearchInstitute,NortheastAgriculturalUniversity,Harbin１５００３０,China;∗Correspondingauthor,EＧmail:hongweizhao＠１６３c．om)JIAYan,SHENYang,ZOUDetang,etal．EffectofcoldＧwa
3、terirrigationatbootingstageongrainfillingandnitrogenaccumulationofriceincoldＧregion．ChinJRiceSci,２０１５,２９(３):２５９Ｇ２７２．Abstract:InordertounderstandhowcoldＧwaterirrigationatbootingstageaffectsthedrymatterandnitrogenaccumulationofgraininriceincoldＧregion,twojaponicarice(Dongnong４２８andSongjin
4、g１０)weresubjectedtocoldwaterirrigationfor６varyinglengthoftime(０,３,６,９,１２and１５d)atbootingstage．Thedrymatter,nitrogenaccumulationandenzymeactivitiesinvolvedinnitrogenmetabolismofgrainweremeasured,respectively．TheresultsshowedthatgraindrymatteraccumulationandyieldinriceincoldＧregionfollowe
5、dasimilartrend,anddecreasedundercoldＧwaterirrigationatbootingstagewithincreasingcoldＧwaterirrigationdayscomparedwiththecontrol．Duetothedecreasedmaximumaccumulationrate,seedsettingrate,productivepaniclenumber,grainnumberperpanicle,graindrymatteraccumulationdecreased．Thetotalnitrogen,prot
6、einnitrogenofgrain,proteincontentofmaturegrain,andglutaminesynthetaseactivityatearlygrainfillingstageincreasedundercoldＧwaterirrigation．ThegutamicＧpyruvictransaminaseandglutamicＧoxaloacetictransaminaseactivitiesingrainsignificantlyincreasedunder６dofcoldＧwaterirrigation,whereassignifican
7、tlydecreasedunder９Ｇ１５dofcoldＧwaterirrigation．Theincreaseintotalandproteinnitrogencontentswasduetotheenhancementofgrainnitrogenassimilationandproteinsynthesisabilityundershortterm(３－６d)coldＧwaterirrigation,however,theprocessofnitrogenassimilationwasinhibited,affectingthesynthesi
