資源描述：
《水稻源庫(kù)特征和氮素積累轉(zhuǎn)運(yùn)特性對(duì)氮濃度的響應(yīng)及其與氮效率關(guān)系》由會(huì)員上傳分享，免費(fèi)在線閱讀，更多相關(guān)內(nèi)容在學(xué)術(shù)論文-天天文庫(kù)。
1、萬(wàn)方數(shù)據(jù)Abs仃actNitrogenapplicationrateinChinahasbeenincreasing，resultinginseriousenvironmentalpollutionandhighproductioncost．Therefore，reductionofNapplicationrateisnecessaryforsustainableagriculture．Achievinggreaterriceyieldsdependsmoreonincreasingnitrogenuseefficiency(Ntm)．BreedingforhighNU
2、EvarietyandoptimizingnitrogenmanagementareregardedasimportantappachestoimproveNUEandreduceenvironmentalpollution．ThepresentstudyWasconductedunderpotconditionsusingfourricegenotypeswithdifferentNUE．HighNUEphenotypesincludeShanyou63，Liangyoupeijiu，andR16．LowNUEphenotypeisR158．Thestudyaimed
3、toelucidatetheresponseofsource—sinktraits，yieldanditscomponents，nitrogenaccumulationandtranslocation，nitrogenconcentrationsofplantparts，andtoexamtheirrelationshipwithNUEforgrainyieldfNtmg)andbiomassproduction(NUEb)．ThedynamicchangesinNUEbduringvegetativegrowthstagewereexploredforfurtheru
4、nderstandingofhighNUE．Forquantificationoftheresponses，weestablishedalinearrelationshipbetweennitrogenconcentrationsandNUE．relatedtraits，whichfollowedlinearcurves，i．e．y：奴+b(ystandsforNUEorrelatedtraits，Xisnitrogenconcentration，andkistheslopeandrepresentsthedegreeofresponetonitrogenconcent
5、ration)．Themainresultsareshowedasfollows：1．PlanttissuesnitrogenconcentrationshowedverycloserelationshipswithNUE，source—sinktraits，yieldanditscomponents，nitrogenaccumulationandtranslocationcharacteristicatpanicleinitiation(PI)，heading(HD)，andmaturity(MA)，respectively．(1)Atthethreestages，n
6、itrogenconcentrationshowedsignificantlynegativecorrelationswithNUEonthebasisofgrainyield(YUE0andbiomass(NUEb)，butsignificantlypositivecorrelationswithnitrogenaccumulationandtranslocation．(2)Atthethreestages，tissuesnitrogenconcentrationshowedasignificantlypositivecorrelation、訪廿lbiomassand
7、paniclesperplant，andhadnocorrelation諏mthousandgrainweightandharvestindex．2．RicegenotypeswitlldifferentNUEhadvariationsintheresponsesofNUEtotissuesnitrogenconcentrationatPI，HDandMA。(1)Thethreehigh-NUEgenotypes(Shanyou63，LiangyoupeijiuandR16)hadmuchhigherresponses(higherslo
