水稻源库特征和氮素积累转运特性对氮浓度的响应及其与氮效率关系

《水稻源库特征和氮素积累转运特性对氮浓度的响应及其与氮效率关系》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、万方数据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、访廿lbiomassand

7、paniclesperplant，andhadnocorrelation诹mthousandgrainweightandharvestindex．2．RicegenotypeswitlldifferentNUEhadvariationsintheresponsesofNUEtotissuesnitrogenconcentrationatPI，HDandMA。(1)Thethreehigh-NUEgenotypes(Shanyou63，LiangyoupeijiuandR16)hadmuchhigherresponses(higherslo