简介：~~

简介：~~

简介：~~

简介：为了推进，改进高地大米变化Huhan3和Huhan7，种子样品为约1和5d与二艘可重获的飞船被送到外层空间并且分别地为7和5代被宣传。Phenotypic分析表明词法特点和蛋白质和谷物的直链淀粉内容变化了。由联系基因的简单顺序重复(SSR)和插入删除(InDel)的genomic变化的描述标记显示变化模式是很复杂的。大多数变化在简单顺序重复碎片发生在碎片的3结束或5结束。反向的抄写聚合酶链反应(RT-PCR)试金证明在SSR的那些部分的变化影响了他们的基因表示，显示那基因联系了标记将有用孤立功能的基因。为繁殖的地调查也表明有高产量，高质量和干旱忍耐的更多的线能通过太空繁殖被选择。结果显示太空mutagenesis为米饭繁殖导致了分子的变化，以及生理、词法的变化。

简介：Themajorstoragesubstanceinriceendospermisstarch,whichaccountsfor80%ofdrymatterweight.Inthisstudy,ricemutantflo7,selectedfromtheprogenyofNipponbare’stissueculture,displayedflouryandopaqueendosperm.Comparedwithitscorrespondingwildtype(WT)Nipponbare,themutantflo7producedlonger,narrower,thinnerandlightergrains.Thelevelsofglucose,fructoseandsucroseinthemutantflo7endospermwerehigherthanthoseintheWTendosperm,whereastheproteincontentwasnotaffected.Withrespecttobothamylosecontentandgelconsistency,themutantflo7waslowerthanWT,butitsalkalivaluewashigher.Scanningelectronmicroscopicexaminationsshowedthattheendospermofthemutantflo7containedirregular,looselypackedandcompoundstarchgranules.Geneticanalysisindicatedthatthemutantphenotypewasdeterminedbyasinglerecessivenucleargene.Theflo7locuswasmappedtoaregiononthelongarmofchromosome12,withina95.1kbintervaldefinedbythemarkersC2-11andC5-15.Thereare13openreadingframesinthemappinginterval.Transcriptionprofilingofthedevelopinggrainsshowedthatanumberofgenesinvolvedinstarchsynthesiswereaffecteddifferentlyinthemutantflo7.

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简介：Nitrogen(N)useefficiencyisusuallylessthan50%,anditremainsamajorprobleminricecultivation.Controlledreleasefertilizer(CRF)technologyisoneofthewell-knowneffortstoovercomethisproblem.TheefficiencyofCRF,however,isverymuchdependentonthetimingofnutrientrelease.ThisstudywasconductedtodeterminetheprecisetimeofNuptakebyriceasaguidelinetodevelopefficientCRF.FertilizerNuptakebyriceatdifferentgrowthstageswasinvestigatedbyusing15Nisotopictechnique.Ricewasplantedinpots,with15NureaasNsourceattherateof120kg/hm2.Potassiumandphosphoruswereappliedatthesamerateof50kg/hm2.Standardagronomicpracticeswereemployedthroughoutthegrowingperiods.Riceplantswereharvestedeverytwoweeksuntilmaturationatthe14thweekandanalyzedfortotalNand15Ncontent.Nitrogenderivedfromfertilizerwascalculated.TotalNuptakeinplantsconsistentlyincreaseduntilthe11thweek.Afterthat,itstartedtoplateauandfinallydeclined.Moreover,Nutilizationbyriceplantspeakedat50%,whichoccurredduringthe11thweekaftertransplanting.Nderivedfromfertilizerinriceplantswereintherangeof18.7%to40.0%inallplanttissues.TheremainingNwasderivedfromsoil.Basedonthisstudy,NreleasefromCRFshouldcompletebythe11thweekafterplantingtoensurethemaximumfertilizerNuptakebyriceplants.EfficientCRFshouldcontributetohigherNderivedfromfertilizerwhichalsoresultedinahighertotalNuptakebyriceplants,increasingthepotentialofricetoproducehigheryieldwhileatthesametimeofreducingloss.