简介:本刊讯最近,笔者从广西科技厅有关公告获悉,广西15个水果项目被评为2015年自然科学基金项目。这些项目包括:广西常绿猕猴桃的遗传多样性及常绿关联性状SCoT标记研究,广西甜瓜黄斑病毒(MYSV)的分布及遗传多样性研究,广西野生毛葡萄响应炭疽病菌侵染的转录组分析及功能基因挖掘,卡亡果与扁桃cpDNA高通量测序及结构分析,广西毛葡萄酒香气物质变化规律及酿造贮藏工艺对其影响研究,广西葡萄霜霉病菌遗传多样性分析,嫁接诱导厚皮甜瓜DNA甲基化表观遗传变异机理研究,柁果成熟衰老过程中乙烯受体ETR1基因表达与调控研究,
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.