简介：ＲＯＬＥＯＦＷＯＭＥＮＩＮＳＯＣＩＡＬＦＯＲＥＳＴＲＹＰＲＯＪＥＣＴｂｙＹｕａｎＧｕｏｓｈｅｎｇＳｉｎｃｅｉｔｓｉｍｐｌｅｍｅｎｔａｔｉｏｎｉｎ１９９２，ｔｈｅＦｕｊｉａｎＳｈｏｕｎｉｎｇＳｏｃｉａｌＦｏｒｅｓｔｒｙＰｒｏｊｅｃｔｇｏｖｅｒｎｍｅｎｔ...

简介：Thetreesinurbanlandscapes,independentofwhethertheyareinurbanforestsorstandalone,canimproveenvironmentquality,enhanceindividualandcommunitywell-being,provideawiderangeofservicestoindividualsandcommunities,andproduceamorehealthfulandcomfortableenvironmentforthevastmajorityofthepopulation.Knowledgeofthepotentialsignificanceoftreesinurbanlandscapesisexpandingrapidlyasresearchcontinuestodocumenttheimportantrolethaturbanforestsandtreescanplayinimprovingthequalityofurbanlife.Theenvironmentalconditionsinurbanlandscapesare,however,verydifferentfromthenaturalconditionsthatthetreespeciesareadaptedto.Thisposesbigchallengestotheurbanforestryinitseffortstocreatehealthyandvaluabletreesinurbanlandscapes.Onlythroughimplementingsomeimportantmeasureswecanensurehighsurvivalrateofsaplingsandwell-beingandlongevityofurbantrees.

简介：Ricefieldsareecosystemswithmanytypesofplants,microbes,invertebrates,birdsandanimals.Thericefarmingprotectsthebiodiversityoftheregionandmaintainstheecosystemforthebenefitofenvironment.Somericevarietiesreleasebiocidalallelochemicalswhichmightaffectmajorweeds,microbialandpathogenicdiversityaroundriceplants,evensoilcharacteristics.Alargenumberofcompoundssuchasphenolicacids,fattyacids,indolesandterpeneshavebeenidentifiedinricerootexudatesanddecomposingriceresidues,asputativeallelochemicalswhichcaninteractwithsurroundingenvironment.Sincetheseallelopathicinteractionsmaybepositive,theycanbeusedaseffectivecontributorforsustainableandeco-friendlyagro-productionsystem.Geneticmodificationofcropplantstoimprovetheirallelopathicpropertiesandenhancementofdesirabletraitshasbeensuggested.Developmentofcropswithenhancedallelopathictraitsbygeneticmodificationshouldbedonecautiously,keepinginviewoftheecologicalriskassessment(non-toxicandsafeforhumansandecosystem,cropproductivity,ratioofbenefitandcost,etc.).

简介：TheroleoforganicmatterintheformationandstabilityofsoilaggregatesinmulberryplantationintheHang-Jia-HuPlain,northernZhejiangProvince,wasevaluatedinthisstudy.Apositivecorrelationwasfoundbetweenwater-stableaggregatecontentsandorganicmattercontentsinthemulberryplantationsoils,whichsupportedthehypothesisthatorganicmatterwasthemaincementingagentinformationofaggregates.Aclosecorrelationwasalsofoundbetweenstabilityofaggregateandorganicmattercontents.Regressionanalysisshowedthattotalnitrogencontentwasalsoanindicatorofwater-stableaggregatecontentandstability.Theaggregatesizedistributionindicatedthatthewater-stableaggregates1～0.25mmindiameterwerethemajorcomponentoftheaggregatesinthemulberryplantationsoils.Theorganicmattercontentsofaggregatesrangingfrom5to0.25mmindiameterincreasedwiththedecreaseofaggregatesizes,andtheaggregates1～0.25mmindiameterhadthemaximumorganicmattercontent.

简介：Lichensplayanunparalleledlyvitalroleinweatheringandsoil-formingprocessesinAntarcticregion,InthisstudysomerelatedchemicalcomponentsandmicromorphologicalanalyseshavebeencarriedoutonthesamplesoftheweatheredrocksandthelichensgrownonthemfromFilesPeninsula,Antarctic,Theresultsindicatiedthatthemajorchemicalcomponentsinthebioweatheringsurfacelayerofthesampledrockshavebeenobviouslyalteredandtheweatheringpotentialinthislayerhasgreatlydecreasedbyandaveragerangearound4.66percentin4samples,Intheweatheringsurfacelayerferruginiztionofsomemineralsinvaryingdegresswasseenbymeansofmicroscopicexaminationthroughthethinsectionoftheweatheredrocks,anditsproductsprovedtobedominatedbyhematitie,limonite,goethiteandfreeironoxidesMeanwhile,thestudysuggestedthatthedissolutionandabsorptionoflichensbytheirsecretionacceleratedtheprocessofcalcitizationofmineralsinthebio-weatheringsufacelayer,Eventually,theresultsalsoshowthatdifferentspeciesoflichensplaydifferentrolesinweatheringandsoil-formingproesses.

简介：Genesarecontinuallybeingcreatedbytheprocessesofgenomeduplication(ohnolog)andgeneduplication(paralog)Whole-genomeduplicationshavebeenfoundtobewidespreadinplantspeciesandplayanimportantroleinplantevolution.Clearlyun-overlappingduplicatedblocksofwhole-genomeduplicationscanbedetectedinthegenomeofsequencedrice(Oryzasativa).Syntenicohnologpairs(ohnologues)ofthewhole-genomeduplicationsinricewereidentifiedbasedontheirsyntenicduplicatelines.Theparalogsofohnologueswerefurtherscannedusingmulti-roundreciprocalBLASTbest-hitsearching(E＜e-14).Theresultsindicatedthatanaverageof0.55sisterparalogscouldbefoundforeveryohnologueinrice.Theseresultssuggestthatsmall-scaleduplications,aswellaswhole-genomeduplications,playasignificantroleinthetwoduplicatedricegenomes.

简介：ＶＩＬＬＡＧＥＦＯＲＥＳＴＲＹＳＴＡＴＩＯＮＳＰＥＲＦＯＲＭＡＮＩＭＰＯＲＴＡＮＴＲＯＬＥＩＮＣＨＩＮＡ’ＳＳＯＣＩＡＬＦＯＲＥＳＴＲＹＤＥＶＥＬＯＰＭＥＮＴＢｙＺｈｕＴｕｅ；ＷａｎｇＬｉｐｉｎｇ；ＳｈｉＷｅｎｋａｉＴｈｅＲｅｌａｔｉｏｎｓｈｉｐＢｅ...

简介：Lipoxygenase3(LOX3)isamajorcomponentoftheLOXisozymesinmaturericeseeds.ToinvestigatetheroleofLOX3geneunderstresses,aplantexpressionvectorcontainingantisensecDNAofLOX3wasconstructed.RicevarietiesWuyunjing7andKasalathweretransformedbytheAgrobacterium-mediatedmethodandtransgenicriceplantsweregenerated.PCRandSouthernblotresultsshowedthattheantisenseLOX3genewasintegratedintothericegenome.AnalysesofembryoLOX3deletionandsemi-quantitativeRT-PCRconfirmedtheantisensesuppressionofLOX3geneintransgenicplants.TheT2antisenseplantsofLOX3weresensitivetodroughtstress,riceblastandbacterialblightcomparedwithnon-transgenicplants.TheseresultssuggestthattheLOX3genemightfunctioninresponsetostresses.

简介：与他们的男、女的父母一起的十F1联合被采用在flowering和早谷物充满阶段期间评估他们的热忍耐。米饭植物被使遭到加热应力(39??????僚吗？？

简介：Inthemiddle1970s,people’sawarenesstoforestryandtheimportantroleofforestryinruraldevelopmenthadgeneratedtremendouschanges,andthe8thWorldForestryCongress,convenedin1978,hasbecomeaturningpointforrevisingtheirforestrydevelopingstrategiesandforestrydevelopingpr