简介：【目的】为探究转Cry1Ac/1Ab基因棉花对异色瓢虫生长发育及其捕食功能的影响。【方法】以转Cry1Ac/1Ab基因棉与其亲本常规棉为实验材料,利用取食不同棉花品种叶片的棉铃虫饲喂异色瓢虫幼虫。【结果】与常规亲本棉相比,取食饲喂转基因棉花叶片的初孵棉铃虫幼虫的异色瓢虫幼虫从1龄发育至化蛹期时间延长0.77d,但差异不显著;除1龄幼虫体重增加(0.0773mg)外,其余各龄期幼虫体重均有所下降,但差异均不显著;异色瓢虫1、2、3、4龄幼虫对初孵棉铃虫捕食量均随棉铃虫密度的增加而增加,捕食功能反应均符合HollingⅡ圆盘方程。【结论】转Cry1Ac/1Ab基因棉花对异色瓢虫生长发育无显著影响,饲喂取食转Cry1Ac/1Ab基因棉花的棉铃虫对异色瓢虫捕食功能无显著差异。

简介：Themechanismsofmagnetoreceptionhavebeenproposedasthemagnetitebased,thechemicalradical-pairandbiocompassmodel,inwhichmagnetiteparticles,thecryptochrome(Cry)oriron-sulfurclusterassembly1(IscA1)maybeinvolved.However,littleisknownabouttheassociationamongthemolecules.HereweinvestigatedthemolecularcharacterizationandthemRNAexpressionofIscA1indifferentdevelopmentalstages,tissuesandmagneticfieldsinthemigratorybrownplanthopper(BPH),Nilaparvatalugens.NlIscA1containsanopenreadingframeof390bp,encodingaminoacidsof129,withthepredictedmolecularweightof14.0kDaandtheisoelectricpointof9.10.Well-conservedFe-Sclusterbindingsiteswereobservedinthepredictedprotein.PhylogeneticanalysisdemonstratedNlIscA1tobeclusteredintotheinsect'sIscA1.NlIscA1showedup-regulatedmRNAexpressionduringtheperiodofmigration.ThemRNAexpressionofNlIscA1couldbedetectedinallthethreetissuesofhead,thoraxandabdomen,withthehighestexpressionlevelintheabdomen.ForthemacropterousmigratoryNilaparvatalugens,mRNAexpressionofNlIscA1andN.lugenscryptochromel(Nlcry1)wereup-regulatedunderthemagneticfieldsof5Gaussand10Gaussinstrength(vs.localgeomagneticfield),whileN.lugenscryptochrome2(Nlcry2)remainedstable.Forthebrachyterousnon-migratoryNilaparvatalugens,nosignificantchangeswerefoundinmRNAexpressionofNlIscA1,Nlcry1andNlcry2amongdifferentmagneticfields.ThesefindingspreliminarilyrevealthattheexpressionofNlIscA1andNlcry1exhibitedcoordinatedresponsestothemagneticfield.Itsuggestssomepotentialassociationsamongtheputativemagneto-sensitivemoleculesofcryptochromeandiron-sulfurclusterassembly.

简介：Theinsectcuticleplaysimportantrolesinnumerousphysiologicalfunctionstoprotectthebodyfrominvasionofpathogens,physicalinjuryanddehydration.Inthisreport,weconductedacomprehensivegenome-widesearchforgenesencodingproteinswithperitrophinA-type(ChtBD2)chitin-bindingdomain(CBD)inthesilkworm,Bombyxmori.Oneofthesegenes,whichencodesthecuticleproteinBmCBP1,wasadditionallycloned,anditsexpressionandlocationduringtheprocessofdevelopmentandmoltinginB.moriwereinvestigated.Intotal,46protein-codinggeneswereidentifiedinthesilkwormgenome,includingthoseencoding15cuticleproteinsanalogoustoperitrophinswithoneCBD(CPAP1s),ninecuticleproteinsanalogoustoperitrophinswiththreeCBD(CPAP3s),15peritrophicmembraneproteins(PMPs),fourchitinases,andthreechitindeacetylases,whichcontainedatleastoneChtBD2domain.MicroarrayanalysisindicatedthatCPAP-encodinggeneswerewidelyexpressedinvarioustissues,whereasPMPgeneswerehighlyexpressedinthemidgut.QuantitativepolymerasechainreactionandwesternblottingshowedthatthecuticleproteinBmCBP1washighlyexpressedintheepidermisandhead,particularlyduringmoltingandmetamorphosis.Animmunofluorescencestudyrevealedthatchitinco-localizedwithBmCBP1attheepidermalsurfaceduringmolting.Additionally,BmCBP1wasnotablyup-regulatedby20-hydroxyecdysonetreatment.Theseresultsprovideagenome-levelviewofthechitin-bindingproteininsilkwormandsuggestthatBmCBP1participatesintheformationofthenewcuticleduringmolting.

简介：Pheromone-bindingproteins(PBPs)arethoughttobindandtransportsexpheromonesontotheolfactoryreceptorsonthedendritemembraneofolfactoryneurons,andthusplayavitalroleinsexpheromoneperception.However,thefunctionofPBPshasrarelybeendemonstratedinvivo.Inthisstudy,twoPBPs(PBP1andPBP3)ofChilosuppressalis,oneofthemostnotoriouspyralidpests,wereinvivofunctionallycharacterizedusinginsectswiththePBPgeneknockedoutbytheCRISPR/Cas9system.First,throughdirectinjectionofPBP-singleguideRNA(sgRNA)/Cas9messengerRNAintonewlylaideggs,ahighrateoftarget-geneediting(checkedwithpolledeggs)wasinducedat24hafterinjection,21.3%forPBPl-sgRNAinjectedeggsand19.5%forPBP3-sgRNAinjectedeggs.Second,byanin-crossingstrategy,insectswithmutantPBP1orPBP3(bothwithaprematurestopcodon)werescreenedandhomozygousmutantswereobtainedintheG3generation.Third,themutantinsectsweremeasuredforelectroantennogram(EAG)responsetofemalesexpheromones.Asaresult,bothPBPmutantmalesdisplayedsignificantreductioninEAGresponse,andthisreductioninPBP1mutantswashigherthanthatinPBP3mutants,indicatingamoreimportantroleofPBP1.Finally,therelativeimportanceoftwoPBPsandthepossibleofftargeteffectinducedbysgRNA-injectionarediscussed.Takentogether,ourstudyprovidesadeeperinsightintothefunctionofandinteractionbetweendifferentPBPgenesinsexpheromoneperceptionofC.suppressalis,aswellasavaluablereferenceinmethodologyforgenefunctionalstudyinothergenesandothermothspecies.

简介：【目的】薇甘菊颈盲蝽是入侵植物薇甘菊的天敌昆虫。CYP4家族基因在专食性昆虫与宿主植物的相互作用中发挥着极其重要的作用,探明其在不同部位的表达情况,可为薇甘菊生物控制提供科学依据。【方法】采用RACE技术克隆薇甘菊颈盲蝽CYP基因,实时荧光定量PCR检测其在不同部位的表达情况。【结果】PmCYP4C1基因全长1713bp,其中ORF长1500bp,共编码500个氨基酸,理论分子质量为57.44ku,无信号肽;与其他昆虫CYP4家族基因的同源性大于40%,与温带臭虫CYP的亲缘关系最近。该基因在雌、雄虫各部位均有表达,且都是足部的表达量明显地高于其他部位;雌、雄虫的表达差异在于雄虫翅膀中的表达量明显地高于触角和残体,但在雌虫中这3个部位的表达量无显著差异,且雄虫翅膀中的表达量显著地高于雌虫,是其2.37倍。【结论】薇甘菊颈盲蝽PmCYP4基因除参与代谢有毒物质外,其主要功能可能是编码与薇甘菊颈盲蝽运动相关的酶。