预览加载中，请您耐心等待几秒...

共生菌Wolbachia调控灰飞虱卵形成的分子机制研究.docx

预览
1/2
2/2

在线预览结束，喜欢就下载吧，查找使用更方便

下载提示 文本预览

如果您无法下载资料，请参考说明：

1、部分资料下载需要金币，请确保您的账户上有足够的金币

2、已购买过的文档，再次下载不重复扣费

3、资料包下载后请先用软件解压，在使用对应软件打开

共生菌Wolbachia调控灰飞虱卵形成的分子机制研究 Wolbachiaisagroupofintracellularbacteriathatinfectawiderangeofarthropods,includinginsectsandspiders.Thesebacteriaarepresentinhighfrequenciesinmanyinsectspecies,includingmosquitoes,fruitflies,andleafhoppers.Wolbachiahasbeenwidelystudiedduetoitsfascinatingabilitytomanipulatethereproductivebiologyofitshosts,includingtheregulationofeggformationingrayleafhoppers. Grayleafhoppers(Nephotettixspp.)areoneofthemosteconomicallyimportantpestsofricecrops,causingsignificantyieldloss.TheabilityofWolbachiatoregulategrayleafhoppereggformationhasattractedattentionasapotentialmethodforcontrollingthispest.Understandingthemolecularmechanismsunderlyingthisregulationiscrucialfordevelopingeffectivecontrolstrategies. RecentstudieshaveprovidedinsightsintothemolecularmechanismsbywhichWolbachiamanipulateseggformationingrayleafhoppers.Onekeymechanisminvolvestheinductionofparthenogenesis,theproductionofoffspringfromunfertilizedeggs.Wolbachia-infectedfemalesarecapableofproducingviableoffspringwithoutmating,givingthemaselectiveadvantageoveruninfectedindividuals. TheinductionofparthenogenesisinWolbachia-infectedgrayleafhoppersismediatedbythebacteria'smanipulationofhostgeneexpression.IthasbeenfoundthatWolbachiaupregulatestheexpressionofcertaingenesinthegermlineofinfectedfemales,leadingtothedevelopmentofunfertilizedeggs.Thesegenesareinvolvedinkeyprocessessuchasoogenesisandeggmaturation.Furthermore,thebacteriacanalsosuppressgenesthatareessentialforspermproductionininfectedmales,therebypreventingfertilizationandpromotingparthenogenesis. AnothermechanismbywhichWolbachiaregulatesgrayleafhoppereggformationisthroughthemanipulationofhosthormonalsignalingpathways.Wolbachiahasbeenshowntointerferewiththesynthesisandsignalingofjuvenilehormones,whichareessentialfortheproperdevelopmentandmaturationofeggs.Bymodulatingjuvenilehormonelevels,Wolbachiacaninfluenceeggdevelopmentandfertilityingrayleafhoppers. Inadditiontohormonalmanipulation,Wolbachiacanalsoinfluenceeggformationbyinterferingw