中红侧沟茧蜂多分DNA病毒基本特征研究

Characterization of Microplitis mediator Polydnavirus

本文首次报道中红侧沟茧蜂 (Microplitismediator)雌蜂卵巢中存在多分DNA病毒 (MicroplitismediatorPlolyd navirus,MmPDV) ,初步研究了MmPDV形态和基本生理生化特征。利用蔗糖密度梯度超速离心分离纯化了MmPDV粒子 ,电镜负染显示PDV粒子分三段 ,带有一明显的尾部结构 ,大小约为 130× 35nm ;SDS PAGE电泳条带较多 ,至少可以分辨出 2 6个电泳条带 ,表明病毒粒子衣壳蛋白复杂 ;琼脂糖凝胶电泳显示MmPDV基因组至少由大小不同、丰度不等的 14个DNA分子组成 ,用 6种内切酶 (EcoRI,HindIII,BssHII,PstI,BamHI,BglI)酶切MmPDV基因组后 ,估算出MmPDV基因组大小约为 10 8kb。用雌蜂输卵管萼液注射小地老虎幼虫 ,注射后的小地老虎体重和龄期发育动态表明 。

A polydnavirus(PDV)was purified by sucrose density gradient centrifugation from the calyx region of female parasitoid wasp Microplitis mediator (Hymenoptera:Braconidae).Negative stain technique showed that the virus was tadpole like and measured 130×35nm.A diverse protein profile of the virus'capsid proteins was displayed by SDS PAGE.Its genome was composed of over 14 DNA molecules,which were different in molecular size and abundance.Molecular size of the genome was approximate 108 kbp calculated by patterns from six restrict endonucleases digestion.Micro injection experiment with calyx fluid of the female wasps showed that the virus suppressed growth and development of host of the wash.