颈双缘姬蜂寄生引起小菜蛾蛹脂肪体形态和超微结构的变化  

Effects of parasitism by Diadromus collaris (Hymenoptera:Ichneumonidae) on morphology and ultrastructure of fat body and adipocytes of host Plutella xylostella (Lepidoptera:Plutellidae) pupae

作　　者：郦卫弟[1] 时敏[1] 陈学新[1] 

机构地区：[1]浙江大学昆虫科学研究所

出　　处：《昆虫学报》2007年第7期662-666,共5页Acta Entomologica Sinica

基　　金：国家自然科学基金项目(30370959);国家杰出青年科学基金项目(30625006);教育部"新世纪优秀人才支持计划"项目(NCET-04-0521)

摘　　要：采用光学和电子显微镜观察了颈双缘姬蜂Diadromus collaris(膜翅目:姬蜂科)寄生后小菜蛾Plutella xylostella(鳞翅目:菜蛾科)蛹脂肪体形态、超微结构和脂肪细胞的变化。结果表明:被寄生72h后小菜蛾蛹脂肪体结构松散,细胞游离,细胞膜破裂;细胞内营养物质开始被动地消耗;细胞器数量减少,细胞核内染色质状态发生变化。这些现象说明寄生对寄主的脂肪体结构及脂肪细胞产生了明显的影响,这有利于为幼蜂的发育提供营养。In order to determine the effects of parasitism by Diadromus collaris （Hymenoptera： Ichneumonidae） on structure of fat body of host Plutella xylostella （Lepidoptera： Plutellidae） pupae, the morphology and ultrastructure of pupal fat body and adipocytes of the diamondback moth, P. xylostella parasitized by D. collaris were observed using light and electron microscopy. After 72 h of parasitism, the structure of fat body became loose; the adipocytes were dissociated from fat body; the membrane of adipocyte was torn, its entocyte was consumed passively, the number of apparatus of cell reduced, and the morphology of nuclear chromatin was changed. It is so concluded that parasitism by parasitoid can make host fat body and adipocytes fell to pieces, and this is advantageous for development of parasitoid.

关 键 词：颈双缘姬蜂 小菜蛾 脂肪体 脂肪细胞 超微结构 寄生 

分 类 号：Q965.8[生物学—昆虫学]