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首页> 外文期刊>Bulletin of Entomological Research >Penetration and encapsulation of the larval endoparasitoid Exorista larvarum(Diptera: Tachinidae) in the factitious host Galleria mellonella (Lepidoptera: Pyralidae)
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Penetration and encapsulation of the larval endoparasitoid Exorista larvarum(Diptera: Tachinidae) in the factitious host Galleria mellonella (Lepidoptera: Pyralidae)

机译：幼虫内寄生性幼虫Exorista larvarum（双翅目：Tachinidae）在人为宿主的Galleria mellonella（鳞翅目：Pyralidae）中的渗透和包囊。

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The tachinid fly Exorista larvarum (L.) (Diptera: Tachinidae) is a polyphagous larval endoparasitoid that deposits its eggs on the host exoskeleton of lepidopteran and tenthredinid larvae. The attachment of larval E. larvarum and the formation of therespiratory funnel were studied during infestation in the last larval instar of the wax moth, Galleria mellonella (L.) (Lepidoptera: Pyralidae). The tachinid larvae burrow through the host integument after hatching, using their robust cephalopharyngeal skeleton, leaving a dark spot at the point of their penetration as a result of host cuticle melanization. Endoparasitoid penetration induces the host cellular defence, resulting in the formation of a haemocyte capsule consisting of multi-cellular sheaths.This enveloping capsule later undergoes melanization, which is mostly obvious towards the posterior part of the endoparasitoid. The endoparasitoid uses the host encapsulation response to build a respiratory funnel from the modified host integument, leading to the host surface. The encapsulated larva remains attached to the respiratory funnel via an anal hook and cuticular spines until fully developed. Additional immunohistochemical analyses were used to study host-parasitoid interactions. Indirect immunofluorescence showed no labelling of potential tachinid antigens and confirmed no effect on the surrounding host tissues. A simulated parasitization with coated polybead microspheres revealed the mortal impact of tachinid antigens to the host. Hosts injected with antigen-coated polybeads died as a consequence of an acute and extensive immunological response to the tachinid antigens and not due to the trauma caused by foreign objects inside their body.
机译：子蝇Exorista larvarum（L.）（Diptera：Tachinidae）是一种多食性幼虫类内寄生虫，其卵沉积在鳞翅目和拟除虫菊酯的宿主外骨骼上。在蜡蛾的最后一个幼虫期中，对幼虫大肠杆菌的附着和吸气漏斗的形成进行了研究，该幼虫是在Malleria mellonella（L。）（鳞翅目：Pyralidae）身上。孵化后，金枪鱼幼虫会通过宿主坚韧的头咽咽喉骨骼钻入宿主的被膜，并因宿主表皮黑化而在其穿透点留下一个黑点。内胚层渗透会诱导宿主细胞防御，导致形成由多细胞鞘组成的血细胞囊，随后该囊被黑化，这在内寄生虫的后部最为明显。内寄生物利用宿主的包囊反应从修饰的宿主外皮形成呼吸漏斗，通向宿主表面。包囊的幼虫通过肛门钩和角质层棘保持附着在呼吸漏斗上，直到完全发育。另外的免疫组化分析被用来研究宿主-寄生虫的相互作用。间接免疫荧光显示未标记潜在的类chin鱼抗原，并证实对周围宿主组织无影响。用包被的多珠微球进行的模拟寄生揭示了塔奇蛋白抗原对宿主的致命影响。注射有抗原包被的多珠的宿主死亡是由于对鱼类抗原的急性和广泛的免疫反应，而不是由于体内异物引起的创伤。

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