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首页> 外文期刊>The Southeast Asian journal of tropical medicine and public health >MIDGUT ULTRASTRUCTURE OF FOURTH INSTAR OCHLEROTATUS TOGOI (DIPTERA: CULICIDAE)
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MIDGUT ULTRASTRUCTURE OF FOURTH INSTAR OCHLEROTATUS TOGOI (DIPTERA: CULICIDAE)

机译：第四龄O鱼多哥的中间超微结构（双翅目：CULICIDAE）

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摘要

The ultrastructure of the midgut of fourth instar Ochlerotatus togoi was investigated by light, scanning and transmission electron microscopy. This study was performed to provide information to help devise future control efforts aimed at the larval stages of this vector of filariasis. The fourth instar midgut was approximately 2 mm in length and consisted of three morphologically distinct cell types: epithelial, regenerative, and endocrine cells. There was a monolayer of epithelial cells on the luminal surface of the midgut, with multiple folds of the plasma membrane where it adjoined the basement membrane. Regenerative cells were scattered throughout the basal portion of the epithelium, along with endocrine cells. No evidence of division or differentiation was seen in any of the cell types. Six layers of the peritrophic matrix were observed in the gut lumen which separated ingested food from the midgut epithelial cells. Cytoplasmic protrusions were seen in many areas of the luminal midgut surface and numerous autophagosomes were seen in the epithelial cells of both early and late fourth instar larvae, suggesting autophagy is involved in the degeneration process of the midgut in preparation for pupation. This study provides a basis for understanding normal Oc. togoi larval midgut development. Further studies are needed to determine the factors that control larval growth and the nutritional state. Such information could be used to reduce adult fecundity and develop biological control mechanisms.
机译：通过光镜，扫描电镜和透射电镜观察了多龄Ochlerotatus togoi中肠的超微结构。进行这项研究是为了提供信息，以帮助设计针对这种丝虫病载体幼虫期的未来防治工作。第四龄中肠长约2毫米，由三种形态上不同的细胞类型组成：上皮细胞，再生细胞和内分泌细胞。中肠腔表面有单层上皮细胞，质膜与基底膜相连处有多个折叠的质膜。再生细胞与内分泌细胞一起散布在整个上皮的基底部分。在任何细胞类型中均未见分裂或分化的迹象。在肠腔中观察到六层营养丰富的基质，其将摄取的食物与中肠上皮细胞分开。在四龄幼虫的早期和晚期幼虫的上皮细胞中，在腔中肠表面的许多区域均可见细胞质突起，并观察到许多自噬体，这表明自噬参与了中肠的退化过程，为化脓做准备。该研究为理解正常OC提供了基础。多哥幼虫中肠发育。需要进一步研究以确定控制幼虫生长和营养状态的因素。此类信息可用于减少成年繁殖力并发展生物控制机制。

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