豇豆荚螟幼虫头部形态及化学感受器观察

摘要

[目的]了解豇豆英螟(Maruca vitrata)幼虫头部感受器的形态、数量和分布,为探讨其功能和感应机制提供依据.[方法]利用扫描电镜对豇豆英螟5龄幼虫的头部以及触角和口器上的化学感受器进行扫描观察并描述.[结果]豇豆英螟幼虫的头式为下口式;头上具有单眼、触角、感觉刚毛、上唇、上颚、下颚、下唇、吐丝器;幼虫的触角上存在检形、锥形和毛形3种感受器;口器附肢下颚须上有8个锥形感受器;下唇须在第2、3节上各着生有1个锥形感受器.[结论]豇豆英螟幼虫头部共有4种类型的感受器:毛形感受器(Str)、锥形感受器(Sb)、小锥形感受器(Sbs)和栓形感受器(Ss),各自担负着不同的功能.%[Objective]The morphology, amount and distribution of chemoreceptors on the head of Maruca vitrata (Fabricius) were observed, which will provide a basis for its functional and mechanical research.[Method]The chemoreceptors on antennae and mouthparts of the 5th instar larvae of M.vitrata were observed with scanning electron microscopy.[Result]The head structure type of the larvae was hypognathous.Three kinds of chemoreceptors were found on antennae of the larvae, namely sensilla styloconicum, sensilla basiconica and sensilla trichodea.The mouthparts bears plenty of hemoreceptors, especially on gelea and maxillary palpus of maxilla.The maxillary palpus of mouthparts appendages had eight kinds of sensilla basiconica, and one kind of sensilla basiconica was also observed on the second and third segments of labial palpus respectively.[Conclusion]There are four types of chemoreceptors on the head of M.vitrata larvae, named sensilla trichodea, sensilla basiconica, small sensilla basiconica and sensilla styloconicum with different functions.