云南錦斑蛾幼蟲觸角和口器感器的超微結構

李根層 糯淑梅 吳春 楊安錦 劉乃勇

摘要

利用掃描電子顯微鏡技術，研究了云南錦斑蛾幼蟲頭部觸角和口器上的感器。結果表明，云南錦斑蛾幼蟲頭部呈橢球形。每根觸角上具有1根毛形感器、1根刺形感器、5根錐形感器和1根栓錐形感器。上唇兩側各有6根刺形感器。內唇分布有6根刺形感器、4根內唇感器和2根指形感器。每個上顎表面具有2根刺形感器。下顎的感器主要分布在外顎葉和下顎須上，每片外顎葉上具有3根刺形感器、3根錐形感器和2根栓錐形感器;每根下顎須上具有8根錐形感器。每根下唇須上具有1根錐形感器和1根栓錐形感器。因此，錐形感器是云南錦斑蛾幼蟲頭部數量最多的感器，可能是幼蟲搜尋寄主的關鍵感器;不同類型的感器在長度上存在差異。

??關鍵詞

云南錦斑蛾;幼蟲觸角;幼蟲口器;掃描電鏡;感器

中圖分類號：

Q965

文獻標識碼：A

DOI：10.16688/j.zwbh.2020563

Ultrastructure of sensilla on larval antennae and mouthparts of Achelura yunnanensis （Lepidoptera： Zygaenidae）

LI Genceng，NUO Shumei，WU Chun，YANG Anjin，LIU Naiyong*

（Key Laboratory of Forest Disaster Warning and Control of Yunnan Province， Southwest Forestry University， Kunming650224， China）

Abstract

Sensilla on antennae and mouthparts of Achelura yunnanensis were studied using the scanning electron microscopy technique. The results showed that its larval head was elliptical. One sensillum trichodeum （ST）， one sensillum chaeticum （SC）， five sensilla basiconica （SB） and one sensillum styloconicum （SS） were observed on each antenna. Six SC were found on each side of the labrum. Six SC， four epipharyngeal sensilla and two sensilla digitiformia were identified on the epipharynx. Each dentate mandible carried two SC. The sensilla on the maxilla were mainly distributed on the galea and maxillary palpus， in which each galea harbored three SC， three SB and two SS， and there were eight SB on each maxillary palpus. There were one SB and one SS on each labial palpus. In summary， SB was the most abundant sensilla on larval heads of A.yunnanensis， suggesting its key roles in host searching behaviors of larvae. In addition， various types of sensilla in length were different.

Key words

Achelura yunnanensis;larval antenna;larval mouthpart;scanning electron microscopy;sensillum

昆蟲頭部具有觸角和口器等重要化感器官，是其取食和感覺中心。不同化感器官表面著生有不同類型的化學感受器，負責感受和識別環境中成千上萬的氣味分子，包括配偶釋放的性信息素、寄主或非寄主植物釋放的揮發物，這些信息化合物是昆蟲完成兩性交配、躲避敵害、取食和產卵、寄主定位等重要生命活動的化學信號[1-2]。研究發現，不同昆蟲或同種昆蟲不同性別和不同發育階段其化學感受器在種類、數量和功能上存在一定差異[3-4]。以鱗翅目昆蟲為例，根據化學感受器的形態特征、著生方……