Key Laboratory of Forest Protection of National Forestry and Grassland Administration, Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing, China.
Zhashui County Forest Products Industry Development Center, Shangluo, Shaanxi, China.
Microsc Res Tech. 2021 Jul;84(7):1484-1497. doi: 10.1002/jemt.23704. Epub 2021 Jan 20.
The spruce bark beetle, Ips typographus, is an invasive forest pest that occurs across Eurasia. To further understand the mechanism of insect-host chemical communication and the feeding choices of adult I. typographus, we examined the sensilla on the antennae and mouthparts of I. typographus using scanning electron microscopy. No sexual dimorphism in sensilla type or distribution was observed. Ten subtypes of antennal sensilla were identified: sensilla trichodea Types I-III (TR , TR , and TR ); sensilla chaetica Types I and II (CH and CH ); sensilla basiconica Types I-III (BA , BA , and BA ); sensilla coeloconica (CO); and Böhm sensilla (BS). BA were the most abundant among the antennal sensilla in both sexes. Thirteen mouthpart sensilla subtypes were observed: sensilla trichodea Types I-IV (TR , TR , TR , and TR ); sensilla chaetica Types I-III (CH , CH , and CH ); sensilla digitiformia (DI); sensilla basiconica Types I-II (BA and BA ); and sensilla styloconica Types I-III (ST , ST , and ST ). Among these, TR were the most abundant in both sexes. The apex of each maxillary and labial palp carried the same sensilla (BA , ST , ST , and ST ), although the apex of the maxillary palp contained more total sensilla. The functional roles of each sensilla type are discussed based on their external structure and distribution. The results provide a theoretical basis for further studies on the olfactory and feeding behaviors and electrophysiology of adult I. typographus.
云杉大小蠹，Ips typographus，是一种发生在整个欧亚大陆的入侵性森林害虫。为了进一步了解昆虫-宿主化学通讯的机制和成虫 I. typographus 的取食选择，我们使用扫描电子显微镜观察了 I. typographus 触角和口器上的感觉器官。没有观察到感觉器官类型或分布的性别二态性。鉴定出 10 种触角感觉器官亚型：感觉毛Ⅰ型-Ⅲ型（TR 、TR 和 TR ）；感觉刺Ⅰ型和Ⅱ型（CH 和 CH ）；感觉锥Ⅰ型-Ⅲ型（BA 、BA 和 BA ）；感觉腔锥形（CO）；和博姆氏感觉器官（BS）。BA 在两性触角感觉器官中最为丰富。观察到 13 种口器感觉器官亚型：感觉毛Ⅰ型-Ⅳ型（TR 、TR 、TR 、TR ）；感觉刺Ⅰ型-Ⅲ型（CH 、CH 、CH ）；感觉指形（DI）；感觉锥形Ⅰ型-Ⅱ型（BA 和 BA ）；和感觉柱状锥形Ⅰ型-Ⅲ型（ST 、ST 、ST ）。在这些中，TR 在两性中最为丰富。每个上颚和下唇须的顶端都有相同的感觉器官（BA 、ST 、ST 和 ST ），尽管上颚须的顶端包含更多的总感觉器官。根据每种感觉器官类型的外部结构和分布，讨论了其功能作用。这些结果为进一步研究成虫云杉大小蠹的嗅觉和取食行为以及电生理学提供了理论基础。
