Ochieng S A, Park K C, Zhu J W, Baker T C
Department of Entomology, 411 Science II Building, Iowa State University, Ames, IA 50011, USA.
Arthropod Struct Dev. 2000 Jul;29(3):231-40. doi: 10.1016/s1467-8039(01)00008-1.
The specialist parasitoid, Microplitis croceipes (Cresson) (Hymenoptera: Braconidae), uses chemical cues from plants damaged by herbivore-feeding and also plant by-products in host location and acceptance. These chemicals are detected by the wasp's antennae. We conducted scanning and transmission electron microscopy studies of male and female M. croceipes antennae and detected no distinct morphological differences in the chemoreceptors between the sexes. Male antennae are approximately twice as long as female antennae. We found five morphological sensillar types in both sexes: sensilla (s) trichodea were the most abundant and distributed over the whole antenna; s. chaetica were present in low numbers only on the scape and pedicel; and s. basiconica, s. coeloconica and elongated s. placodea were found only on the flagellum. Ultrastructural investigations revealed pore systems on s. basiconica and s. placodea. In s. placodea, sensory neurons run parallel to the longitudinal axis of the sensilla with terminal pores. We recorded responses from single olfactory receptor neurons in s. placodea to two plant-emitted volatiles, cis-3-hexenol and ocimene, and two anthropogenic compounds, cyclohexanone and 2-diisopropylaminoethanol. Male receptor neurons were more sensitive than those of females with significantly higher spike frequency being registered from neurons in males.
专性寄生蜂玫烟色棒束孢（Microplitis croceipes (Cresson)，膜翅目：茧蜂科）在寄主定位和接受过程中，利用来自草食动物取食损伤植物的化学信号以及植物副产品。这些化学物质由黄蜂的触角检测。我们对玫烟色棒束孢雌雄蜂的触角进行了扫描电子显微镜和透射电子显微镜研究，未发现两性化学感受器在形态上有明显差异。雄蜂触角长度约为雌蜂触角的两倍。我们在两性触角中均发现了五种形态的感器类型：毛形感器数量最多，分布于整个触角；刺形感器仅少量存在于柄节和梗节上；而锥形感器、腔锥形感器和细长的板形感器仅在鞭节上发现。超微结构研究揭示了锥形感器和板形感器上的孔系统。在板形感器中，感觉神经元与具有末端孔的感器纵轴平行排列。我们记录了板形感器中单个嗅觉受体神经元对两种植物释放的挥发物顺-3-己烯醇和罗勒烯，以及两种人为化合物环己酮和2-二异丙基氨基乙醇的反应。雄蜂的受体神经元比雌蜂的更敏感，雄性神经元记录到的脉冲频率明显更高。
