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Antennal Ionotropic Receptors Ir64A1 And Ir64A2 Of The Parasitoid Wasp Microplitis Mediator (Hymenoptera: Braconidate) Collaboratively Perceive Habitat And Host Cues

文献类型： 外文期刊

作者： Gao, Xi-Wu;Shan, Shuang;Zhang, Yong-Jun;Khashaveh, Adel;Shan, Shuang;Wang, Shan-Ning;Song, Xuan;Song, Xuan;Dhiloo, Khalid Hussain;Lu, Zi-Yun;Li, Rui-Jun;Wang, Shan-Ning

作者机构：

关键词： Microplitis Mediator; Antennal Ionotropic Receptors; Xenopus Oocytes Expression; Habitat Cues; Host Cues; Host-Seeking

期刊名称： INSECT BIOCHEMISTRY AND MOLECULAR BIOLOGY

ISSN： 0965-1748

年卷期： 2019 年 114 卷

页码：

收录情况： JCR（2021版）

摘要： Ionotropic receptors (IRs), as a member of the conserved chemoreceptor families in the peripheral nervous system, play a critical role in the chemoreception of Drosophila. However, little is known about IRs in Hymenoptera insects. Here, we comprehensively characterized the gene structure, topological map and chemosensory roles of antennal IRs (MmedIRs) in the hymenopteran parasitoid wasp Microplitis mediator. We found that the IRs were conserved across various insect species. In the in situ hybridization assays, most IRs showed female antennae biased features, and there was no co-expression of the IRs and the olfactory receptor co-receptor (ORco). Moreover, three IR co-expressed complexes, IR75u-IR8a, IR64a1-IR8a and IR64a2-IR8a, were detected. Two genes with high similarity, IR64a1 and IR64a2, were located in distinct neurons but projected to the same sensillum. In two-electrode voltage-clamp recordings, IR64a1 was widely tuned to the chemicals from habitat cues released from host plants over long distances, whereas IR64a2 responded to a narrow range host cues and plant odors with low-volatility. Notably, IR64a2 was able to perceive Z9-14: Ald, a vital sex pheromone component that is released from Helicoverpa armigera, which is the preferred host of M. mediator. Furthermore, most ligands of IR64a1 and IR64a2 can trigger electrophysiological responses in female wasps. We propose that IR64a1 and IR64a2 collaboratively perceive habitat and host cues to assist parasitoids in efficiently seeking hosts.

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