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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： Shan, Shuang 1 ; Wang, Shan-Ning 1 ; Song, Xuan 1 ; Khashaveh, Adel 1 ; Lu, Zi-Yun 5 ; Dhiloo, Khalid Hussain 6 ; Li, 1 ;

作者机构： 1.Chinese Acad Agr Sci, Inst Plant Protect, State Key Lab Biol Plant Dis & Insect Pests, Beijing 100193, Peoples R China

2.China Agr Univ, Coll Plant Protect, Beijing 100193, Peoples R China

3.Beijing Acad Agr & Forestry Sci, Inst Plant & Environm Protect, Beijing 100097, Peoples R China

4.Agr Univ Hebei, Coll Plant Protect, Baoding 071000, Peoples R China

5.Hebei Acad Agr & Forestry Sci, Key Lab Integrated Pest Management Crops Northern, Minist Agr, Plant Protect Inst,IPM Ctr Hebei Prov, Baoding 071000, Peoples R China

6.Sindh Agr Univ, Fac Crop Protect, Dept Entomol, Tandojam 70060, Pakistan

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 （ 影响因子：4.714； 五年影响因子：4.953 ）

ISSN： 0965-1748

年卷期： 2019 年 114 卷

页码：

收录情况： SCI

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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