A female-biased odorant receptor tuned to the lepidopteran sex pheromone in parasitoid Microplitis mediator guiding habitat of host insects

作者：Shuang Shan, Xuan Song, Adel Khashaveh, Shan‐Ning Wang, Ziyun Lu, Khalid Hussain Dhiloo, Ruijun Li, Yong‐Jun Zhang · 发表于：Journal of Advanced Research · 年份：2022 · DOI：10.1016/j.jare.2022.03.006 · 被引用次数：36 · 研究领域：Neurobiology and Insect Physiology Research、Insect-Plant Interactions and Control、Insect Pheromone Research and Control

INTRODUCTION: The parasitoid wasp Microplitis mediator is an important natural enemy of the turnip moth Agrotis segetum and other Noctuidae pests. In our field observation, it was fortuitously discovered that sex pheromone traps used for A. segetum also attract female wasps, verified by a simulated field condition dual-choice laboratory assay. Therefore, it was hypothesized that olfactory recognition could be crucial in this process. In this regard, a female-biased odorant receptor of the wasp, MmedOR49, attracted our attention. OBJECTIVES: To unravel the significance of the female-biased MmedOR49 regulating host pheromone recognition. METHODS: Expression analysis (fluorescence in situ hybridization; quantitative realtime PCR), in vitro (two-electrode voltage-clamp recordings) and in vivo (RNAi combined with behavioral assessments) functional studies, and bioinformatics (structural modeling and molecular docking) were carried out to investigate the characteristics of MmedOR49. RESULTS: MmedOR49 expression was detected in the antennae of females by FISH. Quantification indicated that the expression level of MmedOR49 increased significantly after adult emergence. In vitro functional study revealed that MmedOR49 was specifically tuned to cis-5-decenyl acetate (Z5-10:Ac), the major sex pheromone component of A. segetum. Molecular docking showed that Z5-10:Ac strongly bound to the key amino acid residues His 80, Ile 81, and Arg 84 of MmedOR49 through hydrogen bonding. Behavioral a...