数字农科院2.0

Functional analysis of odorant-binding proteins for the parasitic host location to implicate convergent evolution between the grain aphid and its parasitoid Aphidius gifuensis

文献类型： 外文期刊

作者： Xin Jiang;;Jun Jiang; Miaomiao Yu; Siyu Zhang; Yaoguo Qin; Yun Xu;Frederic Francis ;Jia Fan; Julian Chen

关键词： Aphidifus gifuensis; Odorant-binding protein (OBPs) ; (E)-β-farnesene (EBF); Convergent evolution;Olfactory plasticity

期刊名称： International Journal of Biological Macromolecules

ISSN： 0141-8130

年卷期： 2023 年

页码：

收录情况： SCIE（2023版）

摘要： (E)-β-farnesene (EBF) is a typical and ecologically important infochemical in tri-trophic level interactions among plant-aphid-natural enemies. However, the molecular mechanisms by which parasitoids recognize and utilize EBF are unclear. In this study, we functionally characterized 8 AgifOBPs in Aphidifus gifuensis, one dominant endo-parasitoid of wheat aphid as well as peach aphid in China. Among which, AgifOBP6 was the only OBP upregulated by various doses of EBF, and it showed a strong binding affinity to EBF in vitro. The lack of homology between AgifOBP6 and EBF-binding proteins from aphids or from other aphid natural enemies supported that this was a convergent evolution among insects from different orders driven by EBF. Molecular docking of AgifOBP6 with EBF revealed key interacting residues and hydrophobic forces as the main forces. AgifOBP6 is widely expressed among various antennal sensilla. Furthermore, two bioassays indicated that trace EBF may promote the biological control efficiency of A. gifuensis, especially on winged aphids. In summary, this study reveals an OBP (AgifOBP6) that may play a leading role in aphid alarm pheromone detection by parasitoids and offers a new perspective on aphid biological control by using EBF. These results will improve our understanding of tritrophic level interactions among plant-aphid-natural enemies.

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