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Odorant Receptors for Detecting Flowering Plant Cues Are Functionally Conserved across Moths and Butterflies.

Abstract：

:Odorant receptors (ORs) are essential for plant-insect interactions. However, despite the global impacts of Lepidoptera (moths and butterflies) as major herbivores and pollinators, little functional data is available about Lepidoptera ORs involved in plant volatile detection. Here, we initially characterized the plant-volatile-sensing function(s) of 44 ORs from the cotton bollworm Helicoverpa armigera, and subsequently conducted a large-scale comparative analysis that establishes how most orthologous ORs have functionally diverged among closely related species whereas some rare ORs are functionally conserved. Specifically, our systematic analysis of H. armigera ORs catalogued the wide functional scope of the H. armigera OR repertoire, and also showed that HarmOR42 and its Spodoptera littoralis orthologue are functionally conserved. Pursuing this, we characterized the HarmOR42-orthologous ORs from 11 species across the Glossata suborder and confirmed the HarmOR42 orthologues form a unique OR lineage that has undergone strong purifying selection in Glossata species and whose members are tuned with strong specificity to phenylacetaldehyde, a floral scent component common to most angiosperms. In vivo studies via HarmOR42 knockout support that HarmOR42-related ORs are essential for host-detection by sensing phenylacetaldehyde. Our work also supports that these ORs co-evolved with the tube-like proboscis, and has maintained functional stability throughout the long-term coexistence of Lepidoptera with angiosperms. Thus, beyond providing a rich empirical resource for delineating the precise functions of H. armigera ORs, our results enable a comparative analysis of insect ORs that have apparently facilitated and currently sustain the intimate adaptations and ecological interactions among nectar feeding insects and flowering plants.

journal_name

Mol Biol Evol

journal_title

Molecular biology and evolution

authors

Guo M,Du L,Chen Q,Feng Y,Zhang J,Zhang X,Tian K,Cao S,Huang T,Jacquin-Joly E,Wang G,Liu Y

doi

10.1093/molbev/msaa300

subject

Has Abstract

pub_date

2020-11-24 00:00:00

eissn

0737-4038

issn

1537-1719

pii

5999809

pub_type

杂志文章

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