Tobacco hawkmoth wings are equipped with functional odor-detecting receptors and specialized hairs that allow the insects to sense chemical cues in the air while flying, according to research published by scientists at the Max Planck Institute for Chemical Ecology. The discovery expands the understanding of insect olfaction beyond traditional antennae, proving that wings play a direct active role in sensory perception.
Max Planck Institute Identifies Wing Receptors in Manduca sexta
Researchers examined the olfactory capabilities of the wings of the tobacco hawkmoth (Manduca sexta), according to a study published in the Journal of Experimental Biology. Dr. Sonja Bisch-Knaden, lead author of the study, noted that while finding receptor proteins was a crucial first step, proteins alone are only the beginning of the sensory cascade that converts scents into nerve signals.
To establish a true sense of smell on the wings, the research team looked for specialized odor-sensitive hairs distributed along the wing edges. By gently snipping the edges from moth wings, spraying them with a fine mist of gold, and analyzing them under a scanning electron microscope, the team spotted stubbier porous hairs interspersed between slender touch-sensitive hairs. These porous structures serve as the classic hallmarks of insect scent sensors.
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Researchers collected mRNA from the insects’ wings and identified 33 taste and scent receptors, with 15 of those receptors produced along the wing’s edge where the odor-sensing hairs are located.
Testing Hawkmoth Wing Olfaction Under Laboratory Conditions
When cross-referencing the discovered receptor proteins with known odors, the authors concluded that the moth’s wings likely sense bitter flavors and the aroma of amines, which carry a scent profile resembling rotting fish to humans. To put this to the test, researchers rigged a moth wing to an electrical circuit and blew various puffs of odors across it.
The tested scents ranged from putrid pyridine and fruity methyl hexanoate to the heady aroma of Datura flowers. Surprisingly, the wing responded to only two specific odors: pyrrolidine and piperidine. Both compounds are stinky amines found naturally in the leaves of nightshade plants, which serve as the preferred egg-laying sites for tobacco hawkmoths.
Further experimentation revealed the persistence of this sensory network. When researchers trimmed the edges off the wings and retested their scent detection, the wings could still detect the unpleasant amine odors. According to Dr. Bisch-Knaden, this indicates that the moth possesses special sensory hairs across its wings rather than being strictly confined to the outer edges.
Frequently Asked Questions
Do all moths have odor receptors on their wings?
Current research from the Max Planck Institute for Chemical Ecology specifically confirms this capability in the tobacco hawkmoth (Manduca sexta).
What specific smells can hawkmoth wings detect?
According to the published study, the wings specifically detect stinky amines such as pyrrolidine and piperidine found in nightshade plants.
Are antennae still the main organ of smell for moths?
The study suggests the insects use their wings — not just their antennae — to sense chemical cues in the air while flying.
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