FEB 10, 2014 12:00 AM PST

The Tasting Mechanism of Honeybees

WRITTEN BY: Jen Ellis
If we asked you how honeybees taste, what would you say? You might say "awful" or "a bit like chicken, once you get past the stingers." If we then asked you how honeybees tasted their food, would you know the answer? Believe it or not, it's the sense of touch.

Honeybees taste things by using sensitive receptor nerve cells contained in hair-like structures known as sensilla. In the honeybees' case, sensilla may be found on the antennae, mouth and the tarsi (end portions of the honeybee's legs). Scientists have known for some time that honeybees taste their food using their tarsi, but how that information is processed and used to distinguish different tastes is not well known.

In order to study the taste mechanism, researchers from the University of Toulouse examined the reactions of hundreds of honeybees when salty, sugary or bitter solutions were exposed to the tarsi. Their results were published recently in the journal Frontiers in Behavioral Neuroscience.

Upon the honeybees exposure to various solutions, the research team monitored the tongues of the bees - retracting the tongue means a honeybee did not like the taste and would not attempt to drink the solution; extending the tongue means a honeybee liked the taste and was preparing to drink the solution. Not surprisingly, the team discovered that just like human children, honeybees are extremely sensitive to sugar and are highly attracted to it. The bees extended their tongues to drink dilute sucrose solutions as well as concentrated ones.

The team also discovered some new insights into specific receptor locations on the tarsi and how the information was processed. Nerve cell activity was measured in different areas of the tarsi to determine more specific areas of sensitivity. For example, the double claw that forms the end of the tarsi was found to be extremely sensitive to sugary solutions, while the segments immediately before the claws (the tarsomeres) had a higher sensitivity to salty solutions. Why the tarsi are so sensitive is not fully understood (since the other sense organs of honeybees contain more sensilla than the tarsi do) but it is likely an adaptive mechanism to help the honeybees distinguish the presence of nectar on the plants they land on.

Since both tarsi are involved in the tasting process, the research team wondered what would occur if each tarsus received contradicting information - for example sugar solution on one side but water on the other? They discovered that it's a literal race. While the honeybee processes the information it receives from both tarsi, it gives added weight to the side that the honeybee tastes first. When sucrose was detected first, the honeybee extended its tongue and ignored the other input, but if the first input was less attractive, the honeybee was less likely to extend its tongue for the sucrose once it detected its presence.

This paper claims to be the first integrative study on the taste mechanism of honeybees using both a behavioral and electrophysiological approach. It seems likely that this technique will be put to greater use in future insect research.
About the Author
You May Also Like
OCT 23, 2019
Genetics & Genomics
OCT 23, 2019
Revealing the Epigenetic Patterns That Specific Enzymes Create
Genomic DNA is modified by chemical markers called epigenetic tags, which can change gene expression without altering the underlying genetic code....
OCT 23, 2019
Cell & Molecular Biology
OCT 23, 2019
Discovery of Bone Bits in Blood may Help Explain Vascular Calcification
As we age, calcium can build up in various tissues in the body, and cause them to harden in a process called calcification....
OCT 23, 2019
Microbiology
OCT 23, 2019
Researchers Reconstruct the HIV Genome From a Sample Taken in 1966
Now there is biological evidence that the virus infected people in Africa before it was identified in the US....
OCT 23, 2019
Neuroscience
OCT 23, 2019
Neuroscientists discover gut-brain superhighway
The gut and brain communicate - typically through hormones. Throughout the day, your gut releases hormones that travel through the bloodstream and, over the course of about 10 minutes, reach...
OCT 23, 2019
Immunology
OCT 23, 2019
Circadian Rhythm Governs Immune Protection of the Gut
The circadian rhythm governs more than just waking and sleeping. The intricate functions of the digestive system rely on the ticking, clock-like rhythm as ...
OCT 23, 2019
Genetics & Genomics
OCT 23, 2019
Membrane-less Organelle Found to Play a Role in Preventing Cancer
In recent years, scientists have found that a phenomenon called phase separation plays a critical role in the functions of cells....
Loading Comments...