Peripheral modulation of worker bee responses to queen mandibular pheromone

Area of Science:

• Animal Behavior
• Neuroethology
• Chemical Ecology

Background:

• Queen mandibular pheromone (QMP) is traditionally considered a strong attractant for young worker bees.
• Previous research suggested a universal attraction to QMP among young worker bees.

Purpose of the Study:

• To investigate the nuanced responses of young worker bees to queen mandibular pheromone (QMP).
• To explore the role of early-life exposure in shaping olfactory responses to QMP.
• To elucidate the peripheral mechanisms underlying QMP attraction and avoidance in worker bees.

Main Methods:

• Behavioral assays measuring contact and avoidance of QMP in young and older worker bees.
• Gene expression analysis of dopamine and octopamine receptors in bee antennae.
• Correlation of receptor gene expression levels with behavioral responses to QMP.

Main Results:

• Young worker bees avoid QMP unless exposed during a critical early adult period.
• Early QMP exposure alters the expression of dopamine receptor genes (Amdop1, AmDOP3) and octopamine receptor gene (Amoa1) in antennae.
• Age-related decline in QMP attraction correlates with decreased expression of the QMP-activated receptor AmDOP3.

Conclusions:

• QMP attraction is not innate but learned during a sensitive window in early adult life.
• Peripheral regulation at antennal sensory neurons modulates QMP responses, suppressing avoidance and enhancing attraction.
• These findings provide a novel framework for understanding queen-worker communication and social cohesion in honeybees.