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SUBUNIT COORDINATION IN THE FIREFLY LIGHT ORGAN.

Frank E Hanson, Jeffrey Miller, George T Reynolds

    The Biological Bulletin
    |April 4, 2017
    PubMed
    Summary
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    Firefly light organs flash in unison, but individual "microsources" within them activate asynchronously. These microsources, likely 2-3 photocytes, represent the smallest functional unit of light emission in fireflies.

    Area of Science:

    • * Biophysics
    • * Insect Physiology
    • * Luminescence

    Background:

    • * Firefly bioluminescence is a complex physiological process.
    • * Previous research has focused on the overall flash patterns, with less understanding of the underlying cellular mechanisms.
    • * The Photuris firefly species was chosen for its distinct light-producing capabilities.

    Purpose of the Study:

    • * To investigate the temporal and spatial dynamics of light emission within the firefly light organ at a micro-level.
    • * To identify the smallest functional unit responsible for light production.
    • * To correlate histological structures with observed light emission patterns.

    Main Methods:

    • * High-speed cinematography (64 frames/sec) using an image intensifier to capture microphotographs of firefly light organs.

    Related Experiment Videos

  • * Analysis of recorded film to assess flash synchrony and asynchrony.
  • * Histological examination of light organ tissues for cellular identification.

    • Main Results:

    • * Firefly light organs typically flash simultaneously, with occasional minor delays (32-48 msec) between organs.
    • * Individual flashes consist of numerous small light-emitting spots ("microsources") that activate asynchronously.
    • * Microsources (average diameter 21.6 µm) are identified as the functional units, likely comprising 2-3 adjacent photocytes, which are the light-emitting cells within the organ's rosettes.

    Conclusions:

    • * The firefly light organ functions as an integrated system of numerous, independently operating microsources.
    • * The microsource represents the fundamental physiological unit of light emission in fireflies.
    • * Understanding these micro-dynamics provides insight into the cellular basis of bioluminescence.