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Related Experiment Videos

The role of

Tanaka1

  • 1Department of Insect Physiology and Behavior, National Institute of Sericultural and Entomological Science, Tsukuba, 305-8634, Ibaraki, Japan

Journal of Insect Physiology
|May 20, 2000
PubMed
Summary
This summary is machine-generated.

The study shows that [His(7)]-corazonin influences body color in Locusta migratoria. Timing and dosage of this peptide impact pigment development in both albino and normal locust strains.

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Area of Science:

  • Insect physiology
  • Endocrinology
  • Developmental biology

Background:

  • Locusta migratoria exhibits distinct body coloration patterns.
  • Hormonal regulation plays a crucial role in insect development and morphology.
  • Corazonin is a neuropeptide with known physiological functions in insects.

Purpose of the Study:

  • To investigate the effect of [His(7)]-corazonin on body color expression in Locusta migratoria.
  • To determine the influence of injected dose and timing of [His(7)]-corazonin administration on pigmentation.
  • To compare the effects in both albino and normal (pigmented) strains of Locusta migratoria.

Main Methods:

  • Administration of varying doses (1pmol, 100pmol, 1nmol) of [His(7)]-corazonin to Locusta migratoria nymphs at different developmental stages (early, middle, late third instar).

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  • Observation and documentation of body color changes in subsequent instars (fourth and fifth) after injection.
  • Comparison of pigmentation responses between an albino strain and a normal pigmented strain.

    • Main Results:

    • High-dose [His(7)]-corazonin injection in albino nymphs induced significant black pigmentation, with coloration varying based on injection timing.
    • Specific injection timings in albino nymphs led to patterns mimicking gregarious locusts.
    • In normal strain nymphs, higher doses of [His(7)]-corazonin also promoted black coloration, while lower doses had minimal effect.
    • Most treated individuals, regardless of initial response, developed black coloration by the fifth instar.

    Conclusions:

    • The temporal dynamics of [His(7)]-corazonin hemolymph levels are critical for regulating body color expression in Locusta migratoria.
    • [His(7)]-corazonin acts as a key hormonal factor influencing melanization and pigment development.
    • This peptide's dosage and precise timing of action are essential for specific color pattern formation in locusts.