The wing melanization with 20-hydroxyecdysone modulation in Idea leuconoe clara (Lepidoptera: Nymphalidae)

Area of Science:

• Zoology
• Entomology
• Physiological Ecology

Background:

• Temperature influences physiological signals and wing coloration in Lepidoptera.
• The hormone 20-hydroxyecdysone (20E) regulates seasonal morphs in response to temperature.
• Melanization in Idea leuconoe clara can be induced by temperature shock, but its hormonal basis is unknown.

Purpose of the Study:

• To investigate the hypothesis that the melanic phenotype of Idea leuconoe clara is affected by distinct hormonal responses under extreme temperatures.
• To explore the relationship between 20-hydroxyecdysone (20E) and temperature-induced melanization in Idea leuconoe clara.

Main Methods:

• Measuring 20-hydroxyecdysone (20E) levels at specific pupal development stages (3% and 20%) under temperature shock.
• Investigating the relationship between 20E and melanization through hormone injection experiments.

Main Results:

• A negative relationship was observed between melanization under cold shock and 20E levels.
• 20-hydroxyecdysone (20E) was found to regulate the degree of melanin deposition, not the patterning of melanized areas.

Conclusions:

• The study demonstrates the effect of 20E on wing melanization under extreme temperatures in Idea leuconoe clara.
• Future research could utilize transcriptomic analysis and scanning electron microscopy to further elucidate melanic changes.