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RELATIVE SUSCEPTIBILITY TO ARSENIC IN SUCCESSIVE INSTARS OF THE SILKWORM.
1Entomological Laboratory of the Bussey Institution, Harvard University, Boston.
The Journal of General Physiology
|October 30, 2009
Summary
Silkworm susceptibility to arsenic decreases as they grow. This change in arsenic toxicity can be measured using dosage-effect curves, providing a numerical value for relative susceptibility.
Area of Science:
- Environmental toxicology
- Insect toxicology
- Developmental biology
Background:
- Arsenic is a toxic metalloid with significant environmental impact.
- Understanding toxicological responses in key insect species is crucial for ecological risk assessment.
- Silkworms (Bombyx mori) are important model organisms in entomology and sericulture.
Purpose of the Study:
- To investigate the developmental changes in silkworm susceptibility to arsenic.
- To establish a quantitative method for expressing relative arsenic susceptibility in silkworms.
Main Methods:
- Dosage-effect curves were generated for arsenic exposure at different larval developmental stages.
- Areas under the dosage-effect curves were calculated.
- A ratio of these areas was used to express relative susceptibility.
Main Results:
- Silkworm susceptibility to arsenic significantly decreases with advanced larval development.
- The ratio of areas under dosage-effect curves provides a quantifiable measure of this decreasing susceptibility.
- This indicates a developmental resistance to arsenic toxicity in silkworms.
Conclusions:
- Silkworm larval development confers a natural resistance to arsenic toxicity.
- The quantitative method using dosage-effect curve ratios is effective for assessing developmental changes in toxicological susceptibility.
- Findings have implications for understanding arsenic bioavailability and detoxification mechanisms in insects.
